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? 2010 s emiconductor components industries, llc. p ublication order number: december - 2017, rev. 2 fan53611 /d fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator fan5360 1 / fan5361 1 6 mhz , 600 ma / 1 a synchronous buck regulator features ? 600 ma or 1 a output current capability ? 24 a typical quiescent curren t ? 6 mhz fix ed - frequency operation ? best - in - class load transient response ? best - in - class efficiency ? 2. 3 v to 5 .5 v input voltage range ? low ripple light - load pfm mode ? forced pwm and external clock synchronization ? internal sof t - start ? input u nder - v oltage l ockout (uvlo) ? thermal shutdow n and overload protection ? optional output discharge ? 6 - bump wlcsp, 0.4 mm pit c h appli cations ? 3g, 4g, wifi ? , wimax?, and wibro ? data cards ? tablets ? dsc, dv c ? netbooks ? , ultra - mobile pcs all trademarks are the property of their respective owners. description the fan53601 /11 is a 6 mhz , step - dow n sw itching voltage regulator , available in 60 0 ma or 1 a options , that delivers a fixed output from an input voltage supply of 2.3 v to 5.5 v. using a propr ietary architecture w ith synchronous rectification, the fa n5 36 0 1 /11 is capable of delivering a peak efficiency of 92%, w hile maintaining efficien cy over 80% at load currents as low as 1 ma . the regulator operates at a nominal fixed frequency of 6 mhz , w hich reduces the value of the external components to as low as 470 n h for the output inductor and 4.7 f for the output capacitor. in addition, t he pulse width modulation ( pwm ) modulator can be synchronized to an external frequency source. at moderate and light loads, p ulse f requency m odulation ( pf m) is used to operate the device in p ow er - s ave m ode w ith a typical quiescent current of 24 a. even w ith such a low quiescent current, the part exhibits excellent transient response during large load sw ings. at higher loads, the system automatically sw itches to fixed - frequency control, operating at 6 mhz . in s hutdow n m ode , the supply current drops below 1 a, reducing pow er consumption. for applications that require minimum ripple or fixed frequency , pfm m ode can be disabled using the mode pin. the fa n536 0 1 /11 is available in 6 - bu mp , 0.4 mm pitch , wafer - level chip - scale package (wlcsp). figure 1. typical applicatio n sw mode gnd en l 1 c in 2 . 2 f 470 nh c 2 b 2 a 2 c 1 b 1 a 1 fb 4 . 7 f c out vin
w ww.onsemi.com 2 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator ordering information part number output voltage ( 1 ) max. output current active discharge ( 2 ) m ax . v in package temperature range packing fan53601auc10x 1.000 v 60 0 ma yes 5.5 v wlcsp - 6, 0.4 mm pit c h - 40 to +85c tape and reel fan53601auc105 x 1.05 0 v 600 ma yes fan53611auc11x 1.1 0 0 v 1 a yes fan53611auc11 5 x 1.15 0 v 1 a yes fan53611auc13x 1.300 v 1 a yes fan53611auc135x 1.350 v 1 a yes fa n53 611uc123x 1.233 v 1 a no fan53601uc182x 1.820 v 600 ma no FAN53611AUC205X 2.050 v 1 a yes fan53611auc123x 1.233 v 1 a yes fan53611auc12x 1.200 v 1 a yes fan53611auc18x 1.800 v 1 a yes notes: 1. other voltage options available on request. contact a o n semiconductor representative. 2. all voltage and output current options are available w ith or w ithout active discharge. contact a o n semiconductor representative. pin configuration s c 1 b 1 a 1 c 2 b 2 a 2 mode sw fb vin en gnd c 1 b 1 a 1 c 2 b 2 a 2 mode sw fb vin en gnd figure 2. bumps facing dow n figure 3. bumps facing up pin definitions pin # name description a1 mode m ode . logic 1 on this pin forces the ic to stay in pwm m ode . a logic 0 allow s the ic to automatically sw itch to pfm during light loads. the regulator also synchronizes its sw itching frequency to four times th e frequency provided on this pin. do not leave this pin floating. b1 sw sw itching node . connect to output inductor . c1 fb feedback / v out . connect to output voltage. c2 gnd ground . pow er and ic ground. all signals are referenced to this pin. b2 en en a b le . the device is in s hutdow n m ode w hen voltage to this pin is < 0.4 v and enabled w hen > 1.2 v. do not leave this pin floating. a2 v in input voltage . connect to input pow er source.
