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rp506k series 2a *1 pwm/vfm s t ep- dow n dc/ dc conv ert er with sync hr onous rect ifier no.ea-2 96-1 2052 5 1 outline the rp506k series are low supply current cmos-b ased pwm/vfm step-down dc/ dc converters with synchronous rectifier featuring 2a *1 output current. internally, a single ic consists of an oscillator, a reference voltage unit, an error amplifier, a switching control circuit, a mode control circuit, a soft start circuit, a latch protection circuit, an under-voltage lockout (uvlo) circuit, a thermal shutdown circuit, and switching transistors. by simply using an indu cto r and ca p a cit ors a s extern al compo nent s, without con nectin g any diode, a low rip ple and high efficiency synchronous rectifier step-down dc/ dc converter can be easily configured. rp506k is available in dfn(plp)2527-10 package whic h achieves high-density mounting on boards. rp506k is available in the fixed output voltage type (rp506kxx1a/ b/ d/ e) which can be set by 0.1 v step and the output voltage accuracy is as high as 1.5% or 18mv, or the adjustable output voltage type (rp506k001c/ f) which can be set by using the external resistors. the oscillator frequency can be selected from 2.25mhz (r p506kxx1a/ b/ c) or 1.2m hz (rp506k001c/ f). by inputting a signal to mode pin, rp506k can choose pwm/ vfm auto switching control or forced pwm control. in low output current, pwm/vfm auto switching control autom atically switches from pwm mode to vfm mode in order to achieve high efficiency. likewise, in low output current, fixed pwm control switches at fixed frequency in order to reduce noise. rp506k contains a latch type protection circuit which latches the built-in driver to the off state during high load or if the output is short-circuited for a specified time (protection delay time). the latch protection circuit can be released by once setting the ic into the standby mode wi th the ce pin and then setting it back to the active mode, or, by turning the power off and back on. se tting the supply voltage lower than the uvlo detector threshold can also release the latch protection circuit. rp506k also contains a thermal shutdown circuit which detects overheating of the regulator if the output pin (v out ) is shorted to the ground pin (gnd) etc. and stops regulator operation to protect it from damage. the soft-start time is fixed within the ic (typ. 150s), but it is also adjustable by using external capacitors. rp506k includes a power good (pg) function which monitors the v out pin volt a ge or the fee dba ck pin vol t ag e (v fb ), and switches the pg pin to low if any abnormal condition is detected. *1 t h is is an ap pro x imat e valu e. t he output current de pe nds on cond it io ns and e x ter n a l compo nent s. http://
rp506 k 2 features supply current typ. 48a (vfm mode, lx at no load) standby current max. 5a input voltage range 2.5v to 5.5v (absolute maximum ratings: 6.5v) output voltage rang e 0.8v to 3.3v *2 (rp506kxx1a/ b/ c) 0 . 6 v t o 3 . 3 v *2 (rp506kxx1d/ e/ f) output voltage ac curacy 1.5%(v set *3 1.2v), 18mv(v se t < 1 .2v) (rp506kxx1a/ b/ d/ e) t feedback voltage ac curacy 9mv(v fb =0.6v) (rp506k001c/ f) output v o lt ag e/ feedba ck v o lt age temperature coeffi cient 100ppm/ oc oscillator frequency typ. 2.25mhz (r p506kxx1a/ b/ c) t y p . 1 . 2 m h z ( r p 5 0 6 k x x 1 d / e / f ) oscillator maximum duty min. 100% built-in driver on resistance typ. pch. 0.130 ? , nch. 0.125 ? (v in =3.6v) uvlo detector thre shold typ. 2.2v inductor current limit circuit current limit typ. 2.8a latch type protection circuit typ. 1.5ms package dfn(plp)2527 ? 10 *2 please refer to electrical characteristics for more information. fixed output voltage type (rp506kxx1a/ b/ d/ e) can be set by 0.1 v step. *3 v set =set output voltage application powe r so urce for li-ion b attery-u se d equi pment power source for portable communication equipment, camcorder, dsc, notebook pc powe r so ur ce for hd d, wl an
rp506 k 3 block diagram rp506kxx1a/d ce pv in ag nd l x chip enable ramp com p ensation current feedback current detector switching control uvlo osc vref v out mode control soft start pgnd mode thermal protection av in t ss (?l ? du r i ng so ft s t a r t ) pg o v er / u nder v olt age detec t ion ov d uvd rp506kxx1b/e ce pv in ag nd l x chip enable ramp com p ensation current feedback current detector switching control uvlo osc vref v out mode control soft start pgnd mode thermal protection av in t ss (?l ? du r i ng so ft s t a r t ) pg o v er / u nder v olt age detec t ion ov d uvd
rp506 k 4 rp506k001c/f ce pv in ag nd l x chip enable ramp com p ensation current feedback current detecto r switching control uvlo osc vref v fb mode control s o ft s ta r t pgnd mode thermal protection av in t ss ( ? l ? du r i ng sof t s t ar t) pg over / u nd er v ol t ag e det e c t i o n ov d uvd selection guide the set o u tpu t voltage, the output volt ag e type, the auto-disch a rge functio n *4 , and the oscill ator frequen cy for the ics a r e use r -sel ect able optio ns. product na me package quantity per reel pb free halogen free rp506kxx1$(y)-tr dfn(plp)2527 ? 10 5,000 pcs yes yes xx: designation of the set output voltage (v set ) for fixed output voltage type: 0.6v (06) *5 to 3.3v (33) in 0.1v steps *6 for adjustable output voltage type: 0.6v (001) only (y ): if v set includes the 3rd digit, indicate the digit of 0.01v. ( 1 . 2 5 v ) ex. i f v set is 1.25v, rp506k121$5-tr-fe. $: desig nati on of versio n version output voltage type auto-dis charge function oscillator frequency a fixed no 2.25mhz b fixed yes 2.25mhz c adjustable no 2.25mhz d fixed no 1.2mhz e fixed yes 1.2mhz f adjustable no 1.2mhz *4 auto-disch ar ge functi on qui ckl y lo w e rs the output v o ltag e to 0v, w h e n t he ch ip e n a b le sign al is s w i t c hed from th e active mode to the standby mode, by releasing the elec trical charge accumulated in the external capacitor. *5 v set can be set only within the specified range of voltage. please refer to electrical characteristics for details. *6 0.05v step is also ava ila bl e as a custom co de.
rp506 k 5 pin configuration top view bottom view 1 2 3 4 5 10 9 8 7 6 10 9 8 7 6 1 2 3 4 5 pin description rp506 k: df n(plp ) 252 7-10 *7 pin no. symbol description 1 pv in pv in input voltage pin *8 2 av in av in input voltage pin *8 3 pg power good pin 4 ce chip enable pin (?h? active) 5 mode mode control pin (?h? forced pwm control, ?l? pw m/ vfm auto switching control) 6 t ss soft-start pin 7 v out / v fb output/ feedback voltage pin 8 agnd analog ground pin *9 9 l x switching pin 10 pgnd power ground pin *9 *7 t he tab on the bottom of the packag e en ha nces therma l p e rformanc e an d is electric all y conn ected to gnd (substarate level). it is recommended that the tab be conne cted to the ground plane on t he board. if not, the tab can be left open. *8 no.1 pin and no.2 pin must be wired to the v in plane when mounting on boards. *9 no.8 pin and no.10 pin must wired to the gnd plane when mounting on boards.
rp506 k 6 absolute maximum ratings ( a g n d = p g n d = 0 v ) symbol item rating unit v in av in / pv in pin voltage -0.3 to 6.5 v v lx l x pin voltage -0.3 to av in / pv in +0.3 v v ce ce pin voltage -0.3 to 6.5 v v out / v fb v out / v fb pin voltage -0.3 to 6.5 v v mode mode pin voltage -0.3 to 6.5 v v pg pg pin voltage -0.3 to 6.5 v v tss t ss pin voltage -0.3 to av in +0.3 v i lx l x pin output current 2.8 a 910 (standard land pattern *10 ) mw p d power dissipation *10 (dfn2527-10) 1400 (high wattage land pattern *10 ) mw t t a operating temperature range -40 to +85 oc t t stg storage temperature range -55 to +125 oc * 10 for more information about power dissipation, standard land pattern and high wattage land pattern, please refer to package information . absolute maximum ratings electronic and mechanical stress momentarily exc eeded absolute maximum ratings may cause the permanent damages and may degrade the lifetime and safety for both device and system using the device in the field. the functional operation at or over these abso lute maximum ratings is not assured. recommended operating conditions (electrical characteristics) all of electro n i c equi pme n t shou ld b e desi gne d that the mounted s e micon ductor d e vices o per ate w i th in the recommended operating conditions. the semiconductor devic es cannot operate normally over the recommended operating conditions, even if when they are used over such conditions by mom entary electronic noise or surge. and the semiconductor devices may receive serious damage when they continue to operate over the recommended operating conditions.
