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product structure : silicon monolithic integrated circuit this product has no designed protection against radioactive ra ys 1/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 14 ? 001 5.5v to 28v input, 2ch synchronous buck dc/dc controller BD95602MUV general description BD95602MUV is a dual buck regulator controller with adjustable output voltage from1.0v to 5.5v and an input voltage range of 5.5 to 28v. high efficiency is achieved with an external synchronous nch-mosfet. h 3 reg tm , rohms advanced proprietary control method that uses constant on-time control to provide ultra high transient responses to load changes is used. sllm(simple light load mode) technology is added to improve efficiency with light loads giving high efficiency over a wide load range. in addition to the dual buck regulator controllers, here are 2 ldo regulators included that are fixed output voltage of 3.3v and 5.0v. other functions included are soft start, variable frequency, short circuit protection with timer latch, over voltage, and power good outputs. this buck regulator is optimal for high-current applications. features ? adjustable simple light load mode (sllm), quiet light load mode (qllm) , forced continuous mode. ? multifunctional protection circuit -settable over current protection (ocp) -thermal shut down (tsd) -under voltage lock out (uvlo) -over voltage protection (ovp) -short circuit protection with timer-latch (scp) ? 150khz to 500khz switching frequency. ? adjustable soft start. ? power good. ? dual linear regulator (5v/3.3v (total 50ma)). ? output discharge. ? reference voltage circuit (0.7v). applications ? fpga, pol power supply, mobile pc , desktop pc , lcd- tv , digital components, etc. key specifications ? input voltage range: 5.5v to 28 v ? output voltage range: 1.0v to 5.5v ? switching frequency: 150k to 500mhz(typ) ? operating temperature range: -20c to +85c package w(typ) x d(typ) x h(max) vqfn032v5050 5.00mm x 5.00mm x 1.00mm vqfn032v5050 datashee t downloaded from: http:///
2/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical application circuit 4 5 3 2 1 9 10 21 20 19 18 17 11 12 13 14 15 pgood1 en1 boot1 hg1 sw1 pgood2 en2 boot2 hg2 sw2 reg2 reg1 vin lg2 pgnd2 agnd ref fb2 fs2 ctl 2.5v en_3.3 BD95602MUV gnd pgnd u1 3.3v 7 8 6 16 24 23 22 31 30 29 28 27 26 25 32 ilim2 vo2 ss2 mctl2 fs1 fb1 ilim1 mctl1 ss1 pgnd1 lg1 vo1 l1 c9 c7 q1 q2 c5 r5 c3 c2 c1 c8 l2 c12 q3 q4 c6 r6 r7 c4 r8 r16 r26 r15 r25 c19 c29 en_2.5 reg2_3.3v reg1_5v +12v figure 1. application circuit pin configuration figure 2 . pin configuration u1 BD95602MUV 3 1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 24 23 22 21 20 19 18 17 32 31 30 29 28 27 26 25 pgnd1 lg1 sw2 hg2 boot2 pgood2 ss2 vo2 ilim2 sw1 hg1 boot1 pgood1 ss1 mctl1 ref mctl2 fs1 fb1 agnd ilim1 fb2 fs2 ct l reg2 reg1 vin lg2 pgnd2 fin vo1 en1 en2 downloaded from: http:///
3/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV pin descriptions pin no. pin name function 1 24 sw2 sw1 ground pin for high-side fet. the maximum voltage range of this p in is 30v. 2 23 hg2 hg1 h igh -side fet gate drive pin. 3 22 boot2 boot1 this is the power supply pin for h igh -side fet driver. the maximum voltage range to ground is to 35v, to sw pin is to 7v. in switching operations, the voltage swings from (vin+reg1) to reg1 by boot pin operation. 4 21 en2 en1 when en pin voltage is at least 2.3v, the status of the switching regula tor becomes active. conversely, the status switches off when en pin voltage goes lower than 0.8v. this pin is pulled down to agnd with 1m resist or . 5 20 pgood2 pgood1 if fb pin voltage is 15% or less of reference voltage, it will ou tput low level. the output format is o pen drain, so please connect pull-up resistance. 6 19 ss2 ss1 this is the setting pin for soft start. the rising time is dete rmined by the capacitor connected between ss and ground, and the fixed current inside ic after it is t he status of low in standby mode. it controls the output voltage till ss voltage catch up the ref pin to become the ss terminal voltage. 7 27 vo2 vo 1 this is the output discharge pin, and output voltage feedbac k pin for frequency setting. 8 17 ilim2 ilim1 this is the coil current limit setting pin. set the resist or which is connected in between ground. 9 ctl when ctl pin voltage is at least 2.3v, the status of the linear regulator reg1 and reg2 output becomes active. conversely, the status switches off when ctl pin voltage goes lower than 0.8v. the switching regulator doesn t become active when the status of ctl pin is low, if the status of en pin is high. this pin is pulled up to vin with 1m resist or . 10 15 fs2 fs1 frequency input . a resistor to ground will set the switching frequency. frequencies from 150khz to 500khz are possible. 11 14 fb2 fb1 this is the output voltage feedback pin. the ic controls reference voltage and fb terminal voltage are almo st same. 12 ref this is the output voltage setting pin. the ic controls reference voltage and fb terminal voltage are almo st same. 13 agnd ground input for control circuit. 16 18 mctl2 mctl1 this is the operation mode setting pin. if terminal voltage re aches less than 0.8v, it will be low level. if terminal voltage reaches more than 2.3v, it will be high level . this pin is pulled down to agnd with 300k resistor. input control mode mctl1 mctl2 low lo w
sllm low high qllm high low continuous pwm mode high high continuous pwm mode 25 32 pgnd1 pgnd2 this is the ground pin for low -side fet drive. 26 31 lg1 lg2 this is the low -side fet gate drive p in . it is operated in switching between reg1 to pgnd. on resistance of output stage when high, it is 2 ? and when low, it is 0.5 ? drive low -side fet gate with the high pace. 28 reg2 this is the output pin for 3.3v/50ma linear regulator (5v/3.3v (to tal 5 0m a )) . please connect 10f capacitor which characteristic is more than x5 r near the pin. 29 reg1 this is the output pin for 5v/50ma linear regulator (5v/3.3v (total 50ma )) . please connect 10f capacitor which characteristic is more than x5 r near the pin. 30 vin supply pin of h 3 reg tm control circuit and linear regulator. monitor input voltage and determine necessary on -time. as a result, this terminal voltage changes, and then the ic operation become unstable. please connect 10f capacitor which chara cteristic is more than x5r near the pin. fin fin this is the thermal pad. please connect to the ground. downloaded from: http:///