w ww.onsemi.com 3 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator absolute maximum ratings stresses exceeding the absolute maximum ratin gs may damage the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating condition s may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. units v in input voltage - 0.3 7.0 v v sw voltage on sw pin - 0.3 v in + 0.3 ( 3 ) v v ctrl en a n d mode pin voltage - 0 .3 v in + 0.3 ( 3 ) v other pins - 0.3 v in + 0.3 ( 3 ) v esd electrostatic discharge protection level human body model per jesd22 - a114 2.0 kv charged device model per jesd22 - c1 01 1 .5 t j junction te mperature - 40 +150 c t stg storage temperature - 65 +150 c t l lead soldering temperature, 10 seconds +260 c no t e : 3. lesser of 7 v or v in +0.3 v . recommended operating conditions the recommended operating conditions table defines the conditions for actua l device operation. recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. o n semiconductor does not recommend exceeding them or designing to absolute maximum ratings. symbol parameter min. typ. max. units v cc supply voltage range 2.3 5.5 v i out output current for fan5360 1 0 600 ma output current for fan5361 1 0 1 a l inductor 470 n h c in input capacitor 2.2 f c out output capacitor 1.6 4.7 12 .0 f t a operating ambient temperature - 40 +85 c t j operating junction temperature - 40 +125 c thermal properties junction - to - ambient thermal resistance is a function of application and board layout. this data is measured w ith four - layer 2 s 2p boards in accordance to jedec standard jesd51. special attenti on must be paid to not exceed junction temperature t j ( max) at a given ambient temperat ur e t a . symbol parameter typical unit ja junction - to - ambient thermal resistance 1 25 c/w
w ww.onsemi.com 4 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator electrical characteristics minimum and maximum values are at v in = v en = 2. 3 v to 5.5 v, v m od e = 0 v ( auto mode ) , t a = - 40c to +85c ; circuit of figure 1 , unless otherw ise noted. typical values are at t a = 25c, v in = v en = 3.6 v. sym bol parameter conditions min. typ. max. units pow er supplies i q quiescent current no l oad, not s w itching 24 50 a pwm mode 8 ma i (sd) shutdow n supply current en = gnd , v in = 3.6 v 0.25 1.00 a v uvlo under - voltage lockout threshold rising v in 2. 15 2. 2 7 v v uvhyst under - voltage lockout h ysteresis 200 mv logic inputs: en and mode p ins v ih enable high - level input voltage 1.2 v v i l enable low - level input voltage 0.4 v v lhyst logic i nput h ysteresis v oltage 100 mv i in enable input leakage current pin to v in or gnd 0.01 1.00 a sw itching and synchronization f s w sw itching frequency ( 4 ) v in = 3.6 v , t a = 25c , pwm mode , i load = 1 0 ma 5.4 6 .0 6.6 mhz f sync mode s ynchronization r ange ( 4 ) square wave a t mode i nput 1.3 1.5 1.7 mhz regulation v o output voltage accuracy 1.000 v i load = 0 to 600 m a 0.953 1.000 1.048 v pw m mode 0.967 1.000 1.034 1.35 v i load = 0 to 1 a 1.298 1.350 1.402 pwm mode 1.309 1.350 1.391 1.233 v i load = 0 to 1 a 1. 185 1.233 1.2 81 pwm mode 1. 192 1.233 1.2 74 1.820 v i load = 0 to 600 m a 1.7 55 1.820 1.8 8 5 pwm mode 1.7 81 1.82 0 1.8 59 1.100 v i load = 0 to 1 a 1.054 1.100 1.147 pwm mode 1.061 1.100 1.140 1.300 v i load = 0 to 1 a 1.250 1.300 1.350 pwm mode 1.259 1.300 1.341 1. 