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1/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. high performance regulators for pcs main power supply for notebook pcs (with built-in linear regulator) BD9528AMUV description BD9528AMUV is a 2ch switching regulator controller with high output current which can achieve low output voltage (1.0v 5.5v) from a wide input voltage range (5.5v 28v). high efficiency for the switching regul ator can be realized by utilizing an external n-mosfet power transistor. a new technology called h 3 reg tm (high speed, high efficiency, high performance) is a rohm proprietary control method to realize ultra high trans ient response against load c hange. sllm (simple light load mode) technology is also integrated to improve efficiency in light load mode, providing high efficiency over a wide load range. for protection and ease of use, 2ch ldo (5v/ 3.3v (total 100ma)), the soft start func tion, variable frequency function, short circuit protection function with timer latch, over voltage prot ection, and power good function are all built in. this switching regulator is specially designed for main power supply of laptop pc. features 1) 2ch h 3 reg tm dc/dc converter controller 2) adjustable simple light load mode (sllm), qu iet light load mode (qllm) and forced continuous mode 3) ther mal shut down (tsd), under voltage lockout (uvlo), over current protection (ocp), over voltage protection (ovp), short circui t protection with 0.75ms timer-latch (scp) 4) soft start function to minimize rush current during startup 5) switching frequency variable (f=150khz 500khz) 6) built-in power good circuit 7) built-in 2ch linear regu lator (5v/3.3v (total 100ma)) 8) built in reference voltage(0.7v) 9) vqfn032-v5050 package 10) built-in boot-di 11) built-in output discharge 12) esd susceptibility ( hbm (human body model) : 2kv, mm (machine model) : 200v ) applications laptop pc, desktop pc, lcd-tv, digital components no.11030jat46 www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 2/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV maximum absolute ratings (ta=25 ) parameter symbol limits unit terminal voltage vin, ctl, sw1, sw2 30 * 1 * 2 v en1, en2, pgood1, pgood2 vo1, vo2, mctl1, mctl2 6 * 1 * 2 v fs1, fs2, fb1, fb2, ilim1, ilim2, ss1, ss2, lg1, lg2, ref,reg2 reg1+0.3 * 1 v boot1, boot2 35 * 1 * 2 v boot1-sw1, bo ot2-sw2, hg1-sw1, hg2-sw2 7 * 1 * 2 v hg1 boot1+0.3 * 1 * 2 v hg2 boot2+0.3 * 1 * 2 v pgnd1, pgnd2 agnd 0.3 * 1 * 2 v power dissipation1 pd1 0.38 * 3 w power dissipation2 pd2 0.88 * 4 w power dissipation3 pd3 3.26 * 5 w power dissipation4 pd4 4.56 * 6 w operating temperature range topr -20 +100 storage temperature range tstg -55 +150 junction temperature tjmax +150 *1 do not however exceed pd. *2 instantaneous surge voltage, back electromotive force and voltage under less than 10% duty cycle. *3 reduced by 3.0mw for each increase in ta of 1 over 25 (when don?t mounted on a heat radiation board ) *4 reduced by 7.0mw for increase in ta of 1 over 25 . (when mounted on a board 74.2mm 74.2mm 1.6mm glass-epoxy pcb which has 1 layer. (copper foil area : 20.2mm 2 ) *5 reduced by 26.1mw for increase in ta of 1 over 25 . (when mounted on a board 74.2mm 74.2mm 1.6mm glass-epoxy pcb which has 4 layers. (1 st and 4 th copper foil area : 20.2mm 2 , 2 nd and 3 rd copper foil area : 5505mm 2 ) *6 reduced by 36.5mw for increase in ta of 1 over 25 . (when mounted on a board 74.2mm 74.2mm 1.6mm glass-epoxy pcb which has 4 layers. (all copper foil area : 5505mm 2 ) operating conditions (ta=25 ) parameter symbol min. max. unit terminal voltage vin 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, bo ot2-sw2, hg1-sw1, hg2-sw2 -0.3 5.5 v vo1, vo2, pgood1, pgood2 -0.3 5.5 v min on time tonmin - 150 nsec this product should not be used in a radioactive environment. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 3/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV electrical characteristics (unless otherwise noted, ta = 2 5 vin=12v, ctl=open, en1=en2=5v, fs1=fs2=51k ) parameter symbol limits unit condition min. typ. max. vin standby current istb 70 150 250 a en1=en2=0v, ctl=5v vin bias current iin 60 130 230 a vo1=5v vin shut down mode current ishd 6 12 18 a ctl=0v ctl low voltage vctll -0.3 - 0.8 v ctl high voltage vctlh 2.3 - 28 v ctl bias current ictl -18 -12 -6 a ctl=0v en low voltage venl -0.3 - 0.8 v en high voltage venh 2.3 - 5.5 v en bias current ien - 3 6 a en=3v [5v linear regulator](vin) reg1 output voltage vreg1 4. 90 5.00 5.10 v ireg1=1ma maximum current ireg1 100 - - ma ireg2=0ma* line regulation reg.l1 - 90 180 mv vin=5.5 to 28v load regulation reg.l1 - 30 50 mv ireg1=0 to 30ma [3.3v linear regulator] reg2 output voltage vreg2 3. 27 3.30 3.33 v ireg2=1ma maximum current ireg2 100 - - ma ireg1=0ma* line regulation reg.l2 - - 20 mv vin=5.5 to 28v load regulation reg.l2 - - 30 mv ireg2=0 to 30ma [5v linear regulator](vo1) input threshold voltage reg1th 4.1 4.4 4.7 v vo1: sweep up input delay time treg1 1.5 3 6 ms switch resistance rreg1 - 1.0 3.0 ? [under voltage lock out block] reg1 threshold voltage reg1_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 vfb1 0.693 0.700 0.707 v fb1 bias current ifb1 - 0 1 a fb1=ref output discharge resistance1 rdisout1 50 100 200 ? feedback voltage2 vfb2 0.693 0.700 0.707 v fb2 bias current ifb2 - 0 1 a fb2=ref output discharge resistance2 rdisout2 50 100 200 ? * ireg1+ireg2 Q100ma www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 4/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV electrical characteristics (unless otherwise noted, ta = 2 5 