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679 typical performance characteristics synchronous step-down dc/dc high efficiency :92% low ripple voltage :10mv output current :500ma (vin=3.0v, vout=1.8v)* oscillation frequency :600khz, 1.2mhz pwm fixed control :(xc9215 series) pwm/pfm automatic switching control :(XC9216 series) manual selection of switching control :(xc9217 series) maximum duty ratio :100% ceramic capacitor compatible ultra small packages :sot-25, usp-6b general description the xc9215/9216/9217 series is a group of synchronous-rectification type dc/dc converters with a built-in 0.6
p-channel driver transisto r and 0.7
n-channel switching transistor, designed to allow the use o f ceramic capacitors. the ics enable a high efficiency, stable powe r supply with an output current of 500ma to be configured using only a coil and two capacitors connected externally. minimum operating voltage is 2.0v. output voltage is internally programmable in a range from 0.9v to 4.0v in increments of 100m v (accuracy: ? 2.0%). with the built-in oscillator, oscillation frequency is selectable from 600khz and 1.2mhz to make available the frequency best suited to your particular application. a s for operation mode, the xc9215 series is pwm control, the XC9216 series is automatic pwm/pfm sw itching control and the xc9217 series can be manually switched between the pwm control mode and the automatic pwm/pfm switching control mode, allowing fast response, low ripple and high efficiency over the full range of load (from light load to high output current conditions). the soft start and current control functions are internally optimized. during standby, all circuits are shutdown to reduce current consumption to as low as 1.0 a or less. with the built-in u.v.l.o. (under voltage lock out) function, the internal p channel driver transistor is forced off when input voltage becomes 1.4v or lower. two types of package, sot-25 (250mw) and usp-6b (100 mw), are available. a pplications ? mobile phones (pdc, gsm, cdma, imt200 etc.) ? bluetooth equipment ? pdas ? portable communication modem ? portable games ? cameras ? digital cameras ? cordless phones ? notebook computers typical application circuit features p-ch driver tr. built-in :on resistance 0.6
n-ch synchronous driver tr. built-in :on resistance 0.7
input voltage range :2.0 ~ 6.0v output voltage range : 0.9v~4.0v (100mv increments) high efficiency :92% (typ.) (vin=3.0v, vout=1.8v, iout=100ma)* output current :500ma (vin=3.0v, vout=1.8v)* oscillation frequency :600khz, 1.2mhz (fixed frequency accuracy ? 15%) ultra small packages :sot-25 usp-6b soft-start circuit built-in current limiter circuit built-in (constant current & latching) low esr ceramic capacitor compatible * performance depends on external components and wiring on the pcb. ? effciency vs. output current 1 2 3 4 5 l vout (500ma) ce/mode cin (ceramic) vin cl (ceramic) lx vout ce/ mode vin vss xc9217a18c 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 output current :iout(ma) efficiency:effi(%) vin=2.7 v vin=3.6v vin=5.0v pwm/pfm automatic switching control pwm control l=3.3 h(cdrh 3d16 ), cin=4.7 f(ceramic), cl=10 f(ceramic), topr=25 ? ? go-com p atible
680 xc9215/9216/9217 series pin number sot-25 usp-6b pin name function 1 6 vin power input 2 2, 5 vss ground 3 4 ce / mode chip enable / mode switch 4 3 vout output voltage sense 5 1 lx switching output designator description symbol description a : ce input logic high active, ce pin open (standard) b : ce input logic low active, ce pin open (semi-custom) c : ce input logic high active, pull-dow n resistor built-in (semi-custom) ? type of dc/dc converter transistor built-in, output voltage internally set (vout product), soft start internally set, current limit 700ma d : ce input logic low active, pull-up resistor built-in (semi-custom) ? ? output voltage 09 ~ 40 : 100mv increments e.g. vout = 1.5v ? = 1, ? = 5 6 : 600khz ? oscillation frequency c : 1.2mhz m : sot-25 (sot-23-5) ? package d : usp-6b r : embossed tape, standard feed ? device orientation l : embossed tape, reverse feed pin configuration pin configuration sot-25 (top view) usp-6b (bottom view) * please short the vss pin (pin no. 2 and 5) before use. please use the circuit without connecting the heat dissipation pad. if the pad must be connected due to a problem of heat dissipation or mounting intensity, connect to t he vss pin (pin no. 5). product classification ? ordering information xc9215 ?????? pwm fixed control XC9216 ?????? pwm / pfm automatic switching control xc9217 ?????? pwm fixed control pwm / pfm automatic switching, manual switching