150 v i load = 0 to 1 a 1.104 1.150 1.196 pwm mode 1.110 1.150 1.190 1. 050 v i load = 0 to 600 m a 1.003 1.050 1.097 pwm mode 1.016 1.050 1.084 2. 050 v i load = 0 to 1 a , v in = 2.7 v to 5.5 v 1.973 2.050 2.127 pwm mode , v in = 2.7 v to 5.5 v 2.004 2.050 2.096 1.200 v i load = 0 to 1 a 1.152 1.200 1.248 pwm mode 1 .160 1.200 1.240 1.800 v i load = 0 to 1 a 1.732 1.800 1.868 pwm mode 1.756 1.800 1.844 t ss sof t - start v in = 4.5 v, from en rising edge 180 300 s
w ww.onsemi.com 5 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator electrical characteristics ( continued ) minimum and maximum values are at v in = v en = 2.3 v to 5.5 v, v m od e = 0 v ( auto mode), t a = - 40c to +85c; circuit of figure 1 , unless otherw ise noted. typical values are at t a = 25c, v in = v en = 3.6 v. sym bol parameter conditions min. typ. max. units output dr iver r ds(on) pmos on resistance v in = v gs = 3.6 v 175 m ? nmos on resistance v in = v gs = 3.6 v 165 m ? i lim(ol) pmos peak current limit open - loop for fan53601, v in = 3.6 v, t a = 25c 900 1100 1250 ma open - loop for fan53611, v in = 3.6 v, t a = 25c 1500 1750 2000 ma r dis output discharge resistance en = gnd 230 ? t tsd thermal shutdow n 150 c t hys thermal shutdow n hysteresis 15 c no t e s : 4. limited by the effect of t off m i nimum (see operation description section) . 5. the electrical characteristics table reflects open - l oo p d a ta. refer to the operation description and typical characteristics sections for closed - loop data.
w ww.onsemi.com 6 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator typical performance characteristics unless otherw ise noted , v in = v en = 3.6 v, v mode = 0 v (auto mode) , v out = 1.82 v, and t a = 25 c . 70% 75% 80% 85% 90% 95% 0 200 400 600 800 1000 efficiency load current (ma) 2.7 vin 3.6 vin 4.2 vin 5.0 vin 60% 62% 64% 66% 68% 70% 72% 74% 76% 78% 80% 82% 84% 86% 88% 90% 92% 0 200 400 600 800 1000 efficiency load current (ma) - 40c, auto +25c, auto +85c, auto - 40c, pwm +25c, pwm +85c, pwm figure 4. efficiency vs. load current and input volta ge, auto mode, dotted for d ecreasing l oad figure 5. efficiency vs. load current and temperature, auto mode, dotted for fpwm 64% 66% 68% 70% 72% 74% 76% 78% 80% 82% 84% 86% 88% 90% 0 200 400 600 800 1000 efficiency load current (ma) 2.7 vin 3.6 vin 4.2 vin 5.0 vin 60% 62% 64% 66% 68% 70% 72% 74% 76% 78% 80% 82% 84% 86% 88% 90% 0 200 400 600 800 1000 efficiency load current (ma) - 40c, auto +25c, auto +85c, auto - 40c, pwm +25c, pwm +85c, pwm figure 6. efficiency vs. load current and input voltage, v out = 1.23 v, auto mode, dotted for decreasing load figure 7. efficiency vs. load current and te mperature, v out = 1.23 v, auto mode, dotted for fpwm - 2 - 1 0 1 2 3 0 100 200 300 400 500 600 output regulation (%) load current (ma) 2.7vin, auto 3.6vin, auto 4.2vin, auto 5.0vin, auto 2.7vin, pwm 3.6vin, pwm 4.2vin, pwm 5.0vin, pwm 64% 66% 68% 70% 72% 74% 76% 78% 80% 82% 84% 86% 88% 90% 0 100 200 300 400 500 600 efficiency load current (ma) 2.7 vin 3.6 vin 4.2 vin 5.0 vin figure 8. output regulation vs. load current , v out = 1.00 v , do t t ed for auto mode figure 9. efficiency vs. load current , v out = 1.00 v, dotted for d ecreasing l oad
