View BD9102FVM_4722059.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 / 27 02.mar.2012 rev.001 www.rohm.com tsz02201 - 0j3j0aj00080 - 1 - 2 ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 14 ? 001 4.0v(or 4.5v) to 5.5v, 0.8a 1ch s ynchronous buck converter integrated fet BD9102FVM bd9104fvm bd9106fvm general description rohms high efficiency step - down switching regulator ( BD9102FVM, bd9104fvm, bd9106fvm ) is a power supply designed to produce a l ow voltage including 1.24 volts from 5 volts power supply line. offers high efficiency with our original pulse skip control technology and synchronous rectifier. employs a current mode control system to provide faster transient response to sudden change in load. features ? offers fast transient response with current mode pwm control system. ? offers highly efficiency for all load range with synchronous rectifier (nch/pch fet) and sllm tm (simple light load mode) ? incorporates soft - start function. ? incorporates th ermal protection and ulvo functions. ? incorporates short - current protection circuit with time delay function. ? incorporates shutdown function typical application circuit key specifications ? i nput voltage range BD9102FVM , bd9106fvm: 4.0v to 5.5 v bd9104fvm 4.5v to 5.5v ? output voltage range BD9102FVM: 1.24v 2% bd9104fvm: 3.30v 2% bd9106fvm: 1.20v to 2.50v ? output current : 0.8a(max.) ? switching frequency : 1.0mhz(typ.) ? pch fet on resistance : 350m (typ.) ? nch fet on resistance : 250m (typ.) ? standb y current : 0 a(max.) ? operating temperature range : - 25 to +85 package msop8 : 2.9 0 mm x 4.0 0 mm x 0.83 mm applications power supply for hdd, power supply for portable electronic devices like pda, and power supply for lsi including cpu and a sic gnd,pgnd sw v cc ,pv cc en v out ith v cc v out cin r ith c ith l esr c o r o v out fig. 1 typical a pplication circuit product structure silicon monolithic integrated circuit this product is not designed protection against radioactive rays.
2 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 pin configuration pin description pin no. pin name pin function 1 v out /adj output voltage detect pin/ adj for bd9106fvm 2 ith gmamp output pin/connected phase com pensation capacitor 3 en enable pin(active high) 4 gnd ground 5 pgnd nch fet source pin 6 sw pch/nch fet drain output pin 7 pv cc pch fet source pin 8 v cc vcc power supply input pin ordering information line up i nput voltage range out put voltage range uvlo threshold voltage typ package orderable part number 4.0 v to 5.5v 1.24v2% 2.7v ms op8 reel of 30 00 bd9 102 f vm - tr 4.0 v to 5.5v adjustable(1.0 to 2.5v) 3.4v msop8 reel of 30 00 bd9 106 f vm - tr 4.5 v to 5.5v 3.30v2% 4.1v ms op8 reel of 30 00 bd9 104fvm - tr b d 9 1 0 x f v m - t r part number package fvm : msop8 packaging and forming specification tr: embossed tape and reel 8 7 6 5 v cc pv cc sw pgnd 1 2 3 4 v out ith en gnd fig. 2 BD9102FVM bd9104fvm 8 7 6 5 v cc pv cc sw pgnd 1 2 3 4 adj ith en gnd fig. 3 bd9106fvm (top view) (top view)
3 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 block diagrams fig. 4 BD9102FVM bd9104fvm block diagram fig.5 bd9106fvm block diagram
4 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 absolute maximum ratings (ta=25 ) parameter symbol limits unit vcc voltage v cc - 0.3 to +7 *1 v pvcc voltage pv cc - 0.3 to +7 *1 v en voltage en - 0.3 to +7 v sw,ith voltage sw,ith - 0.3 to +7 v power dissipation 1 pd1 387.5 *2 mw power dissipation 2 pd2 587.4 *3 mw operating temperature range topr - 25 to +85 storage temperature range tstg - 55 to +150 maximum junction temperature tjmax +150 *1 pd should not be exceeded. *2 derating in done 3.1mw/ for temperatures above ta=25 . *3 derating in done 4.7mw/ for temperatures above ta=25 ,mounted on 70mm7 0mm1.6mm glass epoxy pcb operating ratings (ta=25 ) parameter symbol BD9102FVM