681 xc9215/9216/9217 series packaging information ? sot-25 ? usp-6b * pin no. 1 is thicker than other pins. a - a cross sectional view 6 5 4 1 2 3 a ' a aaa a a a 1 . 4 5 6 3 2 1 0 1 1 1 1 1 2.0 + 0.15 (0.45) 0.5+0.1 (0.05) (0.45) (0.45) 4 5 o 4 5 o 1.8+0.15 (0.27) (0.27) (0.27) ( 0.45) 4 5 o 4 5 o (0.125) (0.65) 0.005+0.002 (0.05) -0.005 +0.01 -0.05 +0.15 0.7+0.03 5-0.2+0.05 0.5+0.1 1.6+0.15 0.5+0.1 0.1+0.03 0.2+0.05 1.0+0.1 0.25+0.1 0.25+0.1 o
682 xc9215/9216/9217 series mark product series xc9215a x x x m x XC9216a x x x m x xc9217a x x x m x mark fosc=600khz fosc=1.2mhz output voltage (xc92 x x a ? x 6 m x) (xc92 x x a ? x c m x ) 0.x 0 0 1.x 1 1 2.x 2 2 3.x 3 3 4.x 4 4 mark fosc=600khz fosc=1.2mhz output voltage (xc92 x x a x ? 6 m x) (xc92 x x a x ? c m x ) x.0 0 a x.1 1 b x.2 2 c x.3 3 d x.4 4 e x.5 5 f x.6 6 h x.7 7 k x.8 8 l x.9 9 m mark ? represents product series and type of dc/dc converter marking rule ? sot-25 sot-25 (top view) e f g * character inversion used mark ? represents integer of output voltage and oscillation frequency * output voltage 0.9v ~ 4.0v (100m v increments) are standard products. please ask our sales contact for output voltages of 50mv increments (semi-custom products). mark ? represents production lot number 0 to 9, a to z, reversed character of 0 to 9 and a to z repeated (g, i, j, o, q, w excepted) mark ? represents decimal point of output voltage and oscillation frequency
683 xc9215/9216/9217 series mark product series xc9215a x x x d x XC9216a x x x d x xc9217a x x x d x mark product series current limit a xc92 x x a x x x d x 700ma mark output voltage (xc92 x x a ? x x d x) 0.x 0 1.x 1 2.x 2 3.x 3 4.x 4 mark output voltage (xc92 x x a ? x x d x) x.0 0 x.1 1 x.2 2 x.3 3 x.4 4 x.5 5 x.6 6 x.7 7 x.8 8 x.9 9 mark product series frequency 6 xc92 x x a x x 6 d x 600khz c xc92 x x a x x c d x 1.2mhz mark ? represents product series and type of dc/dc converter marking rule (continued) ? usp-6b usp-6b (top view) * character inversion used. mark ? represents type of voltage regulators * output voltage 0.9v ~ 4.0v (100m v increments) are standard products. please ask our sales contact for output voltages of 50mv increments (semi-custom products). mark ? represents production lot number 0 to 9, a to z, reversed (g, i, j, o, q, w excepted) note: no character inversion used. f b e mark ? represents integer of output voltage mark ? represents integer of output voltage mark ? represents oscillation frequency
684 xc9215/9216/9217 series parameter symbol ratings units vin pin voltage vin - 0.3 ~ 6.5 v lx pin voltage vlx - 0.3 ~ vin + 0.3 v vout pin voltage vout - 0.3 ~ 6.5 v ce / mode pin voltage vce - 0.3 ~ vin + 0.3 v lx pin current ilx ? 1000 ma sot-25 250 power dissipation usp-6b pd 100 mw operating temperature range topr - 40 ~ + 85 ? storage temperature range tstg - 55 ~ +125 ? block diagram note: the signal from ce/mode control logic to pwm/pfm selector is being fixed to "l" level inside, and xc9215 series chooses onl y pwm control. the signal from ce/mode control logic to pwm/pfm selector is being fixed to "h" level inside, and XC9216 series chooses onl y pwm/pfm automatic switching control. pwm comparator error amp. u.v.l.o comp. phase compensation buffer driver logic current limit & feedback ramp wave generator, osc ce/mode control logic pwm/pfm selector vref with soft start, ce u.v.l.o. p ch driver tr. n ch sw tr. r1 r2 vout vin lx ce/mode vss a bsolute maximum ratings ta = 2 5 ?