w ww.onsemi.com 7 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator typical performance characteristics (continued) un less otherw ise noted , v in = v en = 3.6 v, v mode = 0 v (auto mode) , v out = 1.82 v, and t a = 25 c . - 2 - 1 0 1 2 3 0 200 400 600 800 1000 output regulation (%) load current (ma) 2.7vin, auto 3.6vin, auto 4.2vin, auto 5.0vin, auto 2.7vin, pwm 3.6vin, pwm 4.2vin, pwm 5.0vin, pwm - 2 - 1 0 1 2 3 0 200 400 600 800 1000 output regulation (%) load current (ma) 2.7vin, auto 3.6vin, auto 4.2vin, auto 5.0vin, auto 2.7vin, pwm 3.6vin, pwm 4.2vin, pwm 5.0vin, pwm figure 10. ? v out (%) vs. load current and input voltage, n orm alized to 3.6 v in , 500 m a l oad, fpwm, d otted fo r auto m ode figure 11. ? v out ( %) vs. load current and input voltage, v out = 1.23 v , n orm alized to 3.6 v in , 500 m a l oad, fpwm, d otted for auto mode 50 100 150 200 250 300 350 2.5 3.0 3.5 4.0 4.5 5.0 5.5 load current (ma) input voltage (v) pwm pfm 50 100 150 200 250 300 350 2.5 3.0 3.5 4.0 4.5 5.0 5.5 load current (ma) input voltage (v) pwm pfm figure 12. pfm / pwm boundar y vs. input voltage figure 13. pfm / pwm boundary vs. input voltage, v out = 1.23 v 15 20 25 30 35 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input current ( - 40c, en=vin +25c, en=vin +85c, en=vin - 40c, en=1.8v +25c, en=1.8v +85c, en=1.8v 0 3 6 9 12 15 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input current (ma) input voltage (v) - 40c +25c +85c figure 14. quiescent current vs. input voltage and temperature, auto mode; en = v in s olid, d otted for en=1 . 8 v ( - 40 o c, +25 o c, +85 o c) figure 15. quiescent current vs. input voltage and temperature, mod e = en = v in (fpwm )
w ww.onsemi.com 8 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator typical performance characteristics (continued) unless otherw ise noted , v in = v en = 3.6 v, v mode = 0 v (auto mode) , v out = 1.82 v, and t a = 25 c . 0 5 10 15 20 25 0 200 400 600 800 1000 output ripple (mvpp) load current (ma) 2.7vin, auto 3.6vin, auto 5.0vin, auto 2.7vin, pwm 3.6vin, pwm 5.0vin, pwm 0 1,500 3,000 4,500 6,000 7,500 0 200 400 600 800 1000 switching frequency (khz) load current (ma) 2.7vin, auto 3.6vin, auto 5.0vin, auto 2.7vin, pwm 3.6vin, pwm 5.0vin, pwm figure 16. output ripple vs. load current and input voltage, fpwm, d otted for auto m ode figure 17. freque ncy vs. load current and input voltage, auto mode, d otted for fpwm figure 18. load transient, 10 - 200- 10 m a, 100 n s edge figure 19. load transient, 200 - 800- 200 m a, 100 n s edge figure 20. line transient, 3.3 - 3.9 - 3.3 v in , 10 s edge, 36 ma load figure 21. line transient, 3.3 - 3.9 - 3 .3 v in , 10 s edge, 600 ma load
w ww.onsemi.com 9 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator typical performance characteristics (continued) unless otherw ise noted , v in = v en = 3.6 v, v mode = 0 v (auto mode) , v out = 1.82 v, and t a = 25 c . figure 22. combined line / load transient, 3.9 - 3.3 v in , 10 s e dge, 36 - 400 m a load, 100 ns e dge figure 23. combined line / load transient, 3.3 - 3.9 v in , 10 s e dge, 400 - 36 m a load, 100 ns e dge figure 24. start up, 50 ? load figure 25. start up, 3 ? load figure 26. shut dow n, 10k ? load,