rp506 k 7 electrical characteristics rp506kxx1 (ta=25oc) symbol item conditions min. typ. max. unit istandby standby current av in / pv in =5.5v, v ce =0v 0 5 a i ceh ce ?h? input current av in / pv in =v ce =5.5v -1 0 1 a i cel ce ?l? input current av in / pv in =5.5v, v ce =0v -1 0 1 a i modeh mode ?h? input current av in / pv in =v mode =5.5v, v ce =0v -1 0 1 a i model mode ?l? input current av in / pv in =5.5v, v ce =v mode =0v -1 0 1 a i lxleakh l x leakage current ?h? av in / pv in =v lx =5.5v, v ce =0v -1 0 6 a i lxleakl l x leakage current ?l? av in / pv in =5.5v, v ce =v lx =0v -6 0 1 a v ceh ce ?h? input voltage av in / pv in =5.5v 1.0 v v cel ce ?l? input voltage av in / pv in =2.5v 0.4 v v modeh mode ?h? input voltage av in / pv in =5.5v 1.0 v v model mode ?l? input voltage av in / pv in =2.5v 0.4 v r onp on resistance of pch transistor av in / pv in =3.6v, i lx =-100ma 0.130 ? r onn on resistance of nch transistor av in / pv in =3.6v, i lx =-100ma 0.125 ? maxduty oscillator maximum duty cycle 100 % tstart1 soft-start time 1 av in / pv in =v ce =3.6v or v set +1v , t ss =open 150 300 s tstart2 soft-start time 2 av in / pv in =v ce =3.6v or v set +1v , c ss =0.1 f 15 30 45 ms i lxlim l x current limit av in / pv in =v ce =3.6v or v set +1v 2300 2800 ma tprot protection delay time av in / pv in =v ce =3.6v or v set +1v 0.5 1.5 5 ms v uvlo1 uvlo detector threshold av in / pv in =v ce 2.1 2.2 2.3 v v uvlo2 uvlo released voltage av in / pv in =v ce 2.2 2.3 2.4 v t tsd thermal shutdown temperature junction temperature 150 oc t tsr therm al shut down rel eased temperature junction temperature 100 oc r pg on re si stan ce of pg pin when low output av in / pv in =3.6v, v out =0v or v fb =0v 45 ? ? rp506kxx1a/ b/ c (oscillator frequency: 2.25mhz) 1.1v v set <1.2v 2.5 4.5 when mode=h operating input voltage *11 1.2v v set 2.5 5.5 0.8v v set <1.0v 2.5 4.5 v in when mode=l operating input voltage 1.0v v set 2.5 5.5 v fosc oscillator frequency av in / pv in =v ce =3.6v or v set +1v 2.00 2.25 2.50 mhz ? rp506kxx1d/ e/ f (oscillator frequency: 1.2mhz) 0.6v v set <0.7v 2.5 4.5 when mode=h operating inp u t voltage 0.7v v set 2.5 5.5 v in when mode=l operating input voltage 2.5 5.5 v f osc oscillator frequency av in / pv in =v ce =3.6v or v set +1v 1.00 1.20 1.40 mhz
rp506 k 8 symbol item conditions min. typ. max. unit rp506kxx1a/ b/ d/ e (fixed output voltage type) v set 1.2v x -1.015 x 1.015 v out output voltage av in / pv in =v ce =3.6v or v set +1v v set <1.2v -0.018 +0.018 v v out / t output voltag e tempe r atu r e coefficient ? 40 c t t a 85 c 100 ppm/oc i dd1 supply current 1 av in / pv in =v ce =5.5v, v out =v set 0.8 600 a v mode =0v 48 72 a i dd2 supply current 2 av in / pv in =v ce =v out =5.5v v mode =5.5v 600 a i voutl v out ?l? current av in / pv in =5.5v, v ce =v out =0v -1 0 1 a v ovd ovd voltage av in / pv in =3.6v v set 1.2 v v uvd uvd voltage av in / pv in =3.6v v set 0.8 v ? rp506kxx1a/ d (fixed output voltage type without auto-discharge function) i vouth v out ?h? current av in / pv in =v out =5.5v, v ce =0v -1 0 1 a ? rp506kxx1b/ e (fixed output voltage type with auto-discharge function) r low on resistance of low output av in / pv in =3.6v, v ce =0v 45 ? rp506k001c/ f (adjustable output voltage type) v fb feedback voltage av in / pv in =v ce =3.6v 0.591 0.600 0.609 v v fb / t feedb ack vol t age temperature coefficient ? 40 c t t a 85 c 100 ppm/oc i dd1 supply current 1 av in / pv in =v ce =5.5v, v fb =0.48v 600 a v mode =0v 48 72 a i dd2 supply current 2 av in / pv in =v ce =v fb =5.5v v mode =5.5v 600 a i vfbh v fb ?h? current av in / pv in =v fb =5.5v, v ce =0v -1 0 1 a i vfbl v fb ?l? current av in / pv in =5.5v, v ce =v fb =0v -1 0 1 a v ovd ovd voltage av in / pv in =3.6v 0.72 v v uvd uvd voltage av in / pv in =3.6v 0.48 v all test items listed under electrical characteristics are done under the pulse load condition (tj ta=25oc) except output voltage temperature coefficient and feedback voltage temperature coefficient. *11 as for rp506kxx1a/ b/ c (mode=h), v set can be set from 1 . 1v.
rp506 k 9 typical application rp506kxx1a/ b/ d/ e (fixed output voltage type) with pg function, 30ms soft-start time pv in pg pg n d l x v out agnd v in c out 30uf v ou t l1 2.2uh rp 506 k se r i es ce t ss mode *12 r pg 100k c in 10uf pg a v in c ss 0.1uf *12 mode=?h? forced pwm control mode=?l? pwm/ vfm auto switching control rp506k001c/ f (adjustable output voltage type) without pg function, 150s soft-start-time pv in pg pgn d l x v fb agnd v in c out 30uf v ou t l2 2.2uh rp 5 06k ser i es a v in ce t ss mode *1 2 c in 10uf r1 r2 c1 *12 mode=?h? forced pwm control mode=?l? pwm/ vfm auto switching control table 1. recommended external components symbol size part description model c1608jb0j106m (tdk) c in 10 f ceramic capacitor jmk107bj106ma (taiyo yuden) 22 f x 2 ceramic capacitor c2012jb0j226m (tdk) c1608jb0j106m (tdk) c out 10 f x 3 ceramic capacitor jmk107bj106ma (taiyo yuden) slf6045t-2r2n3r3 (tdk) clf6045-2r2n (tdk) fdsd0415-2r2m (toko) l 2.2 h inductor rlf7030t-2r2m5r4 (tdk)
rp506 k 10 technical notes when using rp506k series, please consider the following points. agnd and p g nd mu st be wired to the gnd plan e when mou n ting on boards. av in and pv in must be wired to the v in plane when mo unting on b oa r ds. ensure the av in / pv in and agnd/ pgnd lines are sufficiently robu st. a large switching current flows through the agnd/ pgnd line, the v dd line, the v out line, an inductor, and l x . if their impedance is too high, noise pickup or unstable operation may result. set the external components as close as possible to the ic and minimize the wiring between the components and the ic. especially, place a capacitor (c in ) as close as possible to the pv in pin and pgnd. for rp506kxx1a/ b/ d/ e, separate the wiring between the v out pin and an inductor (l1) from the wiring between l1 and load. likewise, for rp506k001c/ f, separate the wiring between a resistor for setting output voltage (r1) and an inductor (l2) from the wiring between l2 and load. choose a low esr ceramic capacitor. the ceramic capacitance of c in should be more than or equal to 10f. for a ceramic capacitor (c out ), it is recommended that three paralleled 10f ceramic capacitors or two paralleled 22f ceramic capacitors be used. choose a 2.2h inductor. the phase compensation of this ic is designed according to the c out and l values. choose an inductor that has small dc resistance , has enough allowable current and is hard to cause magnetic saturation. if the inductance value of an in ductor is extremely small, the peak current of l x may increase along with the load current. as a result, over current protection circuit may start to operate when the peak current of l x reaches to ?l x limit current?. over current protection circuit an d latch type protection circuit may be affected by self-heating or power dissipation environment. the output voltage (v out ) is adjustable by changing the resistance va lues of resistors (r1, r2) as follows. v out = v fb (r1 + r2) / r2 (recommended v out range for RP506K001F: 0.6v v set 3.3v) (recommended v out range for rp506k001c: 0.8v v set 3.3v) if r1 and r2 are too large, the impedances of v fb also become large, as a result, the ic could be easily affected by noise. for this reason, r2 should be 220k ? or less. if the operation becomes unstable dues to the high impedances, the impeda nces should be decreased. c1 can be calculated by the following equations. pl ease use the value close to the calculation result. c1 = 4.84 10 -6 / r 2 [f] the recommended resistance values for r1 and c1 when r 2 =220k ? are as follows. v set [v] 0.6 0.7 0.8 1.2 1.8 2.5 3.3 r1 [k ? ] 0 36.7 73.3 220 440 697 990 r2 [k ? ] 220 220 220 220 220 220 220 c1 [pf] - 22 22 22 22 22 22 soft-start time (tstart) is adjustable by connecting a capacitor (c ss ) between the t ss pin and gnd. the capacitance value for c ss that is suitable for tstart can be calculated by the following equation. c ss (nf) = 3.5 ts ta r t ( m s ) the t ss pin must be open if soft-start time function is not used. soft-start time is set to typically 150s when the t ss pin is open. when using the power good function, the resistance value of a resistor (r pg ) should be between 10k ? to 100k ? . the pg pin must be open or connected to gnd if the power good function is not used. for stable operation, please use recommended exter nal components with recommended sizes indicated in table 1. recommended external components . however, performances of power source circuits using rp506k largely depend on peripheral circuits. when selecting the peripheral components, please consider the conditions of use. do not allow each component, pc b pattern or the ic to exceed their respected rated values (voltage, current, and power) when designing the peripheral circuits.