vin=12v, ctl=open, en1=en2=5v, fs1=fs2=51k ) parameter symbol limits unit condition min. typ. max. [h 3 reg block] ontime1 ton1 0.760 0.910 1.060 s vo1= 5v ontime2 ton2 0.470 0.620 0.770 s vo2= 3.3v maximum on time 1 tonmax1 2.5 5 10 s vo1= 5v maximum on time 2 tonmax2 1.65 3.3 6.6 s vo2= 3.3v minimum off time toffmin - 0.2 0.4 s [fet driver block] hg higher side on resistor hghon - 3.0 6.0 ? hg lower side on resistor hglon - 2.0 4.0 ? lg higher side on resistor lghon - 2.0 4.0 ? lg lower side on resistor lglon - 0.5 1.0 ? [over voltage protection block] ovp threshold voltage vovp 0.77 (+10%) 0.84 (+20%) 0.91 (+30%) v ovp hysteresis dv_ovp 50 150 300 mv [short circuit protection block] scp threshold voltage vscp 0.42 (-40%) 0.49 (-30%) 0.56 (-20%) v delay time tscp 0.4 0.75 1.5 ms current limit protection block] offset voltage dvsmax 80 100 120 mv ilim=100k [power good block] power good low threshold vpgthl 0.525 (-25%) 0.595 (-15%) 0.665 (-5%) v power good low voltage vpgl - 0.1 0.2 v ipgood=1ma delay time tpgood 0.4 0.75 1.5 ms power good leakage current ileakpg -2 0 2 a vpgood=5v [soft start block] charge current iss 1.5 2.3 3.1 a standby voltage vss_stb - - 50 mv [mode control block] mctl low voltage vmctl_l -0.3 - 0.3 v mctl high voltage vmctl_h 2.3 - reg1 +0.3 v mctl bias current imctl 8 16 24 a mctl=5v www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 5/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV 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, application circuit 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 time r timer 14 12 17 21 sho rt th roug h protection ci rcuit sl l m tm block h 3 reg tm controller block 4 30 29 18 reference bl o c k 5v reg thermal protection en1 ref fb1 10 15 13 rfs1 fs1 a gnd pgnd1 lg1 sw1 hg1 boot1 pg nd2 lg 2 sw2 hg2 boot2 vin vin vo 2 a djustable vo1 a djustable reg1 reg1 reg1 reg1 cl1 scp1 ovp 1 cl2 scp2 ovp2 mctl fs2 mct l fs1 en 1 en 2 short circuit protect scp2 ref short circuit protect scp1 cl1 over current protect cl2 over current protect tsd reg1 power good mctl sllm mode c ontrol reg1 5v reg1 mct l1 vin vin 5.5 28v s s2 fb2 fs2 en2 pgood1 19 ss 1 over voltage protect ovp2 over voltage protect ovp1 ref 9 28 reg2 3.3v ct l 20 reg 1 5 reg 1 power good 7 vo2 reg 2 pg oo d2 3.3v reg vo 1 timer ti mer uvlo pgnd2 pgnd1 27 vo 1 ref ilim1 i lim2 sw 2 sw1 16 mct l 2 www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 6/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV pin configuration input control mode mctl1 mctl2 low low sllm low high qllm high low forced continuous mode high high forced continuous mode pin function table pin no. pin name pin function 1 sw2 highside fet source pin 2 2 hg2 highside fet gate drive pin 2 3 boot2 hg driver power supply pin 2 4 en2 vo2 on/off pin (high=on, low,open=off) 5 pgood2 vo2 power good open drain output pin 6 ss2 vo2 soft start pin 7 vo2 vo2 output voltage sense pin 8 ilim2 ocp setting pin 2 9 ctl linear regulator on/off pin (high,open=on, low=off) 10 fs2 input pin for setting vo2 frequency 11 fb2 vo2 output voltage feedback pin 12 ref output voltage setting pin 13 agnd input pin ground 14 fb1 vo1 output voltage feedback pin 15 fs1 input pin for setting vo1 frequency 16 mctl2 mode switch pin 2 ( open = l ) 17 ilim1 ocp setting pin 1 18 mctl1 mode switch pin 1 ( open = l ) 19 ss1 vo1 soft start pin 20 pgood1 vo1 power good open drain output pin 21 en1 vo1 on/off pin (high=on, low,open=off) 22 boot1 hg driver power supply pin 23 hg1 highside fet gate drive pin 1 24 sw1 highside fet source pin 1 25 pgnd1 lowside fet source pin 1 26 lg1 lowside fet gate drive pin 1 27 vo1 vo1 output voltage sense pin 28 reg2 3.3v linear regulator output pin 29 reg1 5v linear regulator output pin 30 vin power supply input pin 31 lg2 lowside fet gate drive pin 2 32 pgnd2 lowside fet source pin 2 reverse fin exposed pad1, connect to gnd 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 a gnd ilim1 fb2 fs2 ctl reg2 reg1 vin lg2 pgnd2 fin vo1 en1 en2 mctl pin is connected to agnd pin with 500k resistor ( pull down) internal ic www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 7/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV reference data fig.1 switching waveform (vo=5v, io=0a, pwm) fig.2 switching waveform (vo=5v, io=8a, pwm) fig.3 switching waveform (vo=5v, io=0a, qllm) fig.4 switching waveform (vo=5v, io=0a, sllm) fig.5 switching waveform (vo=3.3v, io=0a, pwm) fig.6 switching waveform (vo=3.3v, io=8a, pwm) fig.7 switching waveform (vo=3.3v, io=0a, qllm) fig.8 switching waveform (vo=3.3v, io=0a, sllm) fig.9 switching waveform (vo=1v, io=0a, pwm) fig.10 switching waveform (vo=1v, io=8a, pwm) fig.11 switching waveform (vo=1v, io=0a, qllm) fig.12 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 10 s 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 2 s hg 10v/div sw 10v/div lg 5v/div 10 s hg 10v/div sw 10v/div lg 5v/div 2 s hg 10v/div sw 10v/div lg 5v/div 10 s hg 10v/div sw 10v/div lg 5v/div 10 s hg 10v/div sw 10v/div lg 5v/div 2 s hg 10v/div sw 10v/div lg 5v/div 10 s hg 10v/div sw 10v/div lg 5v/div 10 s www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 8/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV reference data 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] [%] 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] [%] 0 20 40 60 80 100 1 10 100 1000 10000 io[ma] [%] fig.13 efficiency (vo=5v, pwm) fig.14 efficiency (vo=5v, qllm) fig.15 efficiency (vo=5v, sllm) fig.16 efficiency (vo=3.3v, pwm) fig.17 efficiency (vo=3.3v, qllm) fig.18 efficiency (vo=3.3v, sllm) fig.19 efficiency (vo=1v, pwm) fig.20 