685 xc9215/9216/9217 series parameter symbol conditions min. typ. max. unit circuit output voltage vout when connected to external components, ce=vin, iout=30ma 1.764 1.800 1.836 v ? operating voltage range vin 2.0 - 6.0 v ? maximum output current ioutmax vin=3.0v, when connected to external components (*10) 500 - - ma ? u.v.l.o. voltage vuvlo ce=vin, vout=0v, voltage which lx pin voltage holding "l" level (*1) 1.00 1.40 1.78 v ? supply current idd vin=ce=3.6v, vout=fixed voltage x 1.1v - 70 115 a ? stand-by current istb vin=3.6v, ce=0v, vout=fixed voltage x 1.1v - 0 1.0 a ? oscillation frequency fosc when connected to external components, iout=100ma 1020 1200 1380 khz ? pfm switch current ipfm when connected to external components, ce=vin, iout=1ma 100 140 180 ma ? maximum duty ratio maxdty ce=vin, vout=0v 100 - - % ? minimum duty ratio mindty ce=vout=vin - - 0 % ? efficiency (*2) effi when connected to external components, ce=vin=3.0v, iout=100ma - 90 - % ? lx sw ?h? on resistance rlxh ce=0.5vin, vout=0v, ilx=100ma (*3) - 0.6 1.2
? lx sw ?l? on resistance rlxl ce=0.5vin, ilx=100ma (*4) - 0.7 1.4
- lx sw ?h? leak current ileakh vin=vout=5.0v, ce=0v, lx=0v (*5) - 0.01 1.00 a ? lx sw ?l? leak current ileakl vin=vout=5.0v, ce=0v, lx=5.0v - 0.01 1.00 a ? current limit ilim vin=ce=5.0v, vout=0v 600 700 - ma ? output voltage temperature characteristics vout vout ~ topr iout=30ma -40 ?? topr ? 85 ? - +100 - ppm/ ? ? ce ?h? voltage vceh vout=0v, when ce voltage is applied lx determine "h" 0.9 - vin v ? ce ?l? voltage vcel vout=0v, when ce voltage is applied lx determine "l" vss - 0.3 v ? pwm ?h? level voltage vpwmh when connected to external components, iout=1ma (*6) - - vin - 1.0 v ? pwm ?l? level voltage vpwml when connected to external components, iout=1ma (*6) vin - 0.3 - - v ? ce ?h? current iceh vin=ce=5.5v, vout=0v - 0.1 - 0.1 a ? ce ?l? current icel vin=5.5v, ce=0v, vout=0v - 0.1 - 0.1 a ? soft-start time tss when connected to external components, ce=0v vin, iout=1ma 0.5 1.0 3.0 msec ? latch time tlat when connected to external components, vin=ce=5.0v, short vout by 1
resistance (*7) 1 - 20 msec ? electrical characteristics xc9215a18cxx, XC9216a18cxx, xc9217a18cxx vout=1.8v, fosc=1.2mhz, ta=25 ? test conditions: unless otherwise stated, vin=3.6v note: *1 : including hysteresis operating voltage range. *2 : effi = { ( output voltage x output current ) / ( input voltage x input current) } x 100 *3 : on resistance (
)= lx pin measurement voltage / 100ma *4 : r&d value *5 : when temperature is high, a current of approximately 20 a (maximum) may leak. *6 : the ce/mode pin of the xc9217a series works also as an ex ternal pwm control and pwm/pfm control switching pin. when the ic is in the operation,control is switched to the automatic pwm/pfm switching mode when the ce/mode pin voltage is equal to o r greater than vin minus 0.3v, and to the pwm when the ce/mod e pin voltage is equal to or lower than vin minus 1.0v and equal to or greater than vceh. *7 : time until it short-circuits dcout with gnd through 1
of resistance from a state of operation and is set to dcout=0v from current limit pulse generating. *8 : there is no pfm switch current for xc9215 series. the pfm switch current is only for XC9216/17 series. *9 : there is no pwm "h" level voltage or pwm "l" level voltage for xc9215/16 series. the c haracteristics are only for xc9217 series. *10 : when the difference between the input and the output is sma ll, some cycles may be skipped completely before current maxim izes. if current is further pulled from this state, output vo ltage will decrease because of p-ch driver on resistance.