rp506 k 11 soft start time adjusta ble function and po wer good function soft-start time adjustable function soft-start time (tstart) of rp506k series is adjustable by connecting a soft-start time adjustable capacitor (c ss ) between the t ss pin and gnd. tstart can be set from typ. 0.15m s. as the diagram below shows, if 0.1f c ss is connected, tstart will be 30ms. the t ss pin must be open if the soft-start time function is not used. tstart is set to 0.15ms (typ.) when the t ss pin is open. ts ta r t 30m s 15m s 3ms 0.15 ms 0 4 70pf 0.01 f 0.047 f 0.1 f c ss c ss vs. tstart (typ.) power good function rp506k se ri es cont ain s a power g ood function usi n g nc h o pen d r ain. if any a bnormal con d i tion is d e tect ed, the power g o od functio n turn s nch tra nsi stor o n an d swit che s th e pg pin to low . if the ca use of the a b norm a l con d ition i s removed, the power g ood f unctio n turn s nch tra nsi st or of f an d switche s the p g pin b ack t o high. af ter the re covery from a bnormal con d ition, it t a ke s typi cally 0.1ms fo r the i c to turns nch tran sisto r of f. the followin g s a r e the abnormal conditio n s th at the powe r good fun c tion can dete c t. ? c e =? l? ( s hu t d o w n) ? uvl o (shu t down) ? the r mal s hut do wn ? over voltage detection: typ . v set x 1.2v (rp506kxx1a/ b/ d/ e) or 0.72v (rp506k001c/ f) ? under voltage detection: typ . v set x 0.8v (rp506kxx1a/ b/ d/ e) or 0.48v (rp506k001c/ f) when using the power good function, the resistance of pg pin (r pg ) should be between 10k ? to 100k ? . the pg pin must be open or connected to gnd if the power good function is not used.
rp506 k 12 start-up sequence using soft-st art time adjustable function and power good function start-up sequence of rp506k series can be built by us ing soft-start time adjustable function and power good function. the diagram belo w sho w s an example of circuit s with sta r t-up sequ ence using dc/ dc1 and dc/ dc2. in the circuit s with st art-u p se que nce, by se ndi ng the pg sig nal to the ce pin of dc/ dc2, dc/ dc1 st art s up first and then dc/ dc2 st a r t s u p af ter . circuit s exa m ple w i th s t art-up seque nce dc/ d c 1 ( r p 506 k00 1c/f ) : v in =5.0v, v out =1.8v, tstart=30ms (c ss =0.1 f) dc/ dc2 (rp506k001c/f): v in =5.0v, v out =1.2v, tstart=30ms (c ss =0.1 f) pv in pg pg n d l x v fb ag n d v in =5 .0 v c out1 30f v ou t 1 1.8 v l 1 2.2h r p 50 6k 00 1c /f a v in ce t ss mo d e r pg 1 10 0k ? c in 1 10 h 44 0k ? 22pf pv in pg pg n d l x v fb ag n d c ou t 2 30 f v ou t 2 1.2 v l 2 2.2h r p 50 6k 00 1c /f a v in ce t ss mo d e c in 2 10 h 22pf d c/ dc1 dc / d c2 22 0k ? 22 0k ? 22 0k ? c ss1 0. 1 f c ss2 0. 1f
rp506 k 13 operation of step-down dc / dc converter and outptut current the step-down dc/ dc converter charges energy in the inductor when l x tr. turns ?on?, and discharges the energy from the inductor when l x tr. turns ?off? and operates with less energy loss, so that a lower output voltage (v out ) than the input voltage (v in ) can b e obt ained. the ope ratio n of the step-down dc/ dc conver te r is explained in t he followi ng d i agra m s. diag. 1 basic circuit diag. 2 inductor cu rre n t (il) flo w i n g throug h inducto r (l) pc h t r l nch tr v in i1 v out cl i2 gnd t 1/fosc ton t of f topen ilm i n ilm a x il i1 i2 step1. pch tr. turns ?on? and il (i1) flows, l is charge d with energy. at this moment, i1 increases from the minimum inductor current (ilmin), which is 0a, an d reaches the maximum inductor current (ilmax) in proportion to the on-time period (ton) of pch tr. step2. when pch tr. turns ?off?, l tries to maintain il at ilmax, so l turns nch tr. ?on? and il (i2) flows into l. s t ep3. i2 decrea s e s grad ually and rea c he s ilmi n af ter the op en-time p erio d (topen ) of nch t r ., and th en nch t r . turns ?off?. this is called discontinuous current mode. as the output current (i out ) increases, the off-time period (toff) of pch tr. runs out before il reaches ilmin. the next cycle starts, and pch tr. turns ?on? and nch tr. turns ?off?, which means il starts increasing from ilmin. this is called continuous current mode. in the case of pwm control system, v out is maintained by controlling ton. during pwm control, the oscillator frequency (fosc) is being maintained constant. as shown in diag. 2, when the step-down dc/ dc operat ion is constant, ilmin and ilmax during ton of pch tr. would be same as during toff of pch tr. the current differential between ilmax and ilmin is described as i. i = ilmax ? ilmin = v out topen / l = (v in ? v out ) ton / l equation 1 however, t = 1 / fosc ? = ton + toff duty (%)= ton / t 100 = ton fosc 100 topen toff in equation 1, ?v out topen / l? shows the amount of current change in "on" state. also, ?(v in ? v out ) ton / l? shows the amount of current change at "off" state.
rp506 k 14 discon t inuo us mode and continu ous mode as illustrated in diag 3., when i out is relatively small, topen0. this is called continuous mode. diag 3. discontinuous mode diag 4. continuous mode ilm a x ilm i n ton toff t=1/fosc tope n il t ilm a x ilm i n ton toff t=1/fosc il iconst t in the continuous mode, the solution of equation 1 is described as tonc. tonc = t v / v equat ion 2 t out in when ton rp506 k 15 forced pwm mode by setting the mode pin to ?h?, the ic switches the fr equency at the fixed rate to reduce noise even when the output load is light. therefore, when i out is ? il/2 or less, ilmin becomes less than 0. that is, the accumulated electricity in cl is discharged through the ic side while il is increasing from ilmin to 0 during ton, and also while il is decreasing from 0 to ilmin during toff. forced pwm mode ilm a x ilm i n ton toff t=1/fosc il i out t 0 il vfm mode by setting the mode pin to ?l?, in low output current, t he ic automatically switches into vfm mode in order to achieve high efficiency. in vfm mode, ton is forced to end when the inductor current reaches the pre-set ilmax. in the vfm mode, ilmax is typically set to 400ma fo r rp506kxx1a/ b/ c, and 550ma for rp506kxx1d/ e/ f. when ton reaches 1.5 times of t=1/fosc , ton will be forced to end even if the inductor current is not reached ilmax . vfm mode ilm a x ilm i n ton toff il t 0
rp506 k 16 output current and selection of external components the following equations explain the relationship bet ween output current and peripheral components used in the diagram in ? typical applications ? (p.9). ripple current p-p value is described as i rp , on resistance of pch tr. is described as r onp , on resistance of nch tr. is described as r onn , and dc resistor of the inductor is described as r l . first, when pch tr. is ?on?, the following equation is satisfied. v in = v out + (r onp + r l ) i out + l i rp / ton equation 3 second, when pch tr. is "off" (nch tr. is "on"), the following equation is satisfied. l i rp / toff = r onn i out + v out + r l i out equat ion 4 put equation 4 into equation 3 to solve on duty of pch tr. (d on = ton / (toff + ton)): d on = (v out + r onn i out + r l i out )/(v in + r onn i out ? r onp i out ) equation 5 ripple current is described as follows: i rp = (v in ? v out ? r onp i out ? r l i out ) d on / fosc / l equat ion 6 peak current that flows through l, and l x tr. is described as follows: ilxmax = i out + i rp / 2e quation 7 please consider ilxmax when setting conditions of input and output, as well as selecting the external components. the above calculation formulas are based on the ideal operation of the ics in continuous mode.
rp506 k 17 timing chart (1) soft-start time starting-up with ce pin the ic starts to operate when the ce pin voltage (v ce ) exceeds the threshold voltage. the threshold voltage is preset between ce ?h? input voltage (v ceh ) and ce ?l? input voltage (v cel ). v ceh soft-start time i c i n t ernal ref erenc e v ol t age v ce l threshold level lx voltage (v ce ) (v ref ) s o ft - s ta rt ci rc u i t operation starts. (v lx ) dependi ng on p ow er s uppl y , load current , e x t ernal co m ponen t s (v out ) output voltage ce p i n i npu t v ol t age i c operat es w i t h p w m m ode duri ng s of t - s t ar t t i m e . sof t -st a rt time st a r t s whe n sof t -st a rt ci rcuit is a c tiva ted, and end s wh en the referen c e volt age re ache s the spe c ified volt age. sof t st art time is not always equal to the turn-on s peed of the step-do wn dc/ dc conve r ter . please note that the turn -on speed co uld be af fe ct ed by the po wer su pply cap a city , t he o u tput cu rrent, the indu ct an ce value and the c out value. s t arting-up w i th po w e r supply after the power-on, when v in exceeds the uvlo released voltage (v uvlo2 ), the ic starts to operate. then, soft-start circuit starts to operate and after a certain period of time, v ref gradu ally increa se s up to the sp ecified value. soft-start time starts when soft-start circuit is activated, and ends when v ref reache s the spe c ified volt age. out put v ol t age (v ou t ) i nput v o l t age (v in ) v uv lo 2 i c i n t ernal ref erenc e v ol t age (v re f ) v uv lo 1 lx v ol t age (v lx ) v set v set dependi ng on p ow er s uppl y , loa d current , e x t ernal com ponent s s o ft - s ta rt t i m e ic operates with pwm mode during soft-start time. please note that the turn-on speed of v out could be affected by the power s upply capacity, the output current, the inductance value, the c out value and the turn-on speed of v in determined by c in .