4/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV output condition table input output ctl en1 en2 reg1(5v) reg2(3.3v) dc/dc1 dc/dc2 low low low off off off off low low high off off off off low high low off off off off low high high off off off off high low low on on off off high low high on on off on high high low on on on off high high high on on on on * ctl pin is connected to vin pin with 1m resistor(pull up) internal ic. * en pin is connected to agnd pin with 1m resistor(pull down) internal ic . block diagram figure 3 . block diagram 3 2 1 31 32 22 23 24 26 25 11 6 8 short through protection circuit sllm tm block h 3 reg tm controller block timer timer 14 12 17 21 short through protection circuit sllm tm block h 3 reg tm controller block 4 30 29 18 reference block 5v reg thermal protection en1 ref fb1 10 15 13 rfs1 fs1 agnd pgnd1 lg1 sw1 hg1 boot1 pgnd2 lg2 sw2 hg2 boot2 vin vin vo2 adjustable vo1 adjustable reg1 reg1 reg1 reg1 cl1 scp1 ovp1 cl2 scp2 ovp2 mctl fs2 mctl fs1 en1 en2 short circuit protect scp2 ref short circuit protect scp1 cl1 over current protect cl2 over current protect tsd reg1 power good mctl sllm mode control reg1 5v reg1 mctl1 vin vin 5.5 28v ss2 fb2 fs2 en2 pgood1 19 ss1 over voltage protect ovp2 over voltage protect ovp1 ref 9 28 reg2 3.3v ctl 20 reg1 5 reg1 power good 7 vo2 reg2 pgood2 3.3v reg vo1 timer timer uvlo pgnd2 pgnd1 27 vo1 ref ilim1 ilim2 sw2 sw1 16 mctl2 downloaded from: http:///
5/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV absolute maximum ratings(ta = 25c) parameter symbol ra ting unit conditions terminal voltage v in , ctl, sw1, sw2 30 v note 1 en1, en2, pgood1, pgood2 vo1, vo2, mctl1, mctl2 6 v note 1, note 2 fs1, fs2, fb1, fb2, i lim1 , i lim2 , ss1, ss2, lg1, lg2, ref,reg2 reg1+0.3 v note 1 boot1, boot2 35 v note 1, note 2 boot1-sw1, boot2-sw2, hg1-sw1, hg2-sw2 7 v note 1, note 2 hg1 boot1+0.3 v note 1, note 2 hg2 boot2+0.3 v note 1, note 2 pgnd1, pgnd2 agnd0.3 v note 1, note 2 power dissipation1 pd1 0.38 w note 3 power dissipation2 pd2 0.88 w note 4 power dissipation3 pd3 3.26 w note 5 power dissipation4 pd4 4.56 w note 6 operating temperature range topr - 20 to +85 c storage temperature range tstg - 55 to +1 50 c junction temperature tjmax +150 c (note 1) not to exceed pd. (note 2) instantaneous surge voltage, back electromotive force and voltage under less than 10% duty cycle. (note 3) derating in done 3.0 mw/c for operating above ta 25 c (when dont mounted on a heat radi ation board). (note 4) derating in done 7.0 mw/c for operating above ta 25 c (mount on 1-layer 74.2mm x 74.2mm x 1.6mm board). surface heat dissipation copper foil:20.2 mm 2 . (note 5) derating in done 26.1 mw/c for operating above ta 25 c (mount on 4-layer 74.2mm x 74.2mm x 1.6mm board two sides heat dissipation copperfoil:20.2 mm 2 . 2 or 3-layer : heat dissipation copper foil : 5505mm 2 ). (note 6) derating in done 36.5 mw/c for operating above ta 25 c (mount on 4- la yer 74.2mm x 74.2mm x 1.6mm board) all layers heat dissipation copper foil:5505mm 2 . caution: operating the ic over the absolute maximum ratings may damage the ic. the damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. therefore, it is important to consi der circuit protection measures, such as adding a fuse, in case the ic is operated over the absolute maximum ratings. recommended operating conditions (ta=25 c ) parameter symbol min typ max unit conditions terminal voltage v in 5.5 - 28 v ctl -0.3 - 28 v en1, en2, mctl1, mctl2 -0.3 - 5.5 v boot1, boot2 4.5 - 33 v sw1, sw2 -0.3 - 28 v boot1-sw1, boot2-sw2, hg1-sw1, hg2-sw2 -0.3 - 5.5 v vo1, vo2, pgood1, pgood2 -0.3 - 5.5 v minimum on time t onmin - - 150 nsec this product should not be used in a radioactive environment. downloaded from: http:///
6/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV electrical characteristics (unless otherwise noted, ta = 25 c vin=12v, ctl=open, en1=en2=5v, fs1=fs2= 51k ) parameter symbol min typ max unit conditions vin standby current i stb 70 150 250 a en1= en2= 0v, ctl= 5v vin bias current i in 60 130 230 a vo1= 5v vin shut down m ode current i shd 6 12 18 a ctl= 0v ctl low voltage v ctll -0.3 - 0.8 v ctl high v ol tage v ctlh 2.3 - 28 v ctl bias current i ctl - 18 - 12 -6 a ctl= 0v en low voltage v enl -0.3 - 0.8 v en high voltage v enh 2.3 - 5.5 v en bias current i en - 3 6 a en= 3v 5v linear regulator -vin reg1 output voltage v reg1 4.90 5.00 5.10 v ireg1=1ma maximum current i reg1 50 - - ma ireg2= 0ma , ( note 7) line regulation r eg.i1 - 90 180 mv vin= 5.5 to 28v load regulation r eg.l1 - 30 50 mv ireg1= 0 to 30ma 3.3v linear regulator reg2 output voltage v reg2 3.27 3.30 3.33 v ireg2= 1ma maximum current i reg2 50 - - ma ireg1= 0ma , ( note 7) line regulation r eg.i2 - - 20 mv vin= 5.5 to 28v load regulation r eg.l2 - - 30 mv ireg2= 0 to 30ma 5v linear regulator -vo1 input threshold voltage r eg1th 4.1 4.4 4.7 v vo1: sweep up input delay time t reg1 1.5 3 6 ms switch resistance r reg1 - 1.0 3.0 ? under voltage lock out block reg1 threshold voltage r eg1 _ uvlo 3.9 4.2 4.5 v reg1: sweep up hysteresis voltage dv_ uvlo 50 100 200 mv reg1: sweep down output voltage sense block feedback voltage1 v fb1 0.693 0.700 0.707 v fb1 bias current i fb1 - 0 1 a fb1= ref output discharge resistance1 r disout1 50 100 200 ? feedback voltage2 v fb2 0.693 0.700 0.707 v fb2 bias current i fb2 - 0 1 a fb2= ref output discharge resistance2 r disout2 50 100 200 ? h 3 reg tm control block on time1 t on 1 0.760 0.910 1.060 s vo1= 5v,fs1= 51k ? on time2 t on 2 0.470 0.620 0.770 s vo2= 3.3v ,fs2= 51k ? maximum on time 1 t onmax 1 2.5 5 10 s vo1= 5v maximum on time 2 t onmax 2 1.65 3.3 6.6 s vo2= 3.3v minimum off time t offmin - 0.2 0.4 s fet driver block hg h igh side on resistance hg hon - 3.0 6.0 ? hg low side on resistance hg lon - 2.0 4.0 ? lg h igh side on resistance lg hon - 2.0 4.0 ? lg low side on resistance lg lon - 0.5 1.0 ? (note 7) i reg1 +i reg2 50ma. downloaded from: http:///
7/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV electrical characteristics (unless otherwise noted, ta = 25 c vin=12v, ctl=open, en1=en2=5v, fs1=fs2=51k ) over voltage protection block ovp threshold voltage v ovp 0.77 (+10%) 0.84 (+20%) 0.91 (+30%) v ovp hysteresis dv_ ovp 50 150 300 mv output short protection block scp threshold voltage v scp 0.42 (- 40%) 0.49 (- 30%) 0.56 (- 20%) v delay time t scp 0.4 0.75 1.5 ms over current protection block offset voltage dv smax 80 100 120 mv ilim= 100k ? power g ood block power g ood low threshold v pgthl 0.525 (- 25%) 0.595 (- 15%) 0.665 (- 5%) v power g ood l ow voltage v pgl - 0.1 0.2 v ipgood= 1ma delay time t pgood 0.4 0.75 1.5 ms power g ood leakage current i leakpg -2 0 2 a vpgood= 5v soft start block charge current i ss 1.5 2.3 3.1 a standby voltage v ss _ stb - - 50 mv mode control block mctl lo w voltage v mctl _ l -0.3 - 0.3 v mctl high voltage v mctl _ h 2.3 - reg1 +0.3 v mctl bias current i mctl 8 16 24 a mctl= 5v downloaded from: http:///