efficiency (vo=1v, qllm) fig.21 efficiency (vo=1v, sllm) fig.22 transient response (vo=5v, pwm, io=0 8a) fig.23 transient response (vo=5v, pwm, io=8 0a) fig.24 transient response (vo=3.3v, pwm, io=0 8a) 7v 12v 21v 7v 12v 21v 7v 12v 21v 7v 12v 21v 7v 12v 21v 7v 12v 21v 7v 12v 21v 5v 7v 12v 21v 21v 12v 7v 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 20 s www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 9/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV reference data fig.25 transient response (vo=3.3v, pwm, io=8 0a) fig.26 transient response (vo=1v, pwm, io=0 8a) fig.27 transient response (vo=1v, pwm, io=8 0a) fig.28 output voltage (vo=5v, pwm, io=0a) fig.29 output voltage (vo=5v, pwm, io=8a) fig.30 output voltage (vo=5v, qllm, io=0a) fig.31 output voltage (vo=5v, sllm, io=0a) fig.32 output voltage (vo=3.3v, pwm, io=0a) fig.33 output voltage (vo=3.3v, pwm, io=8a) fig.34 output voltage (vo=3.3v, qllm, io=0a) fig.35 output voltage (vo=3.3v, sllm, io=0a) fig.36 output voltage (vo=1v, pwm, io=0a) 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 50mv/div 10 s vo 100mv/div i l 5a/div i o 5a/div 20 s vo 50mv/div 2 s vo 50mv/div 2 s vo 50mv/div 2 s vo 50mv/div 2 s vo 50mv/div 2 s vo 50mv/div 10 s vo 50mv/div 2 s vo 50mv/div 2 s www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 10/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV reference data fig.37 output voltage (vo=1v, pwm, io=8a) fig.38 output voltage (vo=1v, qllm, io=0a) fig.39 output voltage (vo=1v, sllm, io=0a) vo 50mv/div 2 s vo 50mv/div 10 s vo 50mv/div 2 s fig.43 wake up waveform (en1/2 pgood1/2) fig.44 io-frequency (vo=5v, pwm, rfs=68k ) fig.45 io-frequency (vo=3.3v, pwm, rfs=68k ) fig.46 fs-ontime fig.48 ta-i ocp (vo=5v) fig.47 fs-frequency fig.40 wake up waveform (en1=en2) fig.41 wake up waveform (en2en1) fig.42 wake up waveform (en1en2) iout-frequency (vout=5v, r(fs)=68k) 300 350 400 450 500 01234567 iout [a] frequency [khz] vin=7.5v vin=12v vin=18v iout-frequency (vout=5v, r(fs)=68k) 300 350 400 450 500 01234567 iout [a] frequency [khz] vin=7.5v vin=12v vin=18v 0 0.5 1 1.5 2 2.5 050100150 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 0246810121416 iout [a] vout [v] vin=7.5v(-5 vin=21v-5 vin=7.5v(75 vin=21v75 en1 5v/div vo1 2v/div en2 5v/div vo2 2v/div en1 5v/div vo1 2v/div en2 5v/div vo2 2v/div en1 5v/div vo1 2v/div en2 5v/div vo2 2v/div en1 5v/div pgood1 2v/div en2 5v/div pgood2 2v/div www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 11/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV reference data fig.50 ireg1-reg1 fig.51 ireg2-reg2 fig.49 ta-i ocp (vo=3.3v) 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 0246810121416 iout [a] vout [v] vin=7.5v(-5 vin=21v-5 vin=7.5v(75 vin=21v75 www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 12/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV pin descriptions ? vin (30 pin) this is the main power supply pin. the input supply volt age range is 5.5v to 28v. the duty cycle of BD9528AMUV is determined by input voltage and control output voltage. therefore, when vin voltage fluctuated, the output voltage also becomes unstable. since vin line is also the input voltage of switching regulato r, stability depends on the impedance of the voltage supply. it is recommended to establish bypass capa citor and cr filter suitable fo r the actual application. ? ctl (9 pin) when ctl pin voltage is at least 2.3v, the status of the linear regulator output becomes active (reg1=5v, reg2=3.3v). 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 lo w, if the status of en pin is high. ( ctl pin is connected to vin pin with 1m resistor(pull up) intermall ic) ? en1, 2 (21 pin, 4 pin) when en pin voltage is at least 2.3v, the status of the switching regulator becomes active. conversely, the status switches off when en pin voltage goes lower than 0.8v. ( en pin is connected to agnd pin with 1m resistor(pull down) intermall ic) ? reg1 (29 pin) this is the output pin for 5v linear regulator and also active in power supply for driver and control circuit of the inside. th e standby function for reg1 is determined by ctl pin. the vo ltage is 5v, with 100ma current ability. it is recommended that a 10 f capacitor (x5r or x7r) be established between reg1 and gnd. ? reg2 (28 pin) this is the output pin for 3.3v linear regulator. the standby function for reg2 is determined by ctl. the voltage is 3.3v, with 100ma current ability. it is recommended that a 10 f capacitor (x5r or x7r) be established between reg2 and gnd. ? ref (12 pin) this is the setting pin for output voltage of switching regulator. this ic controls the voltage in the status of ref P fb. ? fb 1, 2 (14 pin, 11 pin) this is the feedback pin from the output of switching regulator. this ic contro ls the voltage in the status of ref P fb. ? vo1 (27 pin) this is the output discharge pin, and out put voltage feedback pin for frequency setting. when the voltage is beyond 4.4v from the external power supply during operation, it supplies reg1. ? vo2 (7 pin) this is the output discharge pi n, and output voltage feedback pin for frequency setting. ? ss1, 2 (19 pin, 6 pin) this is the setting pin for soft start. the rising time is determined by the capacitor connected between ss and gnd, and the fixed current inside ic after it is t he status of low in standby mode. it contro ls the output voltage till ss voltage catch up the ref pin to become the ss terminal voltage. ? fs1, 2 (15 pin, 10 pin) this is the input pin for setting the frequency. it is ava ilable to set it in frequency range is 150khz to 500khz. ? ilim1, 2 (17 pin, 8 pin) BD9528AMUV