w ww.onsemi.com 10 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator typical performance chara cteristics (continued) unless otherw ise noted , v in = v en = 3.6 v, v mode = 0 v (auto mode) , v out = 1.82 v, and t a = 25 c . figure 28. ove r - c urrent , load i ncreasing p ast c urrent l im it , fan53601 figure 29. 250 m ? fault , r apid f ault, hiccup , fan53601 figure 30. ove r - c urrent, load i ncreasing p ast c urrent l im it, fan53611 figure 31. 250 m ? 20 30 40 50 60 70 0.1 1 10 100 1000 psrr (db) frequency (khz) 36ma load 600ma load 20 30 40 50 60 70 0.1 1 10 100 1000 psrr (db) frequency (khz) 24ma load 500ma load figure 32. psrr, 50 ? and 3 ? load figure 33. psrr, 50 ? and 3 ? load, v out = 1.23 v
w w w.onsemi.com 11 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator operation description the fan53601/11 is a 6 mhz , step - dow n sw itching voltage regulator ava ila ble i n 600 ma or 1 a options that delivers a fixed output from an input voltage supply of 2.3 v to 5.5 v . using a proprietary architecture w ith synchronous rectification, the fa n53601 /11 is capable of delivering a peak efficiency of 92%, w hile maintaining efficiency over 80% at load currents as low as 1 ma . the regulator operates at a nominal fixed frequency of 6 mhz , w hich reduces the value of the external components to as low as 470 n h for the output inductor and 4.7 f for the output capacitor. in addition, t he pwm modulator can be synchronized to an external frequency source. control scheme the fan53601/11 uses a proprietary, non - linear, fixed - frequency pwm modulator to deliver a fast load transient response, w hile maintaining a constant sw itching frequency o ver a w ide range of operating conditions. the regulator performance is independent of the output capacitor esr, allow ing for the use of ceramic output capacitors. although this type of operation nor mally results in a sw itching frequency that varies w ith input voltage and load current, an internal frequency loop holds the sw itching frequency constant over a large range of input voltages and load currents. for very light loads, the fan53601/11 operates in d iscontinuous c urrent mode ( dcm) s ing le - pulse pfm m od e , w hich produces low output ripple compared w ith other pfm architectures. transition betw een pwm and pfm is seamless, allow ing for a smooth transition betw een dcm and ccm. combined w ith exceptional transient response characteristics, the very low quiescent current of the controller maintains high efficiency; even at very light loads ; w hile preserving fast transient response for applications requiring tight output regulation. enable and soft - start when en is low, all circuits are off and the ic draw s ~2 50 n a of current. when en is h ig h and v in is above its uvlo threshold, the regulator begins a soft - start cycle. the output ramp during soft - start is a fixed slew rate of 50 mv / s f r om vout = 0 to 1 v, then 12.5 mv / s until the output reaches its setpoint. regardless of the state of the mode pin, pfm m ode is enabled to prevent current from being discharged f r om c out if soft - start begins w hen c out is charged. in addition, all voltage options can be ordered w ith a feature that