8/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves (reference data) figure 4. switching waveform (vo= 5v, io= 0a, pwm) figure 5. switching waveform (vo= 5v, io= 8a, pwm) figure 6. switching waveform (vo= 5v, io= 0a, qllm) figure 7. switching waveform (vo= 5v, io= 0a, sll m) 9pt hg 10v/div sw 10v/div lg 5v/div 2 s hg 10v/div sw 10v/div lg 5v/div 2 s hg 10v/div sw 10v/div lg 5v/div hg 10v/div sw 10v/div lg 5v/div 10 s 10 s downloaded from: http:///
9/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued figure 8. switching waveform (vo= 3.3v, io= 0a, pwm) figure 9. switching waveform (vo= 3.3v, io= 8a, pwm) figure 10. switching waveform (vo= 3.3v, io= 0a, qllm) figure 11. switching waveform (vo= 3.3v, io= 0a, sllm) hg 10v/div sw 10v/div lg 5v/div 2 s hg 10v/div sw 10v/div lg 5v/div 2 s hg 10v/div sw 10v/div lg 5v/div hg 10v/div sw 10v/div lg 5v/div 10 s 10 s downloaded from: http:///
10 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued figure 12. switching waveform (vo= 1v, io= 0a, pwm) figure 13. switching waveform (vo= 1v, io= 8a, pwm) figure 14. switching waveform (vo= 1v, io= 0a, qllm) figure 15. switching waveform (vo= 1v, io= 0a, sllm) hg 10v/div sw 10v/div lg 5v/div 2 s hg 10v/div sw 10v/div lg 5v/div 2 s hg 10v/div sw 10v/div lg 5v/div hg 10v/div sw 10v/div lg 5v/div 10 s 10 s downloaded from: http:///
11 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued 0 20 40 60 80 100 1 10 100 1000 10000 io[ma] [%] 0 20 40 60 80 100 1 10 100 1000 10000 io[ma] [%] 0 20 40 60 80 100 1 10 100 1000 10000 io[ma] [%] figure 16. efficiency (vo= 5v, pwm) figure 17. efficiency (vo= 5v, qllm) figure 18. efficiency (vo= 5v, sllm) figure 19. efficiency (vo= 3.3v, pwm) 7v 12v 21v 7v 12v 21v 7v 12v 21v 5v 0 20 40 60 80 100 1 10 100 1000 10000 io[ma] [%] 7v 12v 21v downloaded from: http:///
12 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued 0 20 40 60 80 100 1 10 100 1000 10000 [%] io[ma] 0 20 40 60 80 100 1 10 100 1000 10000 [%] io[ma] 0 20 40 60 80 100 1 10 100 1000 10000 [%] io[ma] 0 20 40 60 80 100 1 10 100 1000 10000 [%] io[ma] figure 20. efficiency (vo= 3.3v, qllm) figure 22. efficiency (vo= 1v, pwm) figure 23. efficiency (vo= 1v, qllm) 7v 12v 21v 7v 12v 21v 7v 12v 21v figure 21. efficiency (vo= 3.3v, sllm) 7v 12v 21v downloaded from: http:///
13 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued 0 20 40 60 80 100 1 10 100 1000 10000 [%] io[ma] figure 24. efficiency (vo= 1v, sllm) figure 26. transient response (vo= 5v, pwm, io= 8a 0a) figure 27. transient response (vo= 3.3v, pwm, io= 0a 8a) 12v 21v 7v figure 25. transient response (vo= 5v, pwm, io= 0a 8a) 20 s vo 100mv/div i l 5a/div i o 5a/div 20 s vo 100mv/div i l 5a/div i o 5a/div 20 s vo 100mv/div i l 5a/div i o 5a/div downloaded from: http:///
14 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued figure 28. transient response (vo= 3.3v, pwm, io= 8a 0a) figure 29. transient response (vo= 1v, pwm, io= 0a 8a) figure 30. transient response (vo= 1v, pwm, io= 8a 0a) figure 31. output voltage (vo= 5v, pwm, io= 0a) 20 s vo 100mv/div i l 5a/div i o 5a/div 20 s vo 100mv/div i l 5a/div i o 5a/div 20 s vo 100mv/div i l 5a/div i o 5a/div 2 s vo 50mv/div downloaded from: http:///
15 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued figure 32. output voltage (vo= 5v, pwm, io= 8a) figure 33. output voltage (vo= 5v, qllm, io= 0a) figure 34. output voltage (vo= 5v, sllm, io= 0a) figure 35. output voltage (vo= 3.3v, pwm, io= 0a) 2 s vo 50mv/d iv vo 50mv/div vo 50mv/div vo 50mv/div 2 s 2 s 10 s 2 s downloaded from: http:///
16 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued figure 36. output voltage (vo= 3.3v, pwm, io= 8a) figure 37. output voltage (vo= 3.3v, qllm, io= 0a) figure 38. output voltage (vo= 3.3v, sllm, io= 0a) figure 39. output voltage (vo= 1v, pwm, io= 0a) 2 s vo 50mv/div vo 50mv/div vo 50mv/div vo 50mv/div 2 s 10 s 2 s downloaded from: http:///
17 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued figure 40. output voltage (vo= 1v, pwm, io= 8a) figure 41. output voltage (vo= 1v, qllm, io= 0a) figure 42. output voltage (vo= 1v, sllm, io= 0a) figure 43. start- up (en1= en2) vo 50mv/div vo 50mv/div vo 50mv/div 2 s 10 s 2 s en1 5v/div vo1 2v/div en2 5v/div vo2 2v/div 400 s downloaded from: http:///
18 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued iout-frequency (vout=5v, r(fs)=68k ) 300 350 400 450 500 0 1 2 3 4 5 6 7 iout [a] frequency [khz] vin=7.5v vin=12v vin=18v figure 44. start- up (e n2 en1) figure 45. start- up (en1 en2) figure 46. start- up (en1/2 pg ood1/2) figure 47. io-frequency (vo= 5v, pwm, rfs= 8k) 40ms en1 5v/div vo1 2v/div en2 5v/div vo2 2v/div en1 5v/div vo1 2v/div en2 5v/div vo2 2v/div 40ms 40ms en1 5v/div pgood1 2v/div en2 5v/div pgood2 2v/div downloaded from: http:///
19 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued iout-frequency (vout=5v, r(fs)=68k ) 300 350 400 450 500 0 1 2 3 4 5 6 7 iout [a] frequency [khz] vin=7.5v vin=12v vin=18v 0 0.5 1 1.5 2 2.5 0 50 100 150 rfs [k ] ontime [usec] vout=5v vout=3.3v 0 100 200 300 400 500 600 700 0 50 100 150 rfs [k ] frequency [khz] vout=5v vout=3.3v 0.000 0.500 1.000 1.500 2.000 2.500 3.000 3.500 4.000 4.500 5.000 5.500 0 2 4 6 8 10 12 14 16 iout [a] vout [v] vin=75v(5 vin=v5 vin=75v(75 vin=v75 figure 48. lo-frequency (vo= 3.3v, pwm, rfs= 8k) figure 49. on time-rfs figure 50 . sw frequency-rfs figure 51. current limit (vo= 5v) downloaded from: http:///
20 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV typical performance curves - continued iout - reg2 voltage 2.8 2.9 3 3.1 3.2 3.3 3.4 0 50 100 150 200 250 iout [ma] reg2 voltage [v] iout - reg1 voltage 4.5 4.6 4.7 4.8 4.9 5 5.1 0 50 100 150 200 250 iout [ma] reg1 voltage [v] 0.000 0.500 1.000 1.500 2.000 2.500 3.000 3.500 0 2 4 6 8 10 12 14 16 iout [a] vout [v] vin=75v(5 vin=v5 vin=75v(75 vin=v75 figure 52. current limit (vo= 3.3v) figure 53. reg1 load regulation figure 54. reg2 load regulation downloaded from: http:///
21 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV description of block bd9 560 2muv is a dual channel synchronous buck regulator using h 3 reg tm , rohms latest constant on -time controller technology. fast load response is achieved by controllin g the output voltage using a comparator without relying on the switching frequency. when v out drops due to a rapid load change, the system quickly res tores v out by extending the t on time interval. thus, it serves to improve the regulator s transient response. activation of the light l oad m ode further increases efficiency by using simple light load mode (sllm) control. h 3 reg tm control (normal operation) (v out drops due to a rapid load change) (when v in drops) based on the value of v in , the on -time t on and off-time t off are determined by t on = v out / v in x i/f and t off = (v in - v out )/v in . as the v in voltage drops, in order to maintain the output voltage, t on becomes longer and t off is shorter. however, for normal operation, if v in drops