detects voltage differential between sw and pgnd, and set ocp. ocp setting current value is determined by the resistance value of ilim pin. fet of various ron is available. ? pgood 1, 2 (20 pin, 5 pin) this is the open drain pin for deciding the output of switching regulator. ? mctl1, 2 (18 pin, 16 pin) this is the switching shift pin for sllm (simple light load mode). mctl pin is at low level when it goes lower than 0.8v, and at high level when it goes higher than 2.3v. ( mctl pin is connected to agnd pin with 500k resistor(pull down) intermall ic) ? agnd (13 pin) this is the ground pin. ? boot1, 2 (22 pin, 3 pin) this is the power supply pin for high side fet driver. the maximum voltage range to gnd pin is to 35v, to sw pin is to 7v. in switching operations, the voltage swings from (vin+reg1) to reg1 by boot pin operation. ? hg1, 2 (23 pin, 2 pin) this is the highside fet gate drive pin. it is operated in switching between boot to sw. in case the output mos is 3ohm /the status of hi, 2ohm/the stat us of low, it is operated hi -side fet gate in high speed. ? sw1, 2 (24 pin, 1 pin) this is the ground pin for high side fet drive. the maximu m voltage range to gnd pin is to 30v. switching operation swings from the status of boot to the status of gnd. ? lg1, 2 (26 pin, 31 pin) this is the lowside fet gate drive pin. it is operated in switching between reg1 to pgnd. in case the output mos is 2ohm /the status of hi, 0.5ohm/the status of low, it is operated low-side fet gate in high speed. ? pgnd1, 2 (25 pin, 32 pin) this is the ground pin for low side fet drive. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 13/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV explanation of operation the BD9528AMUV is a 2ch synchronous buck regulator controller incorporatin g rohm?s proprietary h 3 reg controlla control system. because controlling of output voltage by a comparator, high response is realized with not relying on the switching frequency. and, when vout drops due to a rapid load change, the system quickly restores vout by extending the ton time interval. thus, it serves to improve the regulator?s transient response. activating the light load mode will also exercise simple light load mode (sllm) control when the load is light, to further increase efficiency. h 3 reg tm control (normal operation) (vout drops due to a rapid load change) (when vin drops) if vin voltage drops because of the battery voltage fall, ontime ton and offtime toff is determined by the following formula: ton=vout/vin i/f and toff=(vin-vout)/vin f so that ton lengthen and toff shorten to keep output voltage constant. however, if vin still drops and toff equals to tminoff (tminoff:minimum off time, regu lated inside ic) , because toff cannot shorten any more, as a result out put voltage drops. in h3regtm system, lengthening ton time than regulated ton (lengthen ton time until fb ref) enables to operate stable not to drop the output voltage even if vin turns to be low. with the reason above, it is suitable for 2-cell battery. fb ref hg lg hg output is determined by the formula above. a fter 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 controll a system. ref fb hg io lg t on + when v out drops due to a rapid load change, and the voltage remains below reference voltage after the programmed t on time interval has elapsed (output of a comparator for output voltag e control =h), the system quickly restores v out by extending the t on time, improving the transient response. after vou t restores (fb=ref), hg turns to be off, and it goes back to a normal operation. internal reference voltage ref fb vout/vin circuit transient circuit driver hg sw lg vin vout comparator for output voltage control a b hg lg fb ref vin t on 1 t on 2t on 3t on 4 t off 1t 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 t on= = vout vin 1 f [sec] ???(1) www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 14/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV light load control (sllm) (qllm) mctl1 mctl2 control mode running l l sllm pwm l h qllm pwm h x pwm pwm timing chart ? soft start function in sllm, when the status of lg is off and the coil current is within 0a (it flows to sw from vout.), sllm function is operated to prevent output next hg. the status of hg is on, when fb falls below reference voltage again. in qllm, when the status of lg is off and the coil current is within 0a (it flows to sw from vout.), qllm function is operated to prevent output next hg. then, fb falls below the output programmed voltage within the programmed time (typ=40 s), the status of hg is on. in case fb doesn?t fall in the programmed time, the status of lg is on forcedly and vout falls. as a result, he status of next hg is on. fb ref hg lg 0 a load c out *attention: h 3 reg tm controlla monitors the supplying current from capacitor to load, using the esr of output capacitor, and realize the rapid response. bypass capacitor used at each load (ex. ceramic capacitor) exercises the effect with connecting to each load side. do not put a ceramic capacitor on cout side o f power supply. en ss vout iin ts s soft start time t ss = ref css 2.3 a(typ) [sec] incoming current iin = covout ts s [a] (css: soft start capacitor; co: output capacitor) ???(2) ???(3) fb hg lg 0 a the BD9528AMUV operates in pwm mode until ss pin reaches cramp voltage (2.5v), regardless of the control mode setting, in order to operate stable during the operation. soft start is exercised with the en pin set high. current control takes effect at st artup, enabling a moderate output voltage ?ramping start.? soft start timing and incoming current are calculated with formulas (2) and (3) below. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 15/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV notes when waking up with ctl pin or vin 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 and 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 act ivation standard of scp. inclination of ref is influenced by the external condenser connected to ref. to be accurate,delay occurs after scp activating. but this shows the relationship of each signals briefly. delay scp pwm (switching control signal) 1ms(typ.) scp circuit bg scp_ref scp ctl ref ss reg1 reg2 fb inner reference circuit vin www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 16/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV output discharge it will be available to use if connecting vout pin to dc/dc output. (total about 100 ) . discharge function operates when en=?l? uvlo=on(if input voltage is low) scp latch time tsd=on. the function at output discharge time is shown as left. (1)during en=?h? l? if en pin voltage is below than en threshold voltage, output discharge function is operated, and discharge output capacito r charge. (2) during vin=ctl=h 0v ic is in normal operation until reg1 voltage becomes lower than uvlo voltage. however, because vin voltage also becomes low, output voltage will drop, too. if reg1 voltage reaches the uv lo voltage, output discharge function is operated, and dischar ge output capacitor charge. in addition, if reg1 voltage drops, inner ic logic cannot operate, so that output discharge function does not work, and becomes output hi-z. (in case, fb has resistor against gnd, discharge at the resistor. vin,ctl en vout the efficiency of vin voltage drop output discharge output hi-z vin, ctl reg1 vout uvlo on www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 17/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV ? timer latch type short circuit protection ? over voltage protection ? over current protection circuit short protection kicks in when output falls to or belo w ref x 0.7. when the programmed time period elapses, output is latched off to prevent destruction of the ic. (hg=low, lg=low) output voltage c an be restored either b y reconnecting the en pin or disabling uvlo. fb scp en / uvlo ref 0.7 0.75ms(typ) fb hg lg ref 1.2 switching when output rise to or above ref 1.2 (typ), output over voltage protection is exercised, and low side fe t goes up maximum for reducing output.(lg=high, hg=low).when output falls, output voltage can be restored., and go back to the normal operation. during the normal operation, when fb becomes less than ref, hg becomes high during the time t on, and after hg becomes off, it output lg. however, when inductor current exceeds i limit threshold, next hg pulse doesn ?t pulsate until it is lowe r than i limit level. t on t on hg lg i l t on t on www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 18/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV external component selection 1. inductor (l) selection passing a current larger than the inductor?s rated current will cause magnetic saturation in the inductor and decrease system efficiency. in selecting the inductor, be sure to allo w enough margin to assure that peak current does not exceed the inductor rated current value. to minimize possible inductor damage and maximize efficiency, choose a inductor with a low (dcr, acr) resistance. 2.output capacitor (c o ) selection please give due consideration to the conditions in formula (8) bel ow for output capacity, bear in mind that output rise time must be established within the soft star t time frame. capacitor for bypass capacitor is connected to load side which connect to output in output capacitor capacity (c ext, figure above). please set the soft star t time or over current detecting value, regarding these capacities. note: improper capacitor may cause startup malfunctions. 3. input capacitor (cin) selection a low esr capacitor is recommended to reduce esr loss and maximize efficiency. the inductor value is a major influence on the output ripple current. a s formula (4) below indicates, the gr eater the inductor or the switching frequency, the lower the ripple current. Si l = (v in -v out )v out l v in f [ a ] ??? ( 4 ) the proper output ripple current setting is about 30% of maximum out p ut current. Si l =0.3 i out max. [a] ???(5) l= (v in -v out )v out Si l v in f [ h ] ??? ( 6 ) (Si l : output ripple current; f: switch frequency) input capacitor output ripple current S il vin il l co vout vin l co vout cin when determining the proper output capacitor, be sure to factor in the equivalent series resistance required to smooth out ripple volume and maintain a stable output voltage range. output ripple voltage is determined as in formula (7) below. Svout= Sil esr+esl S il/t on ??? (7) co+c ext Q tss (limit-iout) vout ??? ( 8 ) tss: soft start time limit: over current detection vin l co vout esr output capacitor esl load c ext (S il: output ripple current esr: c o equivalent series resistance esl: c o equivalent series inductance) the input capacitor selected must have low enough esr resistance to fully support large ripple output, in order to prevent extreme over current. the formula for ripple current irms is given in (9) below. irms=iout v in ( v in -v out ) vin [a] ??? ( 9 ) where v in =2 v out ,irms = iout 2 in selecting a capacitor, make sure the capacitor rating allows sufficient margin relative to output voltage. note that a lower esr can minimize output ripple voltage. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 19/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV 4. mosfet selection 5. setting output voltage this ic is operated that output voltage is ref Pfb. and it is operated that output vo ltage is feed back to fb pin. ex. vin=20v,vout=5v,f=300khz,l=2.5uh,esr=20m ,r1=56k ,r2=9.1k S i l =(20v-5v) 5v/(2.5 10 -6 h 20v 300 10 3 hz)=5[a] Sv out =5a 2010 -3 =0.1[v] v out =0.7v (56k +9.1k )/9.1k +1/2 0.1v=5.057[v] vin l co vout synchronous switch main switch v in -v out v in r on i out 2 +ciss f v dd = ??? (11) pmain=p ron +p gate +p tran psyn=p ron +p gate loss on the main mosfet (ron: on-resistance of fet; ciss: fet gate capacitance; f: switching frequency crss: fet inverse transfer function; i drive : gate peak current) loss on the synchronous mosfet ???(10) v out v in r on i out 2 +ciss f v dd + v in 2 crssi out f i drive = mosfet may cause the loss as below, so please select proper fet for each. (Sv out : output ripple voltage) (notice) please set S fb more than 10mv output voltage ref fb h 3 reg controlla s rq sllm driver circuit sllm vin vin r1 r2 (Si l : ripple current of coil) (l: inductance[h] f: switching frequency[hz]) Sv out =Si l esr Si l =( v in - v out ) v out ( l v in f ) v out = ref(0.7v)+ Sv out (r1+r2) r2 1 2 Si l =(20v-5v) =5(a) 5v ( 2.5 10 -6 h 20v 30010 3 hz ) Sv out =5a 2010 -3 =0.1(v) v out =0.7v + 0.1v=5.057(v) 1 2 (51k + 9.1k ) 9.1k www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 20/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV 6. setting over current protection (example) if load current 5a want to be realized with vin=6 19v v out =5v f=400 h z l=2.5uh r on =20m , the formula would be below. when vin=6v, iocp will be minimum(this is because the ripple cu rrent is also minimum) so that if each condition is input, the formula will be the following: r ilim 109.1[k ]. to design the actual board, please consider enough margin for fet on resistor dispersion, coil inductor dispersion, ic over current reference value dispersion, frequency dispersion. 7. relation between output voltage and t on time the BD9528AMUV, both 1ch and 2ch, are high efficiency synchr onous regulator controller with frequency variable. t on time varies with input voltage [vin], output vo ltage [vout], and rfs of fs pin resistance. t on time is calculated wi th the following formula: ton =k from t on time above, frequency on application condition is following: frequency = however, real-life considerations (such as the external mosfet gate capacitor and switching speed) must be factored in as they affect the overall switching rise and fall ti me, so please confirm in reality by the instrument. rfs ? ontime(vout=5v) rfs ? ontime(vout=3.3v) rfs ? ontime(vout=1v) detecting the on resistance (betwe en sw and pgnd voltage) of mosfet a t low side, it set the over current voltage protection. over current reference voltage (i lim_ref ) is determined as in formula(12) below. 10k r ilim[k ] r on[m ] i lim_ref = (r ilim : resistance for setting of over current voltage protection value[k ] ron: low side on resistance value of fet[m ]) [a] ???(12) [nsec] ???(14) vout vin 1 ton [khz] ???(15) 0 0.5 1 1.5 2 2.5 0 20 40 60 80 100 120 rfs[k] ontime[us] vin=7v vin=12v vin=21v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 20 40 60 80 100 120 rfs[k] ontime[us] 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 rfs[k] ontime[us] vin=7v vin=12v vin=21v vout ?rfs vin however, the value, which set the ov er current protection actually, is determined by the formula (13) below. i lim_ref + i ocp = Si l 1 2 i lim_ref + = 1 2 i f vin - vo l vo vin ??? (13) v in l co v out pgnd sw r ilim coil current i ocp i lim_re f (Si l :coil ripple current[a] vin:input voltage[v] vo:output voltage [v] f:switching frequency [h z ] l:coil inductance [h]) 10k r ilim[k ] r on[m ] i ocp =+ 1 2 i f vin - vo l vo vin 5 www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 21/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV 8. relation between output voltage and frequency because the BD9528AMUV is t on time focused regulator controller, if out put current is up, switching loss of coil, mosfet and output capacitor will increase, and frequency will be fast. loss of each coil, mosfet and output capacitor are below. regarding those loss above and frequency formula, it is determined below. however, real-life considerations (such as parasitic resist ance element of layout pattern) must be factored in as they affect the loss, please confirm in reality by the instrument. vout vin coil loss = iout 2 dcr mosfet(high side) loss = iout 2 ronh vin mosfet(low side) loss = iout 2 ron l (1- vout ) vin iout ton vout iout + + + t (=1/freq) = ??? (17) (ronh : on resistance of high side mosfet, ronl : on resistance of low side mosfet, esr : output capacitor equivalent cascade resistance) www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 22/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV i/o equivalent circuit 1, 24pin (sw2, sw1) 2, 23pin (hg2, hg1) 3, 22pin (boot2, boot1) 4, 21pin (en2, en1) 5, 20pin (pgood 2, 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) boot boot sw reg1 hg sw reg1 hg boot reg1 vin www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 23/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV i/o equivalent circuit 7, 27pin (vo2, vo1) 28pin (reg2) 29pin (reg1) 30pin (vin) 8, 17pin (ilim2, ilim1) reg1 vin vin www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 24/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV evaluation board circuit (vo1=5v/8a, f1=300khz vo2=3.3v/8a f2=300khz) designation rating part no. company designation