686 xc9215/9216/9217 series parameter symbol conditions min. typ. max. unit circuit output voltage vout when connected to external components, ce=vin, iout=30ma 3.234 3.300 3.366 v ? operating voltage range vin 2.0 - 6.0 v ? maximum output current ioutmax vin=4.5v, when connected to external components (*10) 500 - - ma ? u.v.l.o. voltage vuvlo ce=vin, vout=0v, voltage which lx pin voltage holding "l" level (*1) 1.00 1.40 1.78 v ? supply current idd vin=ce=5.0v, vout=fixed voltage x 1.1v - 75 120 a ? stand-by current istb vin=5.0v, ce=0v, vout=fixed voltage x 1.1v - 0 1.0 a ? oscillation frequency fosc when connected to external components, iout=100ma 1020 1200 1380 khz ? pfm switch current ipfm when connected to external components, ce=vin, iout=1ma 100 140 180 ma ? maximum duty ratio maxdty ce=vin, vout=0v 100 - - % ? minimum duty ratio mindty ce=vout=vin - - 0 % ? efficiency (*2) effi when connected to external components, ce=vin=4.5v, 3.0v, iout=100ma - 92 - % ? lx sw ?h? on resistance rlxh ce=0.5vin, vout=0v, ilx=100ma (*3) - 0.5 1.0
? lx sw ?l? on resistance rlxl ce=0.5vin, ilx=100ma (*4) - 0.6 1.2
- lx sw ?h? leak current ileakh vin=vout=5.0v, ce=0v, lx=0v (*5) - 0.01 1.0 a ? lx sw ?l? leak current ileakl vin=vout=5.0v, ce=0v, lx=5.0v - 0.01 1.0 a ? current limit ilim vin=ce=5.0v, vout=0v 600 700 - ma ? output voltage temperature characteristics vout vout ~ topr iout=30ma -40 ?? topr ? 85 ? - ? 100 - ppm/ ? ? ce ?h? voltage vceh vout=0v, when ce voltage is applied lx determine "h" 0.9 - vin v ? ce ?l? voltage vcel vout=0v, when ce voltage is applied lx determine "l" vss - 0.3 v ? pwm ?h? level voltage vpwmh when connected to external components, iout=1ma (*6) - - vin - 1.0 v ? pwm ?l? level voltage vpwml when connected to external components, iout=1ma (*6) vin-0.3 - - v ? ce ?h? current iceh vin=ce=5.5v, vout=0v - 0.1 - 0.1 a ? ce ?l? current icel vin=5.5v, ce=0v, vout=0v - 0.1 - 0.1 a ? soft-start time tss when connected to external components, ce=0v vin, iout=1ma 0.5 1.0 3.0 msec ? latch time tlat when connected to external components, vin=ce=5.0v, short vout by 1
resistance (*7) 1 - 20 msec ? electrical characteristics (continued) xc9215a33cxx, XC9216a33cxx, xc9217a33cxx vout=3.3v, fosc=1.2mhz, ta=25 ? test conditions: unless otherwise stated, vin=5.0v note: *1 : including hysteresis operating voltage range. *2 : effi = { ( output voltage x output current ) / ( input voltage x input current) } x 100 *3 : on resistance (
)= lx pin measurement voltage / 100ma *4 : r&d value *5 : when temperature is high, a current of approximately 20 a (maximum) may leak. *6 : the ce/mode pin of the xc9217a series works also as an exte rnal pwm control and pwm/pfm cont rol switching pin. when the ic is in the operation,control is switched to the automatic pw m/pfm switching mode when the ce/mode pin voltage is equal to o r greater than vin minus 0.3v, and to the pwm mode when the ce /mode pin voltage is equal to or lower than vin minus 1.0v and equal to or greater than vceh. *7 : time until it short-circuits dcout with gnd through 1
of resistance from a state of operation and is set to dcout=0v from current limit pulse generating. *8 : there is no pfm switch current for xc9215 series. the pfm switch current is only for XC9216/17 series. *9 : there is no pwm "h" level voltage or pwm "l" level volt age for xc9215/16 series. the characteristics are only for xc9217 series. *10 : when the difference between the input and the output is small, some cycles may be skipped completely before current maximizes . if current is further pulled from this state, output vo ltage will decrease because of p-ch driver on resistance.