rp506 k 18 (2) under voltage lockout (uvlo) circuit if v in becomes lower than v set , the step-down dc/ dc converter stops the switching operation and on duty becomes 100%, and then v out gradually drops according to v in . if the v in drops more and becomes lower than the uvlo detector threshold (v uvlo1 ), the uvlo circuit starts to operate, v ref stops, and pch and nch built-in switch transistors turn ?off?. as a result, v out drops according to the c out capacitance value and the load. to restart the operation, v in needs to be higher than v uvlo2 . the timing chart below shows the voltage shifts of v ref , v lx and v out when v in value is varied. output voltage (v out ) i nput v o l t age (v in ) v uv lo 2 i c i n t ernal ref erenc e v ol t age (v re f ) v uv lo 1 lx v ol t age (v lx ) v set v set dependi ng on p ow er s uppl y , loa d current , e x t ernal com ponent s soft-start time falling edge (operating) and rising edge (releasing) waveforms of v out could be affected by the initial voltage of c out and the output current of v out .
rp506 k 19 (3) over current protection circuit, latch type protection circuit over current protection circuit superv ises the inductor peak current (the peak current flowing through pch tr.) in each switching cycle, and if the current exceeds the l x current limit (i lxlim ), it turns off pch tr. i lxlim of the rp506k is set to typ.2800ma. latch type protection circuit latches the built-in driv er to the off state and stops the operation of the step-down dc/ dc converter if the ov er current status continues or v out continues being the half of the setting voltage for equal or longer than protection delay time (tprot). notes: i lxlim and tprot could be easily affected by self -heating or ambient environment. if the v in drops dramatically or becomes unstable due to short-circ uit, protection operation and tprot could be affected. p r ot ect i on delay t i m e ( t prot ) lx limit current (i lxlim ) il flow in g t h r o u g h l cur r en t f l ow i ng t hrough p c h t r . l x v ol t age (v lx ) to release the latch type protection circuit, restart the ic by inputting "l" signal to the ce pin, or restart the ic with power-on or make the supply voltage lower than v uvlo1 . the timing chart below shows the voltage shift of v ce , v lx and v out when the ic status is changed by the following orders: v in rising stable operation high load ce reset stable operation v in falling v in recovering stable operation. (1) if the large current flows through the circuit or the ic goes into low v out condition due to short-circuit or other reasons, the latch type protection circuit latches the built-in driver to ?off? state after tprot. then, v lx becomes "l" and v out turns ?off?. in this timing chart below, the latch protection circuit is released by once setting the ic into "l" with the ce pin and then setting it back to "h". (2) the latch type protection is released by uvlo reset, which makes v in lower than v uvlo1 . i n p u t v o lt age (v in ) v se t uvlo detector thresholds (v uvlo1 ) ce p i n inpu t v ol t age (v ce ) v se t t hres hol d l evel l x v ol t age (v lx ) v se t o ut pu t v olt age (v ou t ) uvlo r e l e a s e d v o l t ag e ( v uv l o 2 ) (1) ( 2) soft-start time v se t soft-start time soft-start time stable operation protection delay time protection delay time uv lo res e t ce reset latch-type protection latch-type protection s t abl e ope r at i o n stable operation
rp506 k 20 typical performanc e characteristics 1) output voltage vs. output current rp506 kx x1 a/b/c v out =1.2v rp506kxx1a/b/c v out =1.2v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol 1.180 1. 185 1. 190 1. 195 1. 200 1. 205 1. 210 1. 215 1. 220 0. 01 0. 1 1 10 100 1 000 1000 0 o ut put cur r en t i ou t (m a ) o u t put v o lt a g e v ou t (v) vin=3.6v vin=5.0v 1.180 1. 18 5 1. 19 0 1. 19 5 1. 20 0 1. 20 5 1. 21 0 1. 21 5 1. 22 0 0 200 400 600 800 1000 120 0 140 0 160 0 1 800 2 000 o u t p ut c ur r ent i ou t (m a ) o u t put v o lt a g e v ou t (v) vin=3.6v vin=5.0v rp506 kx x1 a/b/c v out =1.8v rp506kxx1a/b/c v out =1.8v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol 1.780 1. 785 1. 790 1. 795 1. 800 1. 805 1. 810 1. 815 1. 820 0. 01 0. 1 1 10 100 1 000 1000 0 o ut put cur r en t i ou t (m a ) o u t put v o lt a ge v ou t (v) vin=3.6v vin=5.0v 1.780 1. 78 5 1. 79 0 1. 79 5 1. 80 0 1. 80 5 1. 81 0 1. 81 5 1. 82 0 0 200 400 600 800 1000 120 0 140 0 160 0 1 800 2 000 o u t p ut c ur r ent i ou t (m a ) o u t put v o lt a ge v ou t (v) vin=3.6v vin=5.0v rp506 kx x1 a/b/c v out =3.3v rp506kxx1a/b/c v out =3.3v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol 3.260 3. 270 3. 280 3. 290 3. 300 3. 310 3. 320 3. 330 3. 340 3. 350 0. 01 0. 1 1 10 100 1 000 1000 0 o ut put cur r en t i ou t (m a ) o u t put v o lt a ge v ou t (v) vin=4.3v vin=5.0v 3.260 3. 27 0 3. 28 0 3. 29 0 3. 30 0 3. 31 0 3. 32 0 3. 33 0 3. 34 0 3. 35 0 0 200 400 600 800 1000 120 0 140 0 160 0 1 800 2 000 o u t p ut c ur r ent i ou t (m a ) o u t put v o lt a ge v ou t (v) vi n =4 .3 v vi n =5 .0 v
rp506 k 21 rp506kxx1d/e/f v out =0.6v rp506kxx1d/e/f v out =0.6v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol 0.580 0. 585 0. 590 0. 595 0. 600 0. 605 0. 610 0. 615 0. 620 0. 01 0. 1 1 10 100 1 000 1000 0 o ut put cur r en t i ou t (m a ) o ut put v o l t ag e v ou t (v ) vin=3.6v vin=4.5v 0.580 0. 58 5 0. 59 0 0. 59 5 0. 60 0 0. 60 5 0. 61 0 0. 61 5 0. 62 0 0 200 400 60 0 800 1000 1 200 1400 16 00 180 0 2 000 o u t p ut c ur r ent i ou t (m a ) o u t p u t v o lt age v ou t (v ) vi n =3 .6 v vi n =4 .5 v rp506 kx x1 d/e/f v out = 0 .8v rp506kxx1d/e/f v out =0.8v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol 0.780 0. 785 0. 790 0. 795 0. 800 0. 805 0. 810 0. 815 0. 820 0. 01 0. 1 1 10 100 1 000 1000 0 o ut put cur r en t i ou t (m a ) o u t p ut v o lt a g e v ou t (v) vin=3.6v vin=5.0v 0.780 0. 78 5 0. 79 0 0. 79 5 0. 80 0 0. 80 5 0. 81 0 0. 81 5 0. 82 0 0 200 400 600 800 1000 120 0 140 0 160 0 1 800 2 000 o u t p ut c ur r ent i ou t (m a ) o u t p ut v o lt a g e v ou t (v) vin=3.6v vin=5.0v rp506 kx x1 d/e/f v out = 1 .2v rp506kxx1d/e/f v out =1.2v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol 1.180 1. 185 1. 190 1. 195 1. 200 1. 205 1. 210 1. 215 1. 220 0. 01 0. 1 1 10 100 1 000 1000 0 o ut put cur r en t i ou t (m a ) o u t put v o lt a ge v ou t (v) vin=3.6v vin=5.0v 1.180 1. 18 5 1. 19 0 1. 19 5 1. 20 0 1. 20 5 1. 21 0 1. 21 5 1. 22 0 0 200 400 600 800 1000 120 0 140 0 160 0 1 800 2 000 o u t p ut c ur r ent i ou t (m a ) o u t put v o lt a ge v ou t (v) vin=3.6v vin=5.0v