rating part no. company r1 0 - - c4 0.1uf(6.3v) grm21bb10j104kd murata r5 68k mcr03 rohm c5 2200pf grm188b11h102kd murata r6 68k mcr03 rohm c6 2200pf grm188b11h102kd murata r7 75k mcr03 rohm c7 0.47uf grm188b11a474kd murata r8 75k mcr03 rohm c8 0.47uf grm188b11a474kd murata r9 0 - - c9 10uf(25v) grm31cb31e106ka75 murata r10 0 - - c12 10uf(25v) grm31cb31e106ka75 murata r11 0 - - c14 330uf 6tpe330mi sanyo r12 0 - - c18 330uf 6tpe330mi sanyo r13 0 - - c30 1000pf grm 1882c1h102ja01 murata r14 0 - - c31 1000pf grm 1882c1h102ja01 murata r15 100k mcr03 rohm (d1) (di ode) (rsx501l-20) (rohm) r16 100k mcr03 rohm (d2) (di ode) (rsx501l-20) (rohm) r17 56k mcr03 rohm l1 2.2uh fdve1040-2r2m toko r18 9.1k mcr03 rohm l2 2.2uh fdve1040-2r2m toko r19 30k mcr03 rohm q1 fet rmw130n03 rohm r20 8.2k mcr03 rohm q2 fet rmw130n03 rohm c1 10uf(25v) grm31cb31e106ka75 murata q3 fet rmw130n03 rohm c2 10uf(10v) grm21bb10j106kd murata q4 fet rmw130n03 rohm c3 10uf(6.3v) grm21bb10j106kd murata u1 - BD9528AMUV rohm note) without any value of ripple(about 10mv), there is a possibility of fb sig nal not acting stable switching due to the adoption of comparator control method. please use in condition with enough ripple voltage either by reducing the l-value of coil, or using big output capacitor of esr. ripple voltage can be generated in fb terminal by adding capacitor in parallel to resistor (r17, r19) of fb termi nal, but because it becomes delicate to noise from output (vo1/vo2) line it is not recommended. also condition of stable action gets effected by layout of board, etc., so please give full attention. vin ctl en1 en2 reg1 reg2 ref ss1 fs1 boot1 hg1 sw1 lg1 pgnd1 fb1 boot2 hg2 sw2 lg2 pgnd2 vin 12v c1 ctl en1 en2 ctl en1 en2 vin reg1 reg1 reg1 5v reg2 3.3 v c2 c3 c4 c5 c6 q3 q4 vin vin c12 sw2 d2 q1 q2 c7 vin vin c9 sw1 d1 30 9 21 4 29 28 12 19 6 15 22 23 24 26 25 14 3 2 1 31 32 BD9528AMUV r1 r12 r13 r14 r10 r9 r11 l2 r19 vo2 c18 l1 r17 vo1 c14 fs2 10 mctl1 a gnd fb2 pgood1 pgood2 c8 reg1 reg1 pgood2 pgood1 18 13 mctl1 11 20 5 r15 r16 ss2 vo1 vo2 ilim2 8 ilim1 17 27 7 r5 r6 r7 r8 r20 r18 mctl2 mctl2 16 power ground a nalog ground c30 c31 www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 25/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV handling method of unused pin during using only dc/dc 1ch if using only 1ch dc/dc and 2ch pin is set to be off at all times, please manage the unused pin as diagram below. pin no, pin name management 1 sw2 gnd 2 hg2 open 3 boot2 open 4 en2 gnd 5 pgood2 gnd 6 ss2 gnd 7 vo2 gnd 8 ilim2 gnd 10 fs2 gnd 11 fb2 gnd 31 lg2 open vin ctl en1 en2 reg1 reg2 ref ss1 fs1 boot1 hg1 sw1 lg1 pgnd1 fb1 boot2 hg2 sw2 lg2 pgnd2 vin 12v c1 ctl en1 ctl en1 vin reg1 reg1 5v reg2 3.3 v c2 c3 c4 c5 q1 q2 c7 vin vin c9 c10 sw1 d1 30 9 21 4 29 28 12 19 6 15 22 23 24 26 25 14 3 2 1 32 BD9528AMUV r1 r10 r9 r11 l1 r17 vo1 c14 fs2 10 mctl1 a gnd fb2 pgood1 pgood2 reg1 pgood1 18 13 mctl1 11 20 5 r15 ss2 vo1 vo2 ilim2 8 ilim1 17 27 7 r5 r7 r18 mctl2 mctl2 16 www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 26/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV example of pcb layout sw2 hg2 boot2 en2 pgood2 ss2 vo2 ilim2 ctl fs2 fb2 ref agnd fb1 fs1 mctl2 ilmi1 mctl1 ss1 pgood1 en1 boot1 sw1 pgnd1 lg1 vo1 reg2 reg1 vin lg2 pgnd2 hg1 l-fet (ch2) vo2 vo1 l-fet (ch1) l l co co cin cin r c c r r r r r r c c c high current gnd high current gnd silentgnd silentgnd h-fet (ch2) vin h-fet (ch1) because high pulse current rush into power loop, consist ed of input capacitor cin, ou tput inductor l and output capacitor co, this part layout should be built at parts side (upper side) including gnd pattern. also, drawing via formation in power loop line should be avoided. (the reason is that it will be a factor of noise because via oneself holds some nh parasitic inductance) fb pin has comparatively high impedance, so fl oating capacity should be minimum as possible. and feedback wiring from output shoul d be taken properly, and shielding, not going through around l (because of magnetic). please be careful in drawing. trace from sw node pin to inductor should be cut short. and both inductor element pattern should be kept away. (closer wiring has sw node noise influence vo by parasitic capacity between wiring). this layout example shows that sw node is outside, but if the app lication board will be like that, sw node should be shielded. please consider the influence to other circuit. input capacitor cin should be placed close to ic with low inductance. if that is difficult, please place a capacitor for high frequ ency removal with pkg size small like 0.1uf (esl small). 2 nd layer and 3 rd layer are plain gnd, so connect from parts side gnd to plain gnd by low impedance with many via as possible. inner gnd is only for shielding, so that no to form loop for high current. please take gnd pattern space widely, and design layout to be able to increase radiation efficiency. fs pin and ilim pin has high impedance. external re sistor should be connected to ?silent gnd?. www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 27/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV operation notes and precautions 1. this integrated circuit is a monolithic ic, which (as shown in the figure below), has p + isolation in the p substrate and between the various pins. a p-n junction is formed from this p layer and n layer of each pin, with the type of junction depending on the relation between each potential, as follows: ? when gnd element a element b, the p-n junction is a diode. ? when element b gnd element a, the p-n junction oper ates as a parasitic transistor. parasitic diodes inevitably occur in the structure of the ic . the operation of parasitic diodes can result in mutual interference among circuits, as well as operating malfuncti ons and physical damage. ther efore, be careful to avoid methods by which parasitic diodes operate, such as applying a voltage lower than the gnd (p substrate) voltage to an input pin. 2. in some modes of operation, power supply voltage and pin voltage are reversed, giving rise to possible internal circuit damage. for example, when the external capacitor is charged, the electric charge can cause a vcc short circuit to the gnd. in order to avoid these problems, inserting a vc c series countercurrent prevention diode or bypass diode between the various pins and the vcc is recommended. 