further, t on is longer and t off = t minoff (minimum off- time is defined internally), the output voltage will decrease because t off cannot be any shorter than the minimum off-time. with h 3 reg tm , if v in goes even lower, the output voltage is maintained as the t on time is extended . (t on time is extended until fb>ref). in this case, the switching frequency is lowered so that the t on time can be extended. b a comparator for output voltage control internal reference voltage ref fb v out /v in circuit transient circuit driver hg sw lg v in v out fb ref hg lg hg output on -time is determined by the formula (1). when hg is off, lg is on until the output voltage becomes fb= ref. after the status of hg is off, lg go on outputting until output voltage become fb= ref. when fb falls to a reference voltage (ref), the drop is detected, activating the h 3 reg tm control system ref fb hg io lg t on + when v out drops due to a rapid load change, and the voltage remains below the output setting following the programmed t on time, the system quickly restores v out by extending the t on time, thus improving the transient response. once v out is restored, the controller continues normal operation. t on = v out v in x 1 f [sec] ??? ( 1) hg lg fb ref v in t on 1 t on 2 t on 3 t on 4 t off 1 t off 2 t off 3 t off 4 = t off 3 t on 4+ t off 4 = t off 3 h 3 reg tm fb=ref output voltage drops downloaded from: http:///
22 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV description of block - continued light load control (sllm) (q llm ) mctl1 mctl2 control m ode start- up l l sllm pwm l h qllm pwm h x pwm pwm fb ref hg lg 0a fb ref hg lg 0a the BD95602MUV operates in pwm mode until the ss input reaches the clamp voltage (2.5v), regardless of the control mode setting, this assures stable operation while the during soft start. load c out sllm will activate when the lg pin is off and the coil current i s near 0a (current flows from v out to sw). when the fb input is lower than the ref voltage again, hg will be enabled once again. qllm will activate when the lg pin is off and the coil current is near 0a (current flows from v out to sw). in this case, the next hg is prevented. then, when fb falls below the output programmed voltage within the programmed time (typ= 40 s), hg will resume. in the case where fb doesn t fall in the programmed time, lg is forced on causing v out to fall. as a result, the next hg is on. *attention: to effect the rapid transient response, the h 3 reg tm control monitors the current from the output capacitor to the load using the esr of the output capacitor do not use ceramic capacitors on c out side of power supply. ceramic bypass capacitors can be used near the individual loads if desired. downloaded from: http:///
23 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV timing chart ? soft start function soft start is exercised with the en pin set high. current control takes effect at startup, enabling a moderate output voltage ramping start. soft start timing and incoming current are calculated with formulas (2) and (3) below. ? soft start time ? inrush current (css: soft start capacitor co: output capacitor) c ss (pf) soft start time(ms) 18000 5 33000 10 68000 20 en ss v out iin t ss t ss = 0.7(typ) x c ss 2.3 a(typ) [sec] ??? ( 2) iin = co x v out t ss [a] ??? ( 3) x v out v in downloaded from: http:///
24 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV timing chart - continued ? notes when waking up with ctl pin or v in pin if en pin is high or short (or pull up resistor) to reg1 pin, ic starts up by switching ctl pin, the ic might fail to start up (scp function) with the reason below, please be careful of ss pin a nd ref pin capacitor capacity. ctl (vin) en reg1(5v) reg2(3.3v) scp_ref ss ref fb fb fb fb about 1.5v scp becomes valid from the point ss reached 1.5v. scp invalid for ss has not reached 1.5v. scp is valid here, because this is scp valid area and also because fb fall below scp_ref. scp will be effective with en =on at this section. sw start up ng en sw start up ok scp valid area scp is valid here,but with fb exceeding scp_ref it is normally activate-able area. scp is effective at scp_ref>fb condition. scp scp protection (function ) activates when output shorts and fb falls below the activation standard of scp. inclination of ref is influenced by the external condenserconnected to ref. ? to be accurate,delay occurs after scp activating. but this shows the relationship of each signals briefly. inner reference circuit delay scp pwm (switching control signal) 1ms(typ) scp circuit bg scp_ref scp ctl ref ss reg1 reg2 fb v in downloaded from: http:///
25/ 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV output discharge ? timer latch type output short circuit protection ? over voltage protection it will be available to use if connecting v out pin to dc/dc output. (about 100 ? ) . discharge function operates when <1> en = l <2> uvlo= on (if input voltage is low) <3> scp latch <4> tsd= on. the function at output discharge time is shown as left. [1] when switch to low from high with en pin. if en pin voltage is below than en threshold voltage, output discharge function is operated, and discharge output cap acitor charge. [2] when switch to low from high with en pin 1) ic is in normal operation until reg1 voltage becomes lower than uvlo voltage. however, because v in voltage also becomes low, output voltage will drop, too. 2) if reg1 voltage reaches the uvlo voltage, output discharge functi on is operated, and discharge output capacitor charge. 3) in addition, if reg1 voltage drops, inner ic logic cannot operate, s o that output discharge function does not work, and becomes output hi- z. (in case, fb has resistor against ground, discharge at the resistor. ) v in ,ctl en v out short protection is enabled when the output voltage falls to or below ref x 0.7. once the programmed time period has elapsed, the output is latched off to prevent destruction of the circuit. (hg= low, lg= low) output voltage can be restored either by cycling the en pin or disabling uvlo. fb hg lg ref x 1.2 switching when the output voltage increases to or above ref x 1.2(typ), output over voltage protection is enabled, and the low -side fet turns on to reduce the output. ( lg = high, hg = low). when the output falls to within normal operation , the function is restored to normal operation. fb scp en / uvlo ref x 0.7 0.75ms(typ) the efficiency of v in voltage drop output discharge v in , ctl reg1 v out output discharge output hi-z uvlo on downloaded from: http:///