rp506 k 22 rp506 kx x1 d/e/f v out = 1 .8v rp506kxx1d/e/f v out =1.8v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol 1.780 1. 785 1. 790 1. 795 1. 800 1. 805 1. 810 1. 815 1. 820 0. 01 0. 1 1 10 100 1 000 1000 0 o ut put cur r en t i ou t (m a ) o u t put v o lt a g e v ou t (v) vin=3.6v vin=5.0v 1.780 1. 78 5 1. 79 0 1. 79 5 1. 80 0 1. 80 5 1. 81 0 1. 81 5 1. 82 0 0 200 400 600 800 1000 120 0 140 0 160 0 1 800 2 000 o u t p ut c ur r ent i ou t (m a ) o u t put v o lt a g e v ou t (v) vin=3.6v vin=5.0v rp506 kx x1 d/e/f v out = 3 .3v rp506kxx1d/e/f v out =3.3v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol 3.260 3. 270 3. 280 3. 290 3. 300 3. 310 3. 320 3. 330 3. 340 3. 350 0. 01 0. 1 1 10 100 1 000 1000 0 o ut put cur r en t i ou t (m a ) o u t p ut v o lt a g e v ou t (v) vin=4.3v vin=5.0v 3.260 3. 27 0 3. 28 0 3. 29 0 3. 30 0 3. 31 0 3. 32 0 3. 33 0 3. 34 0 3. 35 0 0 200 400 600 800 1000 120 0 140 0 160 0 1 800 2 000 o u t p ut c ur r ent i ou t (m a ) o u t p ut v o lt a g e v ou t (v) vi n =4 .3 v vi n =5 .0 v 2) output voltage vs. input voltage rp506 kx x1 d/e/f v out = 0 .6v rp506kxx1d/e/f v out =0.8v mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 0.780 0. 785 0. 790 0. 795 0. 800 0. 805 0. 810 0. 815 0. 820 2 . 5 3 3 . 5 4 4 .5 5 5 .5 i n p u t v o lt age v in (v ) o u t p ut v o lt a ge v ou t (v ) iout=1ma iout=1000ma iout=2000ma 0.580 0. 585 0. 590 0. 595 0. 600 0. 605 0. 610 0. 615 0. 620 2 . 533 . 54 4 . 555 . 5 i nput v o lt age v in (v ) o u t p ut v o lt a ge v ou t (v ) iout=1m a iout=1000ma iout=2000ma
rp506 k 23 rp506k v out =1.2v rp506k v out =1.8v mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 1.180 1. 185 1. 190 1. 195 1. 200 1. 205 1. 210 1. 215 1. 220 2 .5 3 3 .5 4 4 .5 5 5 .5 i nput v o lt age v in (v ) o u tp u t v o l ta g e v ou t (v ) iout=1m a iout=1000ma iout=2000ma 1.780 1. 785 1. 790 1. 795 1. 800 1. 805 1. 810 1. 815 1. 820 2 . 53 3 . 544 . 5 5 5 . 5 i nput v o lt age v in (v ) o ut put v o l t ag e v ou t (v ) iout=1ma iout=1000ma iout=2000ma rp506k v out =3.3v mode =?h? forced p w m contr ol 3.260 3. 270 3. 280 3. 290 3. 300 3. 310 3. 320 3. 330 3. 340 3. 350 3. 8 4. 3 4. 8 5. 3 i npu t v o ltage v in (v ) o u t pu t v o l t ag e v ou t (v ) iout=1m a iout=1000ma iout=2000ma 3) ou tput vo ltage v s . ambient tempe ratur e 4) feedb ack voltag e v s . ambient tempera t ure rp506k181a/b/d/e v out =1.8v rp506k001c/f 1. 770 1. 780 1. 790 1. 800 1. 810 1. 820 1. 830 - 50 - 25 0 25 50 7 5 100 t em per at ur e t a ( ) o ut p ut v o l t ag e v ou t (v) v i n= 3. 6v 0. 591 0. 593 0. 595 0. 597 0. 599 0. 601 0. 603 0. 605 0. 607 0. 609 - 50 - 25 0 25 50 75 100 t em p er at ur e t a ( ) f eed bac k v olt age v fb (v ) v i n= 3. 6v
rp506 k 24 5) efficiency vs. output current rp506 kx x1 a/b/c v out =1.2v rp506 kx x1 a/b/c v out =1.8v 0 10 20 30 40 50 60 70 80 90 10 0 0 . 01 0 . 1 1 10 100 10 00 100 00 o u t p u t cu r r ent i ou t (m a ) e ffi c i e n c y ( % ) v in =5.0v, v mode =0v v in =3.6v, v mode =0v v in =v mode =5.0v v in =v mode =3.6v 0 10 20 30 40 50 60 70 80 90 100 0. 01 0. 1 1 1 0 10 0 1000 10000 o ut put cur r ent i ou t (m a ) ef f i ci e n cy (% ) v in =5.0v, v mode =0v v in =3 .6 v , v mode =0v v in =v mode =5.0v v in =v mode =3.6v rp506 kx x1 a/b/c v out =3. 3 v 0 10 20 30 40 50 60 70 80 90 10 0 0. 01 0. 1 1 10 1 00 1 000 100 00 o u t put cu r r ent i ou t (m a ) ef f i ci e n cy (% ) v in =5.0v, v mode =0v v in =4.3v, v mode =0v v in =v mode =5.0v v in =v mode =4.3v rp506 kx x1 d/e/f v out = 0 .6v rp506 kx x1 d/e/f v out =0.8v 0 10 20 30 40 50 60 70 80 90 100 0. 01 0. 1 1 10 100 1000 10000 o ut put c ur r e nt i ou t (m a ) e f f i ci e n cy (% ) v in =5.0v, v mode =0v v in =3.6v, v mode =0v v in =v mode =3.6v v in =v mode =5.0v 0 10 20 30 40 50 60 70 80 90 100 0. 01 0. 1 1 10 100 1000 100 00 o u t p u t cu r r ent i ou t (m a ) e f f i ci e n cy (% ) v in =4.5v, v mode =0v v in =3.6v, v mode =0v v in =v mode =4.5v v in =v mode =3.6v
rp506 k 25 rp506 kx x1 d/e/f v out = 1 .2v rp506 kx x1 d/e/f v out =1.8v 0 10 20 30 40 50 60 70 80 90 10 0 0 . 01 0 . 1 1 10 100 10 00 100 00 o u t p u t cu r r ent i ou t (m a ) e f f i c i enc y ( % ) v in =5.0v, v mode =0v v in =3.6v, v mode =0v v in =v mode =5.0v v in =v mode =3.6v 0 10 20 30 40 50 60 70 80 90 100 0. 01 0. 1 1 1 0 10 0 1000 10000 o ut put cur r ent i ou t (m a ) ef f i ci e n cy (% ) v in =5.0v, v mode =0v v in =3 . 6 v , v mode =0v v in =v mode =5.0v v in =v mode =3.6v rp506kxx1d/e/f v out =3.3v 0 10 20 30 40 50 60 70 80 90 10 0 0. 01 0. 1 1 10 1 00 1 000 100 00 o u t put cu r r ent i ou t (m a ) ef f i ci e n cy (% ) v in =5.0v, v mode =0v v in =4.3v, v mode =0v v in =v mode =5.0v v in =v mode =4.3v 6) supply cu rrent v s. ambient tempe ratur e 7) supply current v s . input voltage rp506 k v ou t =1. 8 v (v in =5.5v) rp506 k v out =1.8v mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 35 40 45 50 55 60 65 - 50 0 50 100 t em pe r at ur e t a ( c ) s upply cur r ent ( ua ) closed loop open loop 35 40 45 50 55 60 65 2 . 533 . 54 4 . 555 . 5 i n put v o l t age v in (v ) s upply cur r ent ( ua ) closed loop open loop
rp506 k 26 8) output voltage waveform rp506 kx x1 a/b/c v out =0. 8 v (v in =3. 6 v ) mode =?l?p w m/vfm au to s w i t ching con t rol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 - 50 - 40 - 3 0 - 20 - 10 0 10 20 3 0 4 0 50 ti m e t ( s) o u t put ripp le v o lt a ge( a c ) v r ipple ( v ) -1 0 0 0 10 0 20 0 30 0 40 0 50 0 in d u c t o r c u r r e n t il ( m a ) output voltage il i ou t = 10m a rp506kxx1a/b/c v out =1.2v(v in =3.6v) rp506kxx1a/b/c v out =1.2v(v in =3.6v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 - 5 - 4 - 3 - 2 - 1 012345 ti m e t ( s) o ut put rippl e v ol t age( a c ) v r ipple ( v ) - 100 0 100 200 300 400 i nduc t or cu r r ent i l ( m a ) output voltage il i ou t =1 0 m a -0.03 -0 . 0 2 -0 . 0 1 0. 0 0 0. 0 1 0. 0 2 - 5 0 - 40 - 30 - 20 - 10 0 10 20 30 40 50 ti m e t ( s) o ut put ripple v olt age( a c ) v r i pple ( v ) - 100 0 100 200 300 400 500 i nduc t or cur r ent i l (m a ) output voltage il i ou t =1 0 m a rp506 kx x1 a/b/c v out =1. 8 v (v in =3. 6v) rp506 kx x1 a/b/c v out =1. 8 v (v in =3. 6 v ) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 - 5 - 4 - 3 - 2 - 1 012345 ti m e t ( s) o u t p ut ripple v o lt ag e( a c ) v r ipple ( v ) - 100 0 100 200 300 400 i nduc t or cur r ent i l ( m a ) o u t p u t v o lt age il i ou t =1 0 m a -0 . 0 3 -0 . 0 2 -0 . 0 1 0. 0 0 0. 0 1 0. 0 2 - 5 0 - 40 - 30 - 20 - 10 0 10 20 30 40 50 ti m e t ( s) o u t p ut ripple v o lt ag e( a c ) v r ipple ( v ) - 100 0 100 200 300 400 500 i nduc t or cur r ent i l ( m a ) o u t put v o lt age il i ou t =1 0 m a