bd9104fvm bd9106fvm unit min. max. min. max. min. max. v cc voltage v cc 4.0 5.5 4.5 5.5 4.0 5.5 v pv cc voltage pv cc *4 4.0 5.5 4.5 5.5 4.0 5.5 v en voltage en 0 v cc 0 v cc 0 v cc v sw average output current isw *4 - 0.8 - 0.8 - 0.8 a *4 pd should not be exceeded. electrical characteristics BD9102FVM(ta=25 ,v cc =5v,en=v cc unless otherwise specified. ) parameter symbol min. typ. max. unit conditions standby current i stb - 0 10 a cc - 250 400 a enl - gnd 0.8 v standby mode en high voltage v enh 2.0 v cc - v active mode en input current i en - 1 10 a osc 0.8 1 1.2 mhz pch fet on resistance *5 r onp - 0.3 5 0.60 cc =5v nch fet on resistance *5 r onn - 0.25 0.50 cc =5v output voltage v out 1.215 1.24 1.265 v ith si nk current i thsi 10 20 - a out =h ith s ource c urrent i thso 10 20 - a out =l uvlo threshold voltage v uvloth 2.6 2.7 2.8 v v cc =hl uvlohys 50 100 200 mv soft start time t ss 0.5 1 2 ms timer latch time t latch 0.5 1 2 ms *5 design guarantee outgoing inspection is not done on all products
5 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 bd9104fvm(ta=25 ,v cc =5v,en=v cc unless otherwise specified. ) parameter symbol min. typ. max. unit conditions standby current i stb - 0 10 a cc - 250 400 a enl - gnd 0.8 v standby mode en high voltage v enh 2.0 v cc - v active mode en input current i en - 1 10 a en =5v oscillation fre quency f osc 0.8 1 1.2 mhz pch fet on resistance *5 r onp - 0.35 0.60 cc =5v nch fet on resistance *5 r onn - 0.25 0.50 cc =5v output voltage v out 3.234 3.300 3.366 v ith si nk current i thsi 10 20 - a out =h ith s ource c urrent i thso 10 20 - a o ut =l uvlo threshold voltage v uvloth 3.9 4.1 4.3 v v cc =hl uvlohys 50 100 200 mv soft start time t ss 0.5 1 2 ms timer latch time t latch 0.5 1 2 ms *5 design guarantee outgoing inspection is not done on all products bd910 6fvm(ta=25 ,v cc =5v,en=v cc ,r 1 =20k,r 2 =10k unless otherwise specified. ) parameter symbol min. typ. max. unit conditions standby current i stb - 0 10 a cc - 250 400 a enl - gnd 0.8 v standby mode en high voltage v enh 2.0 v cc - v active mode en input current i en - 1 10 a en =5v oscillation frequency f osc 0.8 1 1.2 mhz pch fet on resistance *5 r onp - 0.35 0.60 cc =5v nch fet on resistance *5 r onn - 0.25 0.50 cc =5v adj reference voltage v adj 0.780 0.800 0.8 20 v output voltage v out - 1.200 - v ith si nk current i thsi 10 20 - a s ource c urrent i thso 10 20 - a uvloth 3.2 3.4 3.6 v v cc =h uvlohys 50 100 200 mv soft start time t ss 1.5 3 6 ms timer latch time t latch 0.5 1 2 ms * 5 design guarantee outgoing inspection is not done on all products
6 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 typical performance curves v cc - v out fig . 7 vcc - vout fig.8 vcc - vout fig.6 vcc - vout
7 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 v en - v out fig.9 ven - vout fig.10 ven - vout fig. 1 1 ven - vout
8 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 i out - v out fig. 1 2 iout - vout fig. 1 4 io ut - vout fig. 1 3 iout - vout
9 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 soft start fig.15 soft start waveform fig.16 soft start waveform fig.17 soft start waveform
10 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 sw waveform i o =10ma fig.1 8 sw waveform io=10ma(sllm tm control) fig.1 9 sw waveform io=10ma(sllm tm control) fig. 20 sw waveform io=10ma(sllm tm control v out =1.8v)
11 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 sw waveform i o =200ma fig.2 1 sw waveform io=200ma(pwm control) fig.2 2 sw waveform io=200ma(pwm control) fig.2 3 sw waveform io=200ma(pwm control v out =1.8v)
12 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 transient response i o =100ma fig.2 4 transient response io=100 600ma(10s) 600ma(10s) 600ma(10s out =1.8v)
13 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 transient response i o =600ma fig.2 7 transient response io=600 100ma(10s) 100ma(10s) 100ma(10s) out =1.8v)