26 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV ? over current protection circuit during normal operation, if fb is less than ref, hg is high during the time t on, but when the coil current exceeds the i limit threshold, hg is set to off. the next pulse returns to normal operation i f the output voltage drops after the maximum on-time or i l becomes lower than i limit. t on t on hg lg i l t on t on t off 1 t off 1 t off 1 t off ocp detection over current protection setting value downloaded from: http:///
27 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV selection of components externally connected 1. inductor (l) selection *passing a current larger than inductors rated current will cause magnetic saturation in the inductor and decrease system efficiency. in selecting the inductor, be sure to allow enough margin to assure that peak current does not exceed the inductor rated current value. *to minimize possible inductor damage and maximize efficie ncy, choose an inductor with a low (dcr, acr) resistance. 2. output capacitor (c o ) selection please give due consideration to the conditions in formula (7 ) below for the output capacit or , bearing in mind that the output start-up time must be established within the soft sta rt timeframe. capacitors used as bypass capacitors are connected to th e load side affect the overall output capacitance (c ext , figure above). please set the soft start time or over-current detection value, regarding these capacities. note : if an inappropriate capacitor is used, ocp may be detected durin g activation and may cause startup malfunctions. 3. input capacitor (cin) selection a ceramic capacitor is recommended to reduce esr loss and maximi ze efficiency. the inductor value is a major influence on the output ripple curren t. as formula (4) below indicates, the greater the inductor or the switching frequency, the lower the ripple current. i l = (v i in -v out ) x v out l x v in x f [ a] ??? ( 4) generally, lower inductance values offer faster response ti mes but also result in increased output ripple and lower efficiency. 0.47h to 2.2h are recommended as appropriate setting value. the peak current rating of coil is approximated by formula (5). please select inductor which is higher than this value. input capacitor output ripple current the output capacitor should be determined by equivalent series r esistance and equivalent series inductance so that the output ripple v oltage is 30mv or more. the rating of the capacitor is selected with sufficient margi n given the output voltage. v out = il x esr+esl x il / t on ??? ( 6) co+c ext t ss x (limit- i out ) v out ??? ( 7) t ss : soft start time limit : over current detection il : output ripple current esr : equivalent series resistance , esl : equivalent series inductance the input capacitor selected must have low enough esr to fully su pport high output ripple so as to prevent extreme over current conditions. the formula for ripple current irms is given in (8) below. irms= i out x v out (v in -v out ) v in [ a] ??? ( 8) where v in = 2 x v out , irms= i out 2 v in l co v out cin il v in i l l co v out v in l co v out esr output capacitor esl load c ext i lpeak = i outmax + (v in -v out ) x v out 2 x l x v in x f [ a] ??? ( 5) downloaded from: http:///
28 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV 4.mosfet selection the h igh -side mo sfet generates loss when switching, along with the loss due to on -resistance. good efficiency is achieved by selecting a mosfet with low on -resistance and low qg (gate total charge amount). recommended mosfets for various current values are as follows: ou tput current high-side mosfet low -side mosfet to 5a rq3e080gn rq3e100gn 5 to 8a rq3e120gn rq3e150gn 8 to 10a rq3e150gn rq3e180gn 5 . output voltage set point this ic operates such that output voltage is ref fb. *(notice)please set output ripple voltage more than 30mv to 50mv . (example) v in = 20v, v out = 5v, f= 300khz, l= 2.5h, esr= 20m , r1= 56k , r2= 9.1k h igh -side driver and low-side driver are designed to activate n channe l mosfet s with low on-resistance. the chosen mosfet may result in the loss described below, plea se select a pro per fet for each considering the input-output and load current. ( v out : output ripple voltage) ( i l : ripple current of coil) l: inductance[h] f: switching frequency[hz] v out = i l x esr i l =( v in - v out ) x v out (l x v in x f) v out = x ref(0.7v)+ v out (r 1+r2) r2 1 2 v out = 5a x 20 x 10 -3 = 0.1( v) v out = 0.7v x + x 0.1v=5.057( v) 1 2 ( 51k + 9.1k ) 9.1k pmain= p ron +p tran psyn= p ron < loss of high-side mosfet > (ron: on -resistance of fet f: switching frequency tr: rise time, tf: fall time) < loss of low-side mosfet > v out v in x r on x i out 2 + (tr+tf) x v in x i out x f 6 = ??? (9 ) v in -v out v in x r on x i out 2 = ??? (1 0) v in l co v out low-side monfet high-side mosfet pgnd pgnd i l =( 20v -5v) x =5( a) 5v (2.5 x 10 -6 h x 20v x 300 x 10 3 hz) ref fb h 3 reg controller s r q sllm driver circuit sllm v in output voltage v in r1 r2 downloaded from: http:///
29 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV 6. setting over current protection (example) if a load current 5a is desired with v in =6 to 19v , v out = 5v , f= 400 khz , l= 2.5h , r on =20m , the formula would be: when v in = 6v, i ocp will be minimum(this is because the ripple current is also minimum) so that if each condition is input, the formula will be the following: rilim<109.1[k ]. *to design the actual board, please consider enough margi n for fet on resistance variation , inductan ce variation, ic over current reference value variation , and frequency variation. 7. relation between output voltage and t on time for BD95602MUV, both channels, are high efficiency synchronous reg ulator controllers with variable frequency. t on time varies with input voltage [v in ], output voltage [v out ], and rfs of fs pin resistance. see figure 52 and figure 53 for t on time. figure55. rfs C ontime(v out = 5v) figure56. rfs C ontime(v out = 3.3v) from t on time, frequency on application condition is following: however, real-life considerations (such as the external mosfet gate c apacitor and switching speed) must be factored in as they affect the overall switching rise and fall ti me, so please confirm by experiment. the on resistance (between sw and pgnd) of the low side mosfet is used to set the over current protection. over current reference voltage (i lim_ref ) is determined as in formula(11) below. (r ilim : resistance for setting of over current voltage protection value[ k ] r on : low -side on resistance value of fet[m ]) 10k r ilim [k ] x r on [m ] i lim _ref = [ a] ??? (11) over current protection is actually determined by the formula (12) bel ow. i l :coil ripple current[a] v in :input voltage[v] v o :output voltage [v] f:switching frequency [h z ] l:inductance [h] coil current i ocp i lim_ref 0 0.5 1 1.5 2 2.5 0 20 40 60 80 100 120 ontime[us] rfs[k ] vin=7v vin=12v vin=21v 0 0.5 1 1.5 2 2.5 3 3.5 0 20 40 60 80 100 120 ontime[us] rfs[k ] vin=7v vin=1 2v vin=2 1v v out v in x 1 t on [khz] ??? (13) frequency = i l i lim _re f + i ocp = 1 2 i lim _ref + = x 1 2 i f v in - v o l x vo v in x ??? (12) v out v in l c o pgnd sw r ilim 10k r ilim [k ] r on [m ] i ocp = + x 1 2 i f v in C v o l x v o v in x > 5 downloaded from: http:///