rp506 k 27 rp506kxx1a/b/c v out =3.3v(v in =5.0v) rp506kxx1a/b/c v out =1.8v(v in =5.0v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 - 5 - 4 - 3 - 2 - 1 012345 ti m e t ( s) o u t p ut ripple v o lt ag e( a c ) v r ipple ( v ) - 100 0 100 200 300 400 i nduc t or cur r ent i l ( m a ) output voltage il i ou t = 10m a -0.03 -0 . 0 2 -0 . 0 1 0. 0 0 0. 0 1 0. 0 2 - 5 0 - 40 - 30 - 20 - 10 0 10 20 30 40 50 ti m e t ( s) o u t p ut ripple v o lt ag e( a c ) v r ipple ( v ) - 100 0 100 200 300 400 500 i nduc t or cur r ent i l ( m a ) output voltage il i ou t =1 0 m a rp506kxx1d/e/f v out =0.6v(v in =3.6v) rp506kxx1d/e/f v out =0.6v(v in =3.6v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 - 5 - 4 - 3 - 2 - 1 012345 ti m e t ( s) o ut put r i pple v olt age( a c ) v r ipple ( v ) - 100 0 100 200 300 400 i n d u c to r c u r r e n t il ( m a ) output voltage il i ou t =1 0 m a -0.06 -0 . 0 4 -0 . 0 2 0. 0 0 0. 0 2 - 250 - 150 - 50 50 15 0 2 50 ti m e t ( s) o ut put ripple v ol t age( a c ) vr i p p l e ( v) 0 200 400 600 800 i nduc t or cur r ent i l ( m a ) output voltage il i ou t =1 0 m a rp506kxx1d/e/f v out =0.8v(v in =3.6v) rp506kxx1d/e/f v out =0.8v(v in =3.6v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 -5 - 4 -3 - 2 -1 0 1 2 3 4 5 ti m e t ( s) o u t put r i pple v o lt age ( a c ) v r ipple ( v ) -1 0 0 0 10 0 20 0 30 0 40 0 in d u c to r c u r r e n t il ( m a) output voltage il i ou t = 10m a -0.06 -0 . 0 4 -0 . 0 2 0. 0 0 0. 0 2 - 2 50 - 2 00 - 1 5 0 - 1 00 - 5 0 0 5 0 1 00 1 50 20 0 25 0 ti m e t ( s) o ut p ut rip ple v o l t a ge( a c ) v r ip ple ( v ) 0 20 0 40 0 60 0 80 0 in d u c t o r c u r r e n t il ( m a ) output voltage il i ou t = 10m a
rp506 k 28 rp506kxx1d/e/f v out =1.2v(v in =3.6v) rp506kxx1d/e/f v out =1.2v(v in =3.6v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 -5 - 4 -3 - 2 -1 0 1 2 3 4 5 ti m e t ( s) o u t p ut rip p le v o lt a ge( a c ) vr i p p l e ( v) -1 0 0 0 10 0 20 0 30 0 40 0 in d u c to r c u r r e n t il ( m a ) output voltage il i ou t = 10m a -0.06 -0 . 0 4 -0 . 0 2 0. 0 0 0. 0 2 - 2 50 - 2 00 - 1 5 0 - 1 00 - 5 0 0 5 0 1 00 1 50 20 0 25 0 t i m e t ( s) o u t p u t ripple v o lt ag e( a c ) v r ip ple ( v ) 0 20 0 40 0 60 0 80 0 in d u c to r c u r r e n t il ( m a ) output voltage il i ou t = 10m a rp506kxx1d/e/f v out =1.8v(v in =3.6v) rp506kxx1d/e/f v out =1.8v(v in =3.6v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 -5 - 4 -3 - 2 -1 0 1 2 3 4 5 ti m e t ( s) o u t p ut r i pp le v o lt a g e ( a c ) vri p p l e (v) -1 0 0 0 10 0 20 0 30 0 40 0 in d u c to r c u r r e n t il ( m a ) output voltage il i ou t = 10m a -0.06 -0 . 0 4 -0 . 0 2 0. 0 0 0. 0 2 - 2 50 - 2 00 - 1 5 0 - 1 00 - 5 0 0 5 0 1 00 1 50 20 0 25 0 t i m e t ( s) o u t p ut r i pp le v o lt a g e ( a c ) vri p p l e (v) 0 20 0 40 0 60 0 80 0 in d u c to r c u r r e n t il ( m a ) output voltage il i ou t = 10m a rp506kxx1d/e/f v out =3.3v(v in =5.0v) rp506kxx1d/e/f v out =3.3v(v in =5.0v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?h? forced p w m contr ol -0.03 -0 . 0 2 -0 . 0 1 0. 00 0. 01 0. 02 -5 - 4 -3 - 2 -1 0 1 2 3 4 5 ti m e t ( s) o ut p ut rip ple v o lt a ge( a c ) v r ip ple ( v ) -1 0 0 0 10 0 20 0 30 0 40 0 in d u c t o r c u r r e n t il ( m a ) output voltage il i ou t = 10m a -0.03 -0 . 0 2 -0 . 0 1 0. 0 0 0. 0 1 0. 0 2 - 2 50 - 2 00 - 1 5 0 - 1 00 - 5 0 0 5 0 1 00 1 50 20 0 25 0 t i m e t ( s) o ut p ut rip ple v o lt a ge( a c ) v r ip ple ( v ) 0 20 0 40 0 60 0 80 0 in d u c t o r c u r r e n t il ( m a ) output voltage il i ou t = 10m a
rp506 k 29 9) oscillator frequency vs. ambient temperature rp506 kx x1 a/b/c rp506kxx1d/e/f 2.00 2. 05 2. 10 2. 15 2. 20 2. 25 2. 30 2. 35 2. 40 2. 45 2. 50 - 50 - 25 0 25 50 7 5 100 t e m pe r at ur e t a ( c ) f r eque nc y f o s c ( m hz ) vi n =3 .6 1.00 1. 05 1. 10 1. 15 1. 20 1. 25 1. 30 1. 35 1. 40 - 50 - 25 0 25 5 0 75 1 00 t e m per a t u r e t a ( c) f r equen c y f o s c ( m hz ) vin=3.6 10) oscillator frequency vs. input voltage rp506 kx x1 a/b/c rp506kxx1d/e/f 2.00 2. 05 2. 10 2. 15 2. 20 2. 25 2. 30 2. 35 2. 40 2. 45 2. 50 2 . 5 3 3. 5 4 4. 5 5 5 . 5 i n put v o lt age v in (v ) f r equen c y f o s c ( m hz ) -40c 25c 85c 1.00 1. 05 1. 10 1. 15 1. 20 1. 25 1. 30 1. 35 1. 40 2. 5 3 3. 5 4 4. 5 5 5. 5 i nput v o lt age v in (v ) f r equen c y f o s c ( m hz ) -40c 25c 85c 11) soft-start time vs. ambient temperature 150 16 0 17 0 18 0 19 0 20 0 21 0 22 0 23 0 24 0 25 0 - 50 - 25 0 25 5 0 75 100 t e m p er a t ur e t a ( ) s o ft s t a r t ti m e t s ta r t 1 ( u s )
rp506 k 30 12) uvlo detector threshold/ released voltage vs. ambient temperature uvlo detector thresh old uvlo relea sed v olt ag e 2.15 2. 16 2. 17 2. 18 2. 19 2. 20 2. 21 2. 22 2. 23 2. 24 2. 25 - 5 0 - 25 0 2 5 5 0 7 5 1 00 t em per at ur e ( ) uv lo v olt age v uv l o 1 (v ) 2.25 2. 26 2. 27 2. 28 2. 29 2. 30 2. 31 2. 32 2. 33 2. 34 2. 35 - 50 - 25 0 25 5 0 75 1 00 t em per at ur e ( ) uv lo v olt age v uv l o 2 (v ) 13) ce input voltage vs. ambient temperature ce?h? inpu t v o lt age (v in =5.5v) ce? l ? input v olt age (v in =2.5v) 0.3 0. 4 0. 5 0. 6 0. 7 0. 8 0. 9 1. 0 1. 1 - 50 - 25 0 25 50 75 100 t e m per at u r e ( ) ce i nput v olt age v ce h (v ) 0.3 0. 4 0. 5 0. 6 0. 7 0. 8 0. 9 1. 0 1. 1 - 50 - 25 0 25 50 75 100 t em per at ur e ( ) ce i n put v olt age v ce l (v ) 14) lx limit current vs. ambient temperature 2700 28 00 29 00 30 00 31 00 32 00 33 00 - 5 0 - 2 5 0 2 55 07 5 1 0 0 t em p er at u r e ( ) l x l i m i t c u r r e n t i lx l i m (ma)
rp506 k 31 15) nch tr. on resistance vs. ambient temperature 16) pch tr. on resistance vs. ambient temperature 0 0. 02 0. 04 0. 06 0. 08 0. 10 0. 12 0. 14 0. 16 0. 18 0. 20 - 5 0 - 2 502 5 5 0 7 5 1 0 0 t em per at ur e ( ) n ch t r . o n r e si st a n ce r on ( ? ) 0 0. 02 0. 04 0. 06 0. 08 0. 10 0. 12 0. 14 0. 16 0. 18 0. 20 - 50 - 25 0 25 50 7 5 100 t e m per at u r e ( ) p c h t r . o n r es i s t anc e r on ( ? ) 17) pg detector threshold vs. ambient temperature ov er v o lt age dete ction (v ovd ) under v o lt ag e detec t ion (v uv d ) 1.10 1. 15 1. 20 1. 25 1. 30 - 50 - 25 0 2 5 50 7 5 100 t e m per at u r e ( ) p g o v er v olt age de t e c t ion v ov d vo l t a g e ( v se t y) 0.70 0. 75 0. 80 0. 85 0. 90 - 50 - 25 0 25 50 75 100 t em per a t ur e ( ) p g unde r v olt a ge det ec t ion v uv d v o lt age ( vset y) vs e t vs e t vs e t vs e t 18) soft-start waveform rp506k v out =1.8v t ss =open rp506k v out =1.8v t ss =0.1 f 0 2 4 6 - 50 0 50 1 00 150 200 25 0 300 350 40 0 450 ti m e t (u s ) c e i npu t v ol t age ( v ) -1 0 1 2 3 4 o u t pu t v ol t age ( v ) pg vo l t a g e ( v ) 0 2 4 6 - 5 0 5 1 0 15 20 2 5 30 35 40 45 t i m e t ( m s ) c e i npu t v ol t age ( v ) -1 0 1 2 3 4 o u t pu t v ol t age ( v ) pg vo l t a g e ( v ) ce input voltage ce input voltage pg voltage pg voltage output voltage output voltage
rp506 k 32 19) lo ad tra n sient resp onse rp506kxx1a/b/c (v in =3.6v, v out =0.8v) rp506kxx1a/b/c (v in =3.6v, v out =0.8v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 0.70 0. 7 5 0. 8 0 0. 8 5 0. 9 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) o u t put v o lt a g e v ou t (v) 0 50 0 10 00 15 00 o ut put c u r r ent i ou t (ma) 0.70 0. 75 0. 80 0. 85 0. 90 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t put v o lt a g e v ou t (v) 0 500 1000 1500 o ut put c u r r ent i ou t (ma) output voltage output current 200ma-->1000ma output current 1000ma-->200ma output voltage rp506kxx1a/b/c (v in =3.6v, v out =0.8v) rp506kxx1a/b/c (v in =3.6v, v out =0.8v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 0.70 0. 7 5 0. 8 0 0. 8 5 0. 9 0 0. 9 5 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) output current 1000ma-->2000ma 0.70 0. 75 0. 80 0. 85 0. 90 0. 95 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) output current 2000ma-->1000ma output voltage output voltage