14 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 ta - v out fig. 30 ta - v out fig.3 1 taa - v out fig.3 2 ta - v out
15 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 efficiency fig.3 3 efficiency (vcc=en=5v,vout=1.24v) fig.3 4 efficiency (vcc=en=5v,vout=3.3v) fig.3 5 efficiency (vcc=en=5v,vout=1.8v)
16 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 reference characteristics fig.3 7 ta - r onn fig.3 8 ta - r onp fig.3 6 ta - f osc fig.3 9 ta - v en
17 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 fig. 40 ta - i cc fig.4 1 vcc - fosc
18 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 application information operation BD9102FVM, bd9104fvm, bd9106fvm are the synchronous rectifying step - down switching regulator that ac hieves faster transient response by employing current mode pwm control system. it utilizes switching operation in pwm (pulse width modulation) mode for heavier load, while it utilizes sllm tm (simple light load mode) operation for lighter load to improve e fficiency. synchronous rectifier it does not require the power to be dissipated by a rectifier externally connected to a conventional dc/dc converter ic, and its p.n junction shoot - through protection circuit limits the shoot - through current during operation, by whic h the power dissipation of the set is reduced. current mode pwm control synthesizes a pwm control signal with a inductor current feedback loop added to the voltage feedback. ? pwm (pulse width modulation) control the oscillation frequency for pwm is 1 mhz . set signal form osc turns on a p - channel mos fet (while a n - channel mos fet is turned off), and an inductor current i l increases. the current comparator (current comp) receives two signals, a current feedback control signal (sense: voltage converted fr om i l ) and a voltage feedback control signal (fb), and issues a reset signal if both input signals are identical to each other, and turns off the p - channel mos fet (while a n - channel mos fet is turned on) for the rest of the fixed period. the pwm control repeat this operation. ? sllm tm (simple light load mode) control when the control mode is shifted from pwm for heavier load to the one for lighter load or vise versa, the switching pulse is designed to turn off with the device held operated in normal pwm control loop, which allows linear operation without voltage drop or deterioration in transient response during the mode switching from light load to heavy load or vise versa. although the pwm control loop continues to operate with a set signal from osc an d a reset signal from current comp, it is so designed that the reset signal is held issued if shifted to the light load mode, with which the switching is tuned off and the switching pulses are thinned out under control. activating the switching intermitte ntly reduces the switching dissipation and improves the efficiency. fig.4 2 diagram of current mode pwm control osc level shift driver logic r q s i l sw ith current comp gm amp. se t reset fb load sense v out v out fig.43 pwm switching timing chart fig.44 sllm tm switchin g timing chart current comp set reset sw v out pvcc gnd gnd gnd i l (ave) v out (ave) sense fb current comp set reset sw v out pvcc gnd gnd gnd 0a v out (ave) sense fb i l not switching i l