687 xc9215/9216/9217 series typical application circuit fosc=1.2mhz l: 3.3 h (cdrh3d16, sumida) cin: 4.7 f (ceramic) cl: 10 f (ceramic) fosc=600khz l: 6.8 h (cdrh4d18c, sumida) cin: 4.7 f (ceramic) cl: 10 f (ceramic) notes on use ? application information 1. the xc9215/16/17 series is designed for use with ceramic output capacitors. if, however, the potential difference between dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation could occur on the output. if the input-output potential difference is large, connect an electrolytic capacitor in parallel to compensate for insufficient capacitance. 2. spike noise and ripple voltage arise in a switching regulator as with a dc/dc converter. these are greatly influenced by external component selection, such as the coil inductance, capacitance values, and board layout o f external components. once the design has been completed, verification with actual components should be done. 3. depending on the input-output voltage differential, or load current, some pulses may be skipped, and the ripple voltage may increase. 4. when the difference between vin and vout is large in pwm control, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped completely. 5. when the difference between vin and vout is small, and the load current is heavy, very wide pulses will be outputted and there is the possibility that some cycles may be skipped completely: in this case, the lx pin may not go low at all. 6. with the ic, the peak current of the coil is controlled by the current limit circuit. since the peak current increases when dropout voltage or load current is high, current limit starts operating, and this can lead to instability. when peak current becomes high, please adjust the coil inductance value and fully check the circuit operation. in addition, please calculate the peak current according to the following formula: ipk = (vin-vout) * onduty / (2 x l x fosc) + iout l: coil inductance value fosc: oscillation frequency 7. when the peak current, which exceeds limit current, flows within the specified time, the built-in p-ch drive r transistor is turned off. during the time until it detects limit current and before the built-in transistor can be turned off, the current for limit current flows; therefore, care must be taken when selecting the rating for the coil or the schottky diode. 8. when vin is less than 2.4v, limit current may not be reached because voltage falls caused by on resistance. 9. care must be taken when laying out the pc board, in order to prevent misoperation of the current limit mode. depending on the state of the pc board, latch time may become longer and latch operation may not work. in order to avoid the effect of noise, the board should be laid out so that capacitors are placed as close to the chip as possible. 10. use of the ic at voltages below the recommended voltage range may lead to instability. 11. this ic should be used within the stated absolute maximum ratings in order to prevent damage to the device. 12. when the ic is used in high temperature, output voltage may increase up to input voltage level at no load because of the leak current of the driver transistor. 1 2 3 4 5 l vout (400ma) ce/mode cin (ceramic) vin cl (ceramic) lx vout ce/ mode vin vss
688 xc9215/9216/9217 series notes on use (continued) ? application information (continued) 13. when the inductance value of the coil is large and under t he condition of large dropout voltage in continuous mode, operation may become unstable. a coil with an inductance value from 3.3 h to 6.8 h should be used. please verify with actual parts. ex.) vout = 0.9v fosc = 1.2mhz vin = 6.0v iout = 70ma l : 10 h (cdrh4d18c) cin : 4.7 f (ceramic) ch1: lx 2v / div cl : 10 f (ceramic) ch2: vout 20mv / div 14. the ripple voltage may increase when pfm/pwm automatic switchin g control changes to pfm control in continuous mode. please adjust the inductance va lue and verify with actual parts. ex.) vout = 1.8v fosc = 1.2mhz vin = 2.39v iout = 70ma ch1:lx 2v / div l : 3.3 h (cdrh3d16) cin : 4.7 f (ceramic) cl : 10 f (ceramic) ch2: vout 20mv / div 5 sec/div 100 sec / div
689 xc9215/9216/9217 series notes on use (continued) ? application information (continued) ? instructions on pattern layout 1. in order to stabilize vin's voltage level, we recommend that a by-pass capacitor (cin) be connected as close as possible to the vin & vss pins. 2. please mount each external component as close to the ic as possible. 3. wire external components as close to the ic as possible and use thick, short connecting traces to reduce the circuit impedance. 4. make sure that the pcb gnd traces are as thic k as possible, as variations in ground potential caused by high ground currents at the time of switch ing may result in instability of the ic. ? recommended pattern layout sot-25 l cin vin vss ce vout vss cl ic ceramic_cap inductor * please use an electric wire for vin, vout, vss, and ce. usp-6b * please use an electric wire for vin, vout, vss, and ce. ceramic_cap inductor vss vout vss cin l ce ic cl vin