30 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV application example (vin= 12v, vo1= 3.3v/8a, f1= 400khz, vo2= 2.5v/8a, f2= 400khz) 4 5 3 2 1 9 10 21 20 19 18 17 11 12 13 14 15 pgood1 en1 boot1 hg1 sw1 pgood2 en2 boot2 hg2 sw2 reg2 reg1 vin lg2 pgnd2 agnd ref fb2 fs2 ctl 2.5v en_3.3 BD95602MUV gnd pgnd u1 3.3v 7 8 6 16 24 23 22 31 30 29 28 27 26 25 32 ilim2 vo2 ss2 mctl2 fs1 fb1 ilim1 mctl1 ss1 pgnd1 lg1 vo1 l1 c9 c7 q1 q2 c5 r5 c3 c2 c1 c8 l2 c12 q3 q4 c6 r6 r7 c4 r8 r16 r26 r15 r25 c19 c29 en_2.5 reg2_3.3v reg1_5v +12v figure 57 . application example u1 BD95602MUV downloaded from: http:///
31 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV without any ripple (about 10mv), there is a possibility that the fb signal is not stable due to the adoption of the comparator co ntrol method. please ensure enough ripple voltage either by (1) reducing the l-value of inductor, or (2)using high esr output capacitor. ripple voltage can be generated in fb terminal by adding a capacitor in parallel to resistor (r17, r19) of the fb in put, but the circuit will be sensitive to noise from the output (vo 1/vo2) line and is not recommended. stability of the circuit is influenced by the layout of t he pcb, please pay careful attention to the layout. reference designator type value description manufacturer part number manufacturer configuration (mm) c1, c9, c10, c11, c12 ceramic capacitor 10f 35 v, x5r, 10% grm32er6ya106ka12 murata 3225 c2, c3, c4 ceramic capacitor 10f 16v, x5r, 10% grm21br61c106me15 murata 2012 c5, c6 ceramic capacitor 0.1f 16v, x5r, 10% grm155r61c104ka88 murata 1005 c7, c8 ceramic capacitor 0.47f 10v, x5r, 10% grm188r61a474ka61 murata 1608 c18, c19, c28, c29 poscap 330f 6.3v, 20%, esr 18mmax 6tpe330mil sanyo 7343 l1,l2 inductor 1h 20%,10a(l=-30%), dcr= 5.8 m 10% glmc1r003a alps 6565 q1, q3 mosfet - n-ch, vdss 30v, id 15a, ron 4.7m rq3e150gn rohm 3333 q2, q4 mosfet - n-ch, vdss 30v, id 18a, ron 3.3m rq3e180gn rohm 3333 r5, r6 resistor 2k 1/16w, 50v, 5% mcr01mzpj623 rohm 1005 r7, r8 resistor 1k 1/16w, 50v, 5% mcr01mzpj513 rohm 1005 r15 resistor 1k 1/16w, 50v, 0.5% mcr01mzpd1602 rohm 1005 r16 resistor 4.3k 1/16w, 50v, 0.5% mcr01mzpd4301 rohm 1005 r24 resistor 100 1/16w, 50v, 5% mcr01mzpj101 rohm 1005 r25 resistor 12k 1/16w, 50v, 0.5% mcr01mzpd1202 rohm 1005 r26 resistor 4.7k 1/16w, 50v, 0.5% mcr01mzpd4701 rohm 1005 u1 ic - buck dc/dc controller BD95602MUV rohm vqfn032v5050 downloaded from: http:///
32 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV power dissipation ambient temperature (ta) power dissipation (pd) 150 125 100 75 50 25 0 200 400 600 800 1000 [c] [mw] 880mw 380mw j-a= 142. c /w 85 74.2mm x 74.2mm x 1.6mm glass-epoxy pcb ic only j-a=328.9c/w downloaded from: http:///
33 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV i/o equivalence circuits 1, 24pin (sw2, sw1) 2, 23pin (hg2, hg1) 3, 22pin (boot2, boot1) 4, 21pin (en2, en1) 5, 20pin (pgood2, pgood1) 6, 19pin (ss2, ss1) 12pin (ref) 11, 14pin (fb2, fb1) 10, 15pin (fs2, fs1) 16, 18pin (mctl2, mctl 1) 9pin (ctl) 26, 31pin (lg1, lg2) sw hg hg boot boot boot sw reg1 50 1m reg1 reg1 vin 300k 100k 500k 1m downloaded from: http:///
34 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV i/o equivalence circuit(s) - continued 7, 27pin (vo2, vo1) 28pin (reg2) 29pin (reg1) 30pin (vin) 8, 17pin (ilim2, ilim1) 50 reg1 v in v in downloaded from: http:///
35 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV operational notes 1. reverse connection of power supply connecting the power supply in reverse polarity can damage the ic. take precautions against reverse polarity when connecting the power supply, such as mounting an extern al diode between the power supply and the ic s power supply pin s. 2. power supply lines design the pcb layout pattern to provide low impedance supply lines. separate the ground and supply lines of the digital and analog blocks to prevent noise in the groun d and supply lines of the digital block from affecting t he analog block. furthermore, connect a capacitor to ground at all power s upply pins . consider the effect of temperature and aging on the capacitance value when using electrolytic capa citors. 3. ground voltage ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition. 4. ground wiring pattern when using both small-signal and large-current ground tra ces, the two ground traces should be routed separately but connected to a single ground at the reference point of the a pplication board to avoid fluctuations in the small-sign al ground caused by large currents. also ensure that the ground traces of external components do not cause variations on the ground voltage. the ground lines must be as short and thick as possible to reduce line impedance. 5. thermal consideration should by any chance the power dissipation rating be ex ceeded the rise in temperature of the chip may result in deterioration of the properties of the chip. the absolute maximum rating of the pd stated in this specification is w hen the ic is mounted on a 70mm x 70mm x 1.6mm glass epoxy board. in case of exceeding this absolute maximum rating, increase the board size and copper area to prevent excee ding the pd rating. 6. recommended operating conditions these conditions represent a range within which the expec ted characteristics of the ic can be approximately obtained . the electrical characteristics are guaranteed under the condi tions of each parameter. 7. inrush current when power is first supplied to the ic, it is possible that the internal logic may be unstable and inrush current may flow instantaneously due to the internal powering sequence and dela ys, especially if the ic has more than one power supply. therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring, and routing of connection s. 8. operation under strong electromagnetic field operating the ic in the presence of a strong electromagnetic field ma y cause the ic to malfunction. 9. testing on application boards when testing the ic on an application board, connecting a capacitor directly to a low-impedance output pin may subject the ic to stress. always discharge capacitors comp letely after each process or step. the ics power supply should always be turned off completely before connecting or removing it from the test setup during the inspection process. to prevent damage from static discharge, ground t he ic during assembly and use similar precautions during transport and storage. 10. inter-pin short and mounting errors ensure that the direction and position are correct when mounti ng the ic on the pcb. incorrect mounting may result in damaging the ic. avoid nearby pins being shorted to each o ther especially to ground, power supply and output pin . inter-pin shorts could be due to many reasons such as metal parti cles, water droplets (in very humid environment) and unintentional solder bridge deposited in between pins during as sembly to name a few. downloaded from: http:///