rp506 k 33 rp506kxx1a/b/c (v in =3.6v, v out =1.2v) rp506kxx1a/b/c (v in =3.6v, v out =1.2v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 1.00 1. 1 0 1. 2 0 1. 3 0 - 20 0 20 4 0 60 80 100 120 140 16 0 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 100 0 150 0 o ut put c u r r ent i ou t (ma) 1.00 1. 10 1. 20 1. 30 - 20 0 20 40 6 0 80 100 120 1 40 160 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 1000 1500 o ut put c u r r ent i ou t (ma) output current 200ma-->1000ma output current 1000ma-->200ma output voltage output voltage rp506kxx1a/b/c (v in =3.6v, v out =1.2v) rp506kxx1a/b/c (v in =3.6v, v out =1.2v) mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 1.00 1. 1 0 1. 2 0 1. 3 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 ou tp u t c u r r e n t i ou t (ma) 1.00 1. 10 1. 20 1. 30 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o u t p u t c u r r e n t i ou t (ma) output voltage output voltage output current 200ma-->1000ma output current 1000ma-->200ma rp506kxx1a/b/c (v in =3.6v, v out =1.2v) rp506kxx1a/b/c (v in =3.6v, v out =1.2v) 1.00 1. 1 0 1. 2 0 1. 3 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) output current 1000ma-->2000ma 1.00 1. 10 1. 20 1. 30 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) output current 2000ma-->1000ma output voltage output voltage
rp506 k 34 rp506kxx1a/b/c (v in =3.6v, v out =1.8v) rp506kxx1a/b/c (v in =3.6v, v out =1.8v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 1.60 1. 7 0 1. 8 0 1. 9 0 2. 0 0 - 20 0 20 4 0 60 80 100 120 140 16 0 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 100 0 150 0 o ut put c u r r ent i ou t (ma) 1.60 1. 70 1. 80 1. 90 2. 00 - 20 0 20 40 6 0 80 100 120 1 40 160 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 1000 1500 o ut put c u r r ent i ou t (ma) output current 200ma-->1000ma output current 1000ma-->200ma output voltage output voltage rp506kxx1a/b/c (v in =3.6v, v out =1.8v) rp506kxx1a/b/c (v in =3.6v, v out =1.8v) mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 1.60 1. 7 0 1. 8 0 1. 9 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 ou tp u t c u r r e n t i ou t (ma) 1.60 1. 70 1. 80 1. 90 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o u t p u t c u r r e n t i ou t (ma) output voltage output voltage output current 200ma-->1000ma output current 1000ma-->200ma rp506kxx1a/b/c (v in =3.6v, v out =1.8v) rp506kxx1a/b/c (v in =3.6v, v out =1.8v) 1.60 1. 7 0 1. 8 0 1. 9 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) output current 1000ma-->2000ma 1.60 1. 70 1. 80 1. 90 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) output current 2000ma-->1000ma output voltage output voltage
rp506 k 35 rp506kxx1a/b/c (v in =5.0v, v out =3.3v) rp506kxx1a/b/c (v in =5.0v, v out =3.3v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 3.10 3. 2 0 3. 3 0 3. 4 0 3. 5 0 - 20 0 20 4 0 60 80 100 120 140 16 0 180 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 100 0 150 0 o ut put cur r e nt i ou t (ma) 3.10 3. 20 3. 30 3. 40 3. 50 - 20 0 20 40 6 0 80 100 120 1 40 160 180 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o ut put cur r e nt i ou t (ma) output current 200ma-->1000ma output current 1000ma-->200ma output voltage output voltage rp506kxx1a/b/c (v in =5.0v, v out =3.3v) rp506kxx1a/b/c (v in =5.0v, v out =3.3v) mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 3.10 3. 2 0 3. 3 0 3. 4 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 ou tp u t c u r r e n t i ou t (ma) 3.10 3. 20 3. 30 3. 40 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o u t p u t c u r r e n t i ou t (ma) output voltage output voltage output current 200ma-->1000ma output current 1000ma-->200ma rp506kxx1a/b/c (v in =5.0v, v out =3.3v) rp506kxx1a/b/c (v in =5.0v, v out =3.3v) 3.10 3. 2 0 3. 3 0 3. 4 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) 3.10 3. 20 3. 30 3. 40 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) output current 2000ma-->1000ma output voltage output voltage
rp506 k 36 rp506kxx1d/e/f (v in =3.6v, v out =0.6v) rp506kxx1d/e/f (v in =3.6v, v out =0.6v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 0.50 0. 5 5 0. 6 0 0. 6 5 0. 7 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 o ut put c u r r ent i ou t (ma) 0.50 0. 55 0. 60 0. 65 0. 70 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 1000 1500 o ut put c u r r ent i ou t (ma) output voltage output current 200ma-->1000ma output current 1000ma-->200ma output voltage rp506 kx x1 d/e/f (v in =3. 6 v , v out =0.6 v) rp506kxx1d/e/f (v in =3.6v, v out =0.6v) mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 0.50 0. 5 5 0. 6 0 0. 6 5 0. 7 0 0. 7 5 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 ou tp u t c u r r e n t i ou t (ma) 0.50 0. 55 0. 60 0. 65 0. 70 0. 75 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o u t p u t c u r r e n t i ou t (ma) output voltage output voltage output current 200ma-->1000ma o utput c u r r ent 1000ma-->200ma rp506 kx x1 d/e/f (v in =3. 6 v , v out =0.6 v) rp506kxx1d/e/f (v in =3.6v, v out =0.6v) 0.50 0. 5 5 0. 6 0 0. 6 5 0. 7 0 0. 7 5 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) 0.50 0. 55 0. 60 0. 65 0. 70 0. 75 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) output voltage output voltage o utput c ur r ent 1000ma-->2000ma output current 2000ma-->1000ma
rp506 k 37 rp506kxx1d/e/f (v in =3.6v, v out =0.8v) rp506kxx1d/e/f (v in =3.6v, v out =0.8v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 0.70 0. 7 5 0. 8 0 0. 8 5 0. 9 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 o ut put c u r r ent i ou t (ma) 0.70 0. 75 0. 80 0. 85 0. 90 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 1000 1500 o ut put c u r r ent i ou t (ma) output voltage output current 200ma-->1000ma output current 1000ma-->200ma output voltage rp506 kx x1 d/e/f (v in =3. 6 v , v out =0.8 v) rp506kxx1d/e/f (v in =3.6v, v out =0.8v) mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 0.70 0. 7 5 0. 8 0 0. 8 5 0. 9 0 0. 9 5 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 ou tp u t c u r r e n t i ou t (ma) 0.70 0. 75 0. 80 0. 85 0. 90 0. 95 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o u t p u t c u r r e n t i ou t (ma) output voltage output voltage output current 200ma-->1000ma o ut p ut c u r r ent 1000ma-->200ma rp506 kx x1 d/e/f (v in =3. 6 v , v out =0.8 v) rp506kxx1d/e/f (v in =3.6v, v out =0.8v) 0.70 0. 7 5 0. 8 0 0. 8 5 0. 9 0 0. 9 5 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) output current 1000ma-->2000ma 0.70 0. 75 0. 80 0. 85 0. 90 0. 95 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) o ut p ut c u r r en t 2000ma-->1000ma output voltage output voltage