690 xc9215/9216/9217 series operational explanation the xc9215/9216/9217 series consists of a reference voltage sour ce, ramp wave circuit, error amplifier, pwm comparator, phase compensation circuit, output voltage adjustmen t resistors, p-channel mosfet driver transistor, n-channel mosfet switching transistor for the synchronous switch, current limiter circuit, u. v.l.o. circuit and others. the se ries ics compare, using the erro r amplifier, the voltage of the internal voltage reference source with the feedback voltage from t he vout pin through split resist ors, r1 and r2. phase compensation is performed on the resulting erro r amplifier output, to input a signal to the pwm comparator to determine the turn-on time during pwm operation. the pwm comparat or compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circui t, and delivers the resulting output to the buffer driver circuit t o cause the lx pin to output a switching duty cycle. this process is continuously performed to ensure stable output voltage. the curr ent feedback circuit monitors the p-channel mos driver transistor current for each switching operation, and modulates the erro r amplifier output signal to provide multiple feedback signals. this enables a stable feedback loop even when a low esr capacito r, such as a ceramic capacitor, is used, ensuring stable output voltage. the reference voltage source provides the reference volt age to ensure stable output voltage of the dc/dc converter. the ramp wave circuit determines switching frequency. the fr equency is fixed internally and can be selected from 600khz and 1.2mhz. clock pulses generated in this circuit are us ed to produce ramp waveforms needed for pwm operation, and to synchronize all the internal circuits. the error amplifier is designed to monitor output voltage. the amplifier compares the reference voltage with the feedback volt age divided by the internal split resistors, r1 and r2. when a vo ltage lower than the reference voltage is fed back, the output vo ltage of the error amplifier increases. the gain and frequency characte ristics of the error amplifier output are fixed internally to deliver an optimized signal to the mixer. the current limiter circuit of the xc9215 / 9216 / 9217 series monitors the current flowing through the p-channel mos drive r transistor connected to the lx pin, and f eatures a combination of the constant-cu rrent type current lim it mode and the operatio n suspension mode. ? when the driver current is greater than a specific level, the constant-current type current limit function operates to turn o ff the pulses from the lx pin at any given timing. ? when the driver transistor is turned off, the limiter circ uit is then released from the current limit detection state. ? at the next pulse, the driver transistor is turned on. however, the transistor is immediately turned off in the case of an o ve r current state. ? when the over current state is elimi nated, the ic resumes its normal operation. the ic waits for the over current state to end by repeating the steps ? through ? . if an over current state continues for a fe w msec and the above three steps are repeatedl y performed, the ic performs the function of latching the off state of the drive r transistor, and goes into operation suspension mode. once the ic is in suspension mode, operations can be resumed by eithe r turning the ic off via the ce/mode pin, or by restoring power to the vin pin. the suspension mode does not mean a complete shutdown, but a state in which pulse output is suspended; ther efore, the internal circuitry remains in operation. the constant-current type current limit of t he xc9215 / 9216 / 9217 series can be set at 700ma. when the vin pin voltage becomes 1.4v or lower, the p-channel out put driver transistor is forced off to prevent false pulse out pu t caused by unstable operation of the internal circuitry. when t he vin pin voltage becomes 1.8v or higher, switching operation t akes place. by releasing the u.v.l.o. function, the ic performs the soft start function to initiate output startup operation. the s oft start function operates even when the vin pin voltage falls momentarily below the u.v.l.o. operating voltage. the u.v.l.o. circuit d oes not cause a complete shutdown of the ic, but causes pulse output to be suspended; therefore, the internal circuitry remains in o p eration.
691 xc9215/9216/9217 series sw_ce status on stand-by off operation sw_ce status on operation off stand-by sw_ce sw_pwm/pfm status on * pwm/pfm automatic switching control off on pwm control off off stand-by sw_ce sw_pwm/pfm status on * stand-by off on pwm control off off pwm/pfm automatic switching control ce/mode operation voltage level xc9215a series XC9216a series xc9217a series h level *1 synchronous pwm/pfm automatic switching control m level *2 synchronous pwm fixed control synchronous pwm/pfm automatic switching control synchronous pwm fixed control l level *3 stand-by stand-by stand-by (a) ? xc9217a series - examples of how to use ce/mode pin functions * ce/mode pin voltage level range 1. h level: vin ? 0.3v ? h level ? vin 2. m level: 0.9v ? m level ? vin ? 1.0v 3. l level: 0v ? level ? 0.3v operational explanation (continued) the operation of the xc9215a / 9216a / 9217a series will enter into the shut down mode when a low level signal is input to the ce/mode pin. during the shut down mode, the current consumption occurs only in the detector and is 0 a (typ.), with a state o f high impedance at the lx pin and vout pin. the ic starts its o peration by inputting a high level signal to the ce/mode pin. t he input to the ce/mode pin is a cmos input and the sink current is 0 a (typ.). ? xc9215a / 9216a series - examples of how to use ce/mode pin (b) (a) (b) (a) (b) (a) (b) intermediate voltage can be generated by rm1 and rm2. pleas e set the value of each r1, r2, rm1, rm2 at around 100k
. for switches, cpu open-drain i/o port and transistor can be used.