36 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV operational notes C continued 11. unused input pins input pin s of an ic are often connected to the gate of a mos transistor . the gate has extremely high impedance and extremely low capacitance. if left unconnected, the elec tric field from the outside can easily charge it. the smal l charge acquired in this way is enough to produce a signi ficant effect on the conduction through the transistor and cause unexpected operation of the ic. so unless otherwise spec ified, unused input pins should be connected to the power supply or ground line. 12. regarding the input pin of the ic this monolithic ic contains p+ isolation and p substrate la yers between adjacent elements in order to keep them isolated. p-n junctions are formed at the intersection of t he p layers with the n layers of other elements, creating a parasitic diode or transistor. for example (refer to figure below): when gnd > pin a and gnd > pin b, the p-n junction operates as a paras itic diode. when gnd > pin b, the p-n junction operates as a parasitic transistor. parasitic diodes inevitably occur in the structure of the ic. the operation of parasitic diodes can result in mutua l interference among circuits, operational faults, or physic al damage. therefore, conditions that cause these diodes to operate, such as applying a voltage lower than the gnd vo ltage to an input pin (and thus to the p substrate) shoul d be avoided. figure 58 . example of monolithic ic structure 13. ceramic capacitor when using a ceramic capacitor, determine the dielectric co nstant considering the change of capacitance with temperature and the decrease in nominal capacitance due to dc bias a nd others. 14. area of safe operation (aso) operate the ic such that the output voltage, output current, and p ower dissipation are all within the area of safe operation (aso). 15. thermal shutdown circuit(tsd) this ic has a built-in thermal shutdown circuit that preven ts heat damage to the ic. normal operation should always be within the ics power dissipation rating. if however the ra ting is exceeded for a continued period, the junction temperature (tj) will rise which will activate the tsd circui t that will turn off all output pins. when the tj falls below the tsd threshold, the circuits are automatically restored to normal operation. note that the tsd circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under no circumstances, should the tsd circuit be used in a set des ign or for any purpose other than protecting the ic from heat damage. 16. over current protection circuit (ocp) this ic incorporates an integrated overcurrent protection circui t that is activated when the load is shorted. this protection circuit is effective in preventing damage due to sudden and unexpected incidents. however, the ic should not be used in applications characterized by continuous ope ration or transitioning of the protection circuit. n n p + p n n p + p substrate gnd n p + n n p + n p p substrate gnd gnd parasitic elements pin a pin a pin b pin b b c e parasitic elements gnd parasitic elements c be transistor (npn) resistor n region close-by parasitic elements downloaded from: http:///
37 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV ordering information b d 9 5 6 0 2 m u v - e 2 part number package muv : vqfn packaging and forming specification e2: embossed tape and reel (vqfn032v5050) marking diagrams vqfn032v5050 (top view) d 9 5 6 0 2 part number marking lot number 1pin mark downloaded from: http:///
38 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV physical dimension, tape and reel information package name vqfn032v5050 downloaded from: http:///
39 / 39 tsz02201-0j1j0az00530-1-2 ? 2013 rohm co., ltd. all rights reserved. 26.jun.2015 rev.002 www.rohm.co.jp tsz22111 ? 15 ? 001 BD95602MUV revision history date revision changes 6.sep.2013 001 new release 26. jun.2015 002 p.31 change the description of l1,l2 downloaded from: http:///
datasheet d a t a s h e e t notice-pga-e rev.001 ? 2015 rohm co., ltd. all rights reserved. notice precaution on using rohm products 1. our products are designed and manufac tured for application in ordinary elec tronic equipments (such as av equipment, oa equipment, telecommunication equipment, home electroni c appliances, amusement equipment, etc.). if you intend to use our products in devices requiring ex tremely high reliability (such as medical equipment (note 1) , transport equipment, traffic equipment, aircraft/spacecra ft, nuclear power controllers, fuel c ontrollers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (?specific applications?), please consult with the rohm sale s representative in advance. unless otherwise agreed in writing by rohm in advance, rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ro hm?s products for specific applications. (note1) medical equipment classification of the specific applications japan usa eu china class class class b class class ? class 2. rohm designs and manufactures its products subject to strict quality control system. however, semiconductor products can fail or malfunction at a certain rate. please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe desi gn against the physical injury, damage to any property, which a failure or malfunction of our products may cause. the following are examples of safety measures: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. our products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditio ns, as exemplified below. accordin gly, rohm shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of an y rohm?s products under any special or extraordinary environments or conditions. if you intend to use our products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] use of our products in any types of liquid, incl uding water, oils, chemicals, and organic solvents [b] use of our products outdoors or in places where the products are exposed to direct sunlight or dust [c] use of our products in places where the products ar e exposed to sea wind or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use of our products in places where the products are exposed to static electricity or electromagnetic waves [e] use of our products in proximity to heat-producing components, plastic cords, or other flammable items [f] sealing or coating our products with resin or other coating materials [g] use of our products without cleaning residue of flux (ev en if you use no-clean type fluxes, cleaning residue of flux is recommended); or washing our products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] use of the products in places subject to dew condensation 4. the products are not subjec t to radiation-proof design. 