actively discharges fb to ground through a 2 30 ? path w hen en is low . raising en above its threshold voltage activates the part and starts the soft - start cycle. during soft - start, the internal reference is ramped using an exponential rc shape to prevent overshoot of the output voltage. current limiting minimizes inrush during soft - start. the current - limit fault response protects the ic in the event of a n over - current condition present dur ing soft - start. as a result, the ic may fail to start if heavy load is applied during startup and/or if excessive c ou t is used. the current required to charge c out during soft - start commonly referred to as ?displacement current? is given as: dt dv ci out disp ?= <+ st a rtup i nto l arge c out mul tiple so ft - start cycles are require d f or no- loa d startup i f c out is greater than 15 f. large c out requires lig h t i n iti al loa d t o ensure the fa n5 3601/11 starts approp r iat e ly. th e ic shut s dow n f or 1.3 m s w hen i disp exceeds i limit f or mor e than 200 s of current lim i t. t he ic then beg ins a new s oft - start cycle. since c out retains its charge w hen the ic is o ff, the ic reaches regulation af ter m ultiple so ft- start atte m pts. m od e p in logic 1 on t his pin f orces the ic to stay in pw m m od e . a lo g ic 0 al low s the ic to aut o matic a ll y s w itch to pfm durin g li ght loads. if the mode pin is to ggl ed w ith a f requency betw een 1.3 mhz and 1 .7 mh z , the converter synchronizes its sw itching f requency t o f our times th e f requency on the mode pin. the mode pin is inter n ally buff ered w ith a s ch m itt trigger , w hich allo w s the mode pin t o be drive n w ith sl ow rise an d f all t i me s . an as ym me tric duty cycle f or f requency synchronizatio n is also perm itte d as lon g as the mi n im u m ti me belo w v il (max) or above v ih(max) is 100 ns. c urr e nt l imit, fault s hu tdow n, and r estart a heavy load or short circuit on t he out put causes t h e curren t in t he inducto r to increase un t il a maxi mum curren t thresh ol d is reached in the h igh- si de s w itch. u p on reaching t h is point , the h igh- si de s w itch turns o ff , preventing h ig h currents f rom causing d a mage. the reg u la t or contin u es to limit the curren t c yc le - by - cycle. a f ter 16 cycles of current limit , th e reg u lato r triggers an over - current f ault, causi n g the re g ula t or to shu t dow n f or about 1.3 m s bef ore atte m pting a restart. if the f ault i s caused by short circuit, the so ft - start circuit att emp ts to restart and produces an over - current f ault af ter about 200 s, w hich results in a dut y cycle o f less t han 15% , li m iting pow er dissipation . th e closed- loo p peak - curren t li m it is no t t h e sa me a s t he open- loop tested current limit, i lim(ol) , in the e lectrical c h aracteristics t a ble . t h is is pri mar ily due to th e eff ect of propagation delays o f the ic current li m it co m parator. under - vol t age lockout ( uvlo) when en is hig h , the under - volt age lockout ke e ps the par t f ro m o perating unt il th e i nput sup p ly volt age r ises hig h enoug h to prop erly operate . this ensures no misbeh avior of the regulator during startup or shutdown.