692 xc9215/9216/9217 series 600khz 1.2mhz cin 4.7 f (ceramic) 4.7 f (ceramic) cl 10 f (ceramic) 10 f (ceramic) l 6.8 h (cdrh4d18c ,sumida) 3.3 h (cdrh3d16 ,sumida) test circuits circuit ? circuit ? circuit ? circuit ? circuit ? circuit ? vin lx vss ce/ mode vout cin v iout cl l wave form measure point a rl vin lx vss ce/ mode vout v rpulldow n 1k ? 1 f vin lx vss ce/ mode vout a 1 f vin lx vss ce/ mode vout v rpulldow n 20 0
1 f osc illat ion che ck p oin t vin lx vss ce/ mode vout 1 f v 100 ma on resistance=(v in-v lx)/100 ma vin l x vss ce/ mode vout a 1 f ileakl ileakh
693 xc9215/9216/9217 series 600khz 1.2mhz cin 4.7 f (ceramic) 4.7 f (ceramic) cl 10 f (ceramic) 10 f (ceramic) l 6.8 h (cdrh4d18c ,sumida) 3.3 h (cdrh3d16 ,sumida) test circuits (continued) circuit ? circuit ? circuit ? vin l x vss ce/ mode vout 1 f v ilim oscillation check point vin lx vss ce/ mode vout 1 f a icel iceh rpulldow n 1k ? v vin l x vs s ce/ mode vout ci n v ilat cl l wave form measure point a 1 ?
694 xc9215/9216/9217 series typical performance characteristics (1) efficiency vs. output current (2) output voltage vs. output current
695 xc9215/9216/9217 series typical performance characteristics (continued) (2) output voltage vs. output current (continued) (3) ripple voltage vs. output current
696 xc9215/9216/9217 series typical performance characteristics (continued) (4) oscillation frequency vs. ambient temperature (5) supply current vs. ambient temperature (6) output voltage vs. ambient temperature (7 ) u.v.l.o. voltage vs. ambient temperature
697 xc9215/9216/9217 series typical performance characteristics (continued) (8) ce ?h? ?l? voltage vs. ambient temperature (9) soft-start time vs. ambient temperature (10) ?p-ch/n-ch? driver on re sistance vs. ambient temperature
698 xc9215/9216/9217 series iout=0.1ma 100ma iout=0.1ma 300ma 1ch : iout 1ch : iout 2ch : 2ch : vout=50mv/div vout=50mv/div 20 sec/div 20 sec/div typical performance characteristics (continued) (11) load transient response time xc9217a18c l=3.3 h (cdrh3d16), cin=4.7 f (ceramic), cl=10 f (ceramic), topr=25 ? vin=3.6v, ce=vin (pwm/pfm automatic switching control) iout=100ma 0.1ma iout=300ma 0.1ma 1ch : iout 1ch : iout 2ch : 2ch : vout=50mv/div vout=50mv/div 200 sec/div 200 sec/div
699 xc9215/9216/9217 series iout=0.1ma 100ma iout=0.1ma 300ma 1ch : iout 1ch : iout 2ch : 2ch : vout=50mv/div vout=50mv/div 20 sec/div 20 sec/div typical performance char a cteristics (continued) (11) load transient response time (continued) xc9217a18c l=3.3 h (cdrh3d16), cin=4.7 f (ceramic), cl=10 f (ceramic), topr=25 ? vin=3.6v, ce=0.5 vin (pwm/pfm automatic switching control) iout=0.1ma 100ma iout=0.1ma 300ma 1ch : iout 1ch : iout 2ch : 2ch : vout=50mv/div vout=50mv/div 200 sec/div 200 sec/div

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