5. please verify and confirm characteristics of the final or mounted products in using the products. 6. in particular, if a transient load (a large amount of load applied in a short per iod of time, such as pulse. is applied, confirmation of performance characteristics after on-boar d mounting is strongly recomm ended. avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading c ondition may negatively affect product performance and reliability. 7. de-rate power dissipation (pd) depending on ambient temper ature (ta). when used in seal ed area, confirm the actual ambient temperature. 8. confirm that operation temperat ure is within the specified range described in the product specification. 9. rohm shall not be in any way responsible or liable for fa ilure induced under deviant condi tion from what is defined in this document. precaution for mounting / circuit board design 1. when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the resi due of flux may negatively affect product performance and reliability. 2. in principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must be used on a through hole mount products. if the flow sol dering method is preferred on a surface-mount products, please consult with the rohm representative in advance. for details, please refer to rohm mounting specification downloaded from: http:///
datasheet d a t a s h e e t notice-pga-e rev.001 ? 2015 rohm co., ltd. all rights reserved. precautions regarding application examples and external circuits 1. if change is made to the constant of an external circuit, pl ease allow a sufficient margin considering variations of the characteristics of the products and external components, including transient characteri stics, as well as static characteristics. 2. you agree that application notes, re ference designs, and associated data and in formation contained in this document are presented only as guidance for products use. theref ore, in case you use such information, you are solely responsible for it and you must exercise your own indepen dent verification and judgment in the use of such information contained in this document. rohm shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution in your manufacturing process and storage so that voltage exceeding t he products maximum rating will not be applied to products. please take special care under dry condit ion (e.g. grounding of human body / equipment / solder iron, isolation from charged objects, se tting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1. product performance and soldered connections may deteriora te if the products are stor ed in the places where: [a] the products are exposed to sea winds or corros ive gases, including cl2, h2s, nh3, so2, and no2 [b] the temperature or humidity exceeds those recommended by rohm [c] the products are exposed to di rect sunshine or condensation [d] the products are exposed to high electrostatic 2. even under rohm recommended storage c ondition, solderability of products out of recommended storage time period may be degraded. it is strongly recommended to confirm sol derability before using products of which storage time is exceeding the recommended storage time period. 3. store / transport cartons in the co rrect direction, which is indicated on a carton with a symbol. otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. use products within the specified time after opening a humidity barrier bag. baking is required before using products of which storage time is exceeding the recommended storage time period. precaution for product label qr code printed on rohm products label is for rohm?s internal use only. precaution for disposition when disposing products please dispose them proper ly using an authorized industry waste company. precaution for foreign exchange and foreign trade act since concerned goods might be fallen under listed items of export control prescribed by foreign exchange and foreign trade act, please consult with rohm in case of export. precaution regarding intellectual property rights 1. all information and data including but not limited to application example contained in this document is for reference only. rohm does not warrant that foregoi ng information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. 2. rohm shall not have any obligations where the claims, actions or demands arising from the co mbination of the products with other articles such as components, circuits, systems or external equipment (including software). 3. no license, expressly or implied, is granted hereby under any intellectual property rights or other rights of rohm or any third parties with respect to the products or the informati on contained in this document. pr ovided, however, that rohm will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to manufacture or sell products containing the produc ts, subject to the terms and conditions herein. other precaution 1. this document may not be reprinted or reproduced, in whol e or in part, without prior written consent of rohm. 2. the products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of rohm. 3. in no event shall you use in any wa y whatsoever the products and the related technical information contained in the products or this document for any military purposes, incl uding but not limited to, the development of mass-destruction weapons. 4. the proper names of companies or products described in this document are trademarks or registered trademarks of rohm, its affiliated companies or third parties. downloaded from: http:///
datasheet datasheet notice ? we rev.001 ? 201 5 rohm co., ltd. all rights reserved. general precaution 1. before you use our pro ducts, you are requested to care fully read this document and fully understand its contents. rohm shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny rohms products against warning, caution or note contained in this document. 2. all information contained in this docume nt is current as of the issuing date and subj ec t to change without any prior notice. before purchasing or using rohms products, please confirm the la test information with a rohm sale s representative. 3. the information contained in this doc ument is provi ded on an as is basis and rohm does not warrant that all information contained in this document is accurate an d/or error-free. rohm shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. downloaded from: http:///

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