w w w.onsemi.com 12 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator thermal shutdown (tsd) when the die temperature increases, due to a high lo ad condition and/or a high ambient temperature ; the output sw itching is disabled until the d ie temperature fall s sufficiently. the junction temperature at w hich the thermal shutdow n activa tes is nominally 150c w ith a 15 c hysteresis. m inimum o ff -t ime e ffe ct on switching f re quency t off(min) is 40 ns. this imposes constraints on the maximum in out v v that the fa n53601 /11 can provide or the maximum output voltage it can provide at low v in w hile ma inta in ing a fixed sw itching frequency in pwm m ode . when v in is low , fixed sw itching is maintained as long as : 7.0 1 )( ?? sw minoff in out ft v v . the sw itching frequency drop s w hen the regulator cannot provide sufficient duty cycle at 6 mh z to maintain regulation. this occurs w hen v ou t is 1.82 v and v in is below 2.7 v at high load currents ( se e figure 34 ). 0 1,500 3,000 4,500 6,000 7,500 0 200 400 600 800 1000 switching frequency (khz) load current (ma) 2.7vin, auto 2.3vin, auto 2.7vin, pwm 2.3vin, pwm f igure 34. frequency vs. load current to d emonstrate t offmin e ffect, v in = 2.3 v and 2.7 v, v out = 1.82 v, auto mode, fpwm d otted the calculation for sw itching frequency is given b y: ? ? ? ? ? ? ? ? = mhz t f max sw sw 6 , 1 min )( (3) w here: ? ? ? ? ? ? ? ? ??? ?+ +?= out on out in off out out max sw vriv riv ns t 1 40 )( (4 ) w here: off r = l n dson dcr r + _ on r = l p dson dcr r + _
w ww.onsemi.com 13 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator applications informati on se le cting the inductor the output inductor must meet both the required inductance and the energy - handling capability of the application. the inductor value affects average current limit, the pwm - to - pfm transition point, output voltage ripple, and effic iency. the ripple current (?i) of the regulator is: ? ? ? ? ? ? ? ? ? ? ? ? sw out in in out f l v v v v i ( 5 ) the maximum average load current, i max (load), is related to the peak current limit, i lim(pk) , by the ripple current , given by : 2 i i i ) pk ( lim ) load ( max ? ? = ? = ? i increases, the rms current increases, as do the core and skin effect losses. 12 i i i 2 2 ) dc ( out rms ? + = output capacitor table 2 suggests 0402 capacitors. 0 603 capacitors may further improve performance in that the effective capacitance is higher. this improves transient response and output ripple. increasing c out has no effect on loop stability and can therefore be increased to reduce output voltage ripple or to improve transient response. output voltage ripple, ?v out , is: ( ) ? ? ? ? ? ? ? ? ? ? + ? ? ? ? ? ? = ? out sw 2 out sw l out c f 8 1 d 1 d 2 esr c f i v ( 9 ) input capacitor the 2.2 f ceramic input capacitor should be placed as close as possible betw een the v in pin and gnd to minimize the paras itic inductance. i f a long w ire is used to bring pow er to the ic, additional ?bulk? capacitance (electrolytic or tantalum) should be placed betw een c in and the pow er source lead to reduce the ringing that can occur betw een the inductance of the pow er source leads and c in . t he effective capacitance value decreases as v in increases due to dc b ias effects. table 1. effects of c hanges in i nductor v alue (from 470 n h r ecommended v alue) on r egulator p erform ance inductor value i max(load) v out transient response increase increase decrease degraded decrease decrease increase improved table 2. recommended passive component s and their v ariation d ue to dc b ias component description vendor min. typ. max. l1 470 nh , 2012,90 m, 1.1 a murata lqm21pnr 47 m c0 murata lqm21pnr54mg0 hitachi metals hlsi 201210r47 300 nh 470 nh 520 nh c in 2.2 f, 6.3 v, x5r, 0402 murata or equivalent grm155r60j225me15 grm188r60j225ke19d 1.0 f 2.2 f c out 4.7 f, x5r, 0402 murata or equivalent grm155r60g475m grm155r60e475me 760 1.6 f 4.7 f