rp506 k 38 rp506kxx1d/e/f (v in =3.6v, v out =1.2v) rp506kxx1d/e/f (v in =3.6v, v out =1.2v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 1.00 1. 1 0 1. 2 0 1. 3 0 - 20 0 20 4 0 60 80 100 120 140 16 0 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 100 0 150 0 o ut put c u r r ent i ou t (ma) 1.00 1. 10 1. 20 1. 30 - 20 0 20 40 6 0 80 100 120 1 40 160 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 1000 1500 o ut put c u r r ent i ou t (ma) output current 200ma-->1000ma output current 1000ma-->200ma output voltage output voltage rp506kxx1d/e/f (v in =3.6v, v out =1.2v) rp506kxx1d/e/f (v in =3.6v, v out =1.2v) mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 1.00 1. 1 0 1. 2 0 1. 3 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 ou tp u t c u r r e n t i ou t (ma) 1.00 1. 10 1. 20 1. 30 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o u t p u t c u r r e n t i ou t (ma) output voltage output voltage output current 200ma-->1000ma output current 1000ma-->200ma rp506kxx1d/e/f (v in =3.6v, v out =1.2v) rp506kxx1d/e/f (v in =3.6v, v out =1.2v) 1.00 1. 1 0 1. 2 0 1. 3 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) output current 1000ma-->2000ma 1.00 1. 10 1. 20 1. 30 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) output current 2000ma-->1000ma output voltage output voltage
rp506 k 39 rp506kxx1d/e/f (v in =3.6v, v out =1.8v) rp506kxx1d/e/f (v in =3.6v, v out =1.8v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 1.60 1. 7 0 1. 8 0 1. 9 0 2. 0 0 - 20 0 20 4 0 60 80 100 120 140 16 0 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 100 0 150 0 o ut put c u r r ent i ou t (ma) 1.60 1. 70 1. 80 1. 90 2. 00 - 20 0 20 40 6 0 80 100 120 1 40 160 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 500 1000 1500 o ut put c u r r ent i ou t (ma) output current 200ma-->1000ma output current 1000ma-->200ma output voltage output voltage rp506kxx1d/e/f (v in =3.6v, v out =1.8v) rp506kxx1d/e/f (v in =3.6v, v out =1.8v) mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 1.60 1. 7 0 1. 8 0 1. 9 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 ou tp u t c u r r e n t i ou t (ma) 1.60 1. 70 1. 80 1. 90 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o u t p u t c u r r e n t i ou t (ma) output voltage output voltage output current 200ma-->1000ma output current 1000ma-->200ma rp506kxx1d/e/f (v in =3.6v, v out =1.8v) rp506kxx1d/e/f (v in =3.6v, v out =1.8v) 1.60 1. 7 0 1. 8 0 1. 9 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) output current 1000ma-->2000ma 1.60 1. 70 1. 80 1. 90 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) output current 2000ma-->1000ma output voltage output voltage
rp506 k 40 rp506kxx1d/e/f (v in =5.0v, v out =3.3v) rp506kxx1d/e/f (v in =5.0v, v out =3.3v) mode =?l?p w m/vfm au to s w i t ching con t rol mode =?l?p w m/vfm au to s w i t ching con t rol 3.10 3. 2 0 3. 3 0 3. 4 0 3. 5 0 - 20 0 20 4 0 60 80 100 120 140 16 0 180 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 100 0 150 0 o ut put cur r e nt i ou t (ma) 3.10 3. 20 3. 30 3. 40 3. 50 - 20 0 20 40 6 0 80 100 120 1 40 160 180 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o ut put cur r e nt i ou t (ma) output current 200ma-->1000ma output current 1000ma-->200ma output voltage output voltage rp506kxx1d/e/f (v in =5.0v, v out =3.3v) rp506kxx1d/e/f (v in =5.0v, v out =3.3v) mode =?h? forced p w m contr ol mode =?h? forced p w m contr ol 3.10 3. 2 0 3. 3 0 3. 4 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( s) ou tp u t v o l t a g e v ou t (v) 0 50 0 10 00 15 00 ou tp u t c u r r e n t i ou t (ma) 3.10 3. 20 3. 30 3. 40 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( s) o u t p ut v o lt ag e v ou t (v) 0 500 1000 1500 o u t p u t c u r r e n t i ou t (ma) output voltage output voltage output current 200ma-->1000ma output current 1000ma-->200ma rp506kxx1d/e/f (v in =5.0v, v out =3.3v) rp506kxx1d/e/f (v in =5.0v, v out =3.3v) 3.10 3. 2 0 3. 3 0 3. 4 0 - 20 0 20 40 60 80 100 120 140 1 60 180 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 10 00 20 00 30 00 o ut put cur r e nt i ou t (ma) output current 1000ma-->2000ma 3.10 3. 20 3. 30 3. 40 - 20 0 20 40 60 80 100 120 140 160 18 0 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 1000 2000 3000 o ut put cur r e nt i ou t (ma) output current 2000ma-->1000ma output voltage output voltage
rp506 k 41 20) auto switching control waveform rp506kxx1a/b/c (v in =3.6v, v out =1.2v, i out =1ma) rp506kxx1a/b/c (v in =3.6v, v out =1.2v, i out =1ma) mode =?l? --> mode=?h? mode =? h ? - -> mo de =?l ? 1.15 1. 20 1. 25 1. 30 - 100 0 10 0 200 300 400 5 00 600 700 80 0 900 ti m e t ( u s ) o u t p ut v o lt age v ou t (v) 0 2 4 6 m ode i npu t v o lt ag e v mo d e (v) output voltage mode input voltage 1.15 1. 20 1. 25 1. 30 - 10 0 0 100 20 0 300 400 500 60 0 700 800 900 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 2 4 6 m o d e in p u t v o l ta g e v mo de (v) output voltage mode input voltage rp506kxx1a/b/c (v in =3.6v, v out =1.8v, i out =1ma) rp506kxx1a/b/c (v in =3.6v, v out =1.8v, i out =1ma) mode =?l? --> mode=?h? mode =? h ? - -> mo de =?l ? 1.75 1. 80 1. 85 1. 90 1. 95 2. 00 - 100 0 100 200 300 4 00 500 600 700 80 0 900 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 2 4 6 m o d e in p u t v o l ta g e v mo de (v) output voltage mode input voltage 1.75 1. 80 1. 85 1. 90 1. 95 2. 00 - 100 0 10 0 200 300 400 50 0 6 00 700 800 900 ti m e t ( u s ) o u t p ut v o lt ag e v ou t (v) 0 2 4 6 m o d e in p u t v o l ta g e v mo de (v) output voltage mode input voltage rp506kxx1d/e/f (v in =3.6v, v out =1.2v, i out =1ma) rp506kxx1d/e/f (v in =3.6v, v out =1.2v, i out =1ma) mode =?l? --> mode=?h? mode =? h ? - -> mo de =?l ? 1.15 1. 20 1. 25 1. 30 - 20 0 0 2 00 40 0 6 00 80 0 10 00 1 20 0 14 00 16 00 1 80 0 ti m e t ( u s ) o ut put v o lt age v ou t (v) 0 2 4 6 m o de i n pu t v ol t ag e v mo d e v) output voltage mode input voltage 1.15 1. 20 1. 25 1. 30 -2 00 0 20 0 4 00 6 00 80 0 1 00 0 1 20 0 14 00 16 00 1 80 0 ti m e t ( u s ) o u t p ut v ol t a ge v ou t (v) 0 2 4 6 m od e i n put v o lt age v mo d e (v) output voltage mode input voltage
rp506 k 42 rp506kxx1d/e/f (v in =3.6v, v out =1.8v, i out =1ma) rp506kxx1d/e/f (v in =3.6v, v out =1.8v, i out =1ma) mode =?l? --> mode=?h? mode =? h ? - -> mo de =?l ? 1.75 1. 80 1. 85 1. 90 1. 95 2. 00 - 2 00 0 20 0 4 00 6 00 80 0 1 00 0 1 20 0 14 00 16 00 1 80 0 ti m e t ( u s ) o u t p ut v ol t a ge v ou t (v) 0 2 4 6 m od e i n put v o lt age v mo d e (v) output voltage mode input voltage 1.75 1. 80 1. 85 1. 90 1. 95 2. 00 -2 00 0 2 00 40 0 60 0 80 0 10 00 12 00 1 40 0 1 60 0 1 80 0 ti m e t ( u s ) o u t p ut v ol t a ge v ou t (v) 0 2 4 6 m od e i n put v o lt age v mo d e (v) output voltage mode input voltage
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