3. absolute maximum rating although the quality of this ic is ri gorously controlled, the ic may be destr oyed when applied voltage or operating temperature exceeds its absolute maximum rating. because short mode or open mode cannot be specified when the ic is destroyed, it is important to take physical safety measures such as fusing if a special mode in excess of absolute rating limits is to be implemented. 4. gnd potential make sure the potential for the gnd pin is always kept lowe r than the potentials of all other pins, regardless of the operating mode. 5. thermal design in order to build sufficient margin into the thermal desi gn, give proper consideration to the allowable loss (power dissipation) in actual operation. 6. short-circuits between pins and incorrect mounting position when mounting the ic onto the circuit boar d, be extremely careful about the ori entation and position of the ic. the ic may be destroyed if it is incorrectly positioned for mountin g. do not short-circuit between any output pin and supply pin or ground, or between the out put pins themselves. accidental attachment of small objects on these pins will cause shorts and may damage the ic. 7. operation in strong electromagnetic fields use in strong electromagnetic fields may cause malfuncti ons. use extreme caution wi th electromagnetic fields. 8. thermal shutdown circuit this ic is provided with a built-in thermal shutdown (t sd) circuit, which is activated when the operating temperature reaches 175 (standard value), and has a hysteresis range of -15 (standard value). when the ic chip temperature rises to the thresho ld, all the inputs automatically turn off. note that the tsd circuit is provided for the exclusive purpose shutting down the ic in the presence of extreme hea t, and is not designed to protect the ic per se or guarantee performance when or after extreme heat c onditions occur. therefore, do not operate the ic with the expectation of continued use or subsequent operati on once the tsd is activated. resistor transistor (npn) n n n p + p + p p substrate gnd parasitic element pin a n n p + p + p p substrate gnd parasitic element pin b c b e n gnd pin a p aras iti c element pin b other adjacent elements e b c gnd p aras iti c element vcc pin counter current prevention diode bypass diode www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 28/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV 9. capacitor between output and gnd when a larger capacitor is connected between the output and g nd, vcc or vin shorted with the gnd or 0v line ? for any reason ? may cause the charged capacitor current to flow to the output, possibly destroying the ic. do not connect a capacitor larger than 1000uf between the output and gnd. 10. precautions for board inspection connecting low-impedance capacitors to run inspections with the board may produce st ress on the ic. therefore, be certain to use proper discharge procedure before each proce ss of the operation. to prevent electrostatic accumulation and discharge in the assembly process, thoroughly ground yourself and any equipm ent that could sustain esd damage, and continue observing esd-prevention procedures in all han dling, transfer and storage operations. before attempting to connect components to the test setup, make certain that the power supply is off. likewise, be sure the power supply is off before removing any component connected to the test setup. 11. gnd wiring pattern when both a small-signal gnd and high curr ent gnd are present, single-point groundi ng (at the set standard point) is recommended, in order to separate the small-signal and high current patterns, and to be sure the voltage change stemming from the wiring resistance and high current does not cause any voltage change in the small-signal gnd. in the same way, care must be taken to avoid wiring pattern fluctuations in any connected external component gnd. heat dissipation characteristics ambient temperature [ta] power dissipation [pd] 150 125 100 75 50 25 0 200 400 600 800 1000 [ ] [mw] 880mw 380mw 74.2mm 74.2mm 1.6mm glass-epoxy pcb j-a=142.0 /w ic only j-a=328.9 /w www.datasheet.co.kr datasheet pdf - http://www..net/
technical note 29/29 www.rohm.com 2011.11 - rev. a ? 2011 rohm co., ltd. all rights reserved. BD9528AMUV ordering part number b d 9 5 2 8 a mu v -e 2 package muv : vqfn032v5050 packaging and forming specification e2: embossed tape and reel (unit : mm) vqfn032v5050 0.08 s s 1.0max (0.22) 0.02 +0.03 - 0.02 24 8 1 9 32 16 25 17 0.5 0.75 0.4 0.1 3.4 0.1 3.4 0.1 0.25 +0.05 - 0.04 c0.2 5.0 0.1 5.0 0.1 1pin mark ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin www.datasheet.co.kr datasheet pdf - http://www..net/
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. www.datasheet.co.kr datasheet pdf - http://www..net/

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