w ww.onsemi.com 14 fan53601 / fan53611 ? 6 mhz 600 ma / 1 a synchronous buck regulator pcb layout guidelines there are only three external components: the inductor and the input and output capacitors. for any buck sw itcher ic, including the fan53601 /11 , it is important to place a low - es r input capacitor very close to th e ic, as show n in figure 35 . the input capacitor ensures good input decoupling, w hich helps reduce noise appearing at the output terminals and ensures that the control sections of the ic do not behave erratically due to excessi ve noise. this reduces sw itching cycle jitter and ensures good overall performance. it is important to place the common gnd of c in and c out as close as possible to the c2 terminal . t here is some f lexibility in moving the inductor f urther aw ay from the ic ; in th at case , v out should be considered at the c out terminal . figure 35. pcb layout guidance the following information applies to the wlcsp package dimensions on the next page: product - specific dime nsions d e x y 1.160 0.030 0.860 0.030 0.230 0.180
w ww.onsemi.com 15 fan53601 / fan53611 ? 6 mhz, 600 ma / 1 a synchronous buck regulator physical dimensions seating plane 0.06 c 0.05 c c side views notes: a. no jedec registration applies. b. dimensions are in millimeters. c. dimensions and tolerances per asmey14.5m, 1994. d. datum c, the seating plane is defined by the spherical crowns of the balls. e. package typical height is 586 microns 39 microns (547-625 microns). f. for dimensions d, e, x, and y see product datasheet. g. drawing filename: uc006acrev4. bottom view top view recommended land pattern (nsmd pad type) e d b a ball a1 index area a1 0.03 c 2x 0.03 c 2x 0.2080.021 0.3780.018 1 2 a b c 0.40 0.40 0.005 c a b (x) +/-0.018 (y) +/-0.018 ?0.2600.010 0.40 6x e d f f 0.40 (?0.20) cu pad (?0.30) solder mask opening f 0.625 0.547 figure 36. 6 - bump wlcsp, 0.4 mm pitch
w ww.onsemi.com 16 fan53601 / fan53611 ? 6 mhz, 600 ma / 1 a synchronous buck regulator on semiconductor and the on semiconductor log o are trademarks of semiconductor components industries, llc dba on semiconducto r or its subsidiaries in the united states and/or other countries. on semiconductor owns the rig hts to a number of patents, tradema rks, copyrig hts, trade secrets, and other intellectual property. a listing of on semiconductor?s product/patent coverag e may be accessed at www.onsemi.com/site/pdf/patent - marking .pdf. on semiconductor reserves the rig ht to make chang es without further noti ce to any products herein. on semiconductor makes no warranty, representation or g uarantee reg arding the suitability of its products for any par ticular purpose, nor does on semiconductor assume any liability arising out of the application or use of any pro duct or circuit, and specifically disclaims any and all liability, including without limitation special, conseq uential or inc idental damag es. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety req uirements or standards, reg ardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do var y in different applications and actual performance may vary o ver time. all operating parameters, including ?typicals? must be v alidated for each customer application by customer?s technical experts. on semiconductor does not convey an y license under its pa tent rig hts nor the rig hts of others. on semiconductor products are not desig ned, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar class ification in a foreig n jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semiconductor products for any such unintended or unauthorize d application, buyer shall indemnify and hold on semiconductor and its officers , employees, subsidiaries, affiliates, and distributors harmless ag ainst all claims, costs, damag es, and expenses, and reason able attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleg es that on semiconductor was neglig ent reg arding the desig n or manufacture of the part. on semiconductor is an eq ual opportunity/affirmative action employer. this literature is subject to all applicable copyrig ht laws and is not for resale in any manner. publication ordering information literature fulfillment: literature distribution center for on semiconductor 19521 e. 32nd pkwy, aurora, colorado 80011 usa phone : 303 - 675- 2175 or 800 - 344- 3860 toll free usa/canada fax : 303 - 675- 2176 or 800 - 344- 3867 toll free usa/canada email : orderlit@onsemi.com n. amer ic an technical support : 800 - 282- 9855 toll free usa/canada. eur ope, middle east and afr ica technical support : phone: 421 33 790 2910 japan customer focu s center phone: 81 - 3 - 5817- 1050 on semic onductor website : www.onsemi.com or der literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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