19 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 description of operations ? soft - start function en terminal shifted to high activates a soft - starter to gradually establish the output voltage with the current limited during startup, by which it is possible to prevent an overshoot of output voltage and an inrush current. ? shutdo wn function with en terminal shifted to low, the device turns to standby mode, and all the function blocks including reference voltage circuit, internal oscillator and drivers are turned to off. circuit current during standby is 0 f (typ.). ? uvlo func tion detects whether the input voltage sufficient to secure the output voltage of this ic is supplied. and the hysteresis width of 100 mv (typ.) is provided to prevent output chattering. ? BD9102FVM bd9104fvm t ss =1msec(typ.) ? bd9106fvm t ss =3msec(typ.) fig.4 5 soft start, shutdown, uvlo timing chart ? short - current protection circuit with time delay function turns off the output to protect the ic from breakdown when the incorporated current limiter is activated continuously for a t least 1 ms. the output thus held tuned off may be recovered by restarting en or by re - unlocking uvlo. fig.4 6 short - current protection circuit with time delay timing chart hysteresis 100mv tss tss tss soft start standby mode operating mode standby mode operating mode standby mode operating mode standby mode uvlo en uvlo uvlo v cc en v out 1msec output off l atch en v out limit i l standby mode operating mode standby mode operating mode en timer latch en
20 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 information on advantages advantage 1 offers fast transient response with current mode control system. voltage drop due to sudden change in load was reduced by 50%. fig.47 comparison of transient response advantage 2 offers high efficiency for all load range. ? for ligh ter load: utilizes the current mode control mode called sllm for lighter load, which reduces various dissipation such as switching dissipation (p sw ), gate charge/discharge dissipation, esr dissipation of output capacitor (p esr ) and on - resistance dissipatio n (p ron ) that may otherwise cause degradation in efficiency for lighter load. achieves efficiency improvement for lighter load. ? for heavier load: utilizes the synchronous rectifying mode and the low on - resistance mos fets incorporated as power transistor. on resistance of p - channel mos fet: 0.35 ? (typ.) on resistance of n - channel mos fet: 0.25 ? (typ.) achieves efficiency improvement for heavier load. offers high efficiency for all load range with the improvements mentioned above. advantage 3 ? supplied in smaller package like mosp8 due to small - sized power mos fet incorporated. ? allows reduction in size of application pr oducts reduces a mounting area required. fig.49 example application ? output capacitor co required for current mode control: 10 f ceramic capacitor ? required for the operating frequency of 1 mhz: 4.7 h dc/dc convertor controller r ith l co v out c ith v cc cin 10mm 15mm r ith c ith c in c o l v out i out 228mv v out i out 110mv conventional product (vout of which is 3.3 volts ) bd9104fvm ( load response i o =100ma 0.001 0.01 0. 1 1 0 50 100 pwm sllm tm inprovement by sllm system improvement by synchronous rectifier efficiency [%] output current io[a] fig.4 8 efficiency
21 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 switching regulator efficiency efficiency ? may be expressed by the equation shown below: efficiency may be improved by reducing the switching regulator power dissipa tion factors p d as follows: dissipation factors: 1) on resistance dissipation of inductor and fet pd(i 2 r) 2) gate charge/discharge dissipation pd(gate) 3) switching dissipation pd(sw) 4) esr dissipation of capacitor pd(esr) 5) operating current dissipati on of ic pd(ic) 1)pd(i 2 r)=i out 2 (r coil r on ) (r coil [] dc resistance of inductor, r on [] on resistance of fet i out [a] output current.) 2)pd(gate)=cgsfv (cgs[f] gate capacitance of fet,f[h] switching frequency,v[v] gate driving voltage of fet) 4)p d(esr)=i rms 2 esr (i rms [a] ripple current of capacitor,esr[] equivalent series resistance.) 5)pd(ic)=vini cc (i cc [a] circuit current.) consideration on permissible dissipation and heat generation as this ic functions with high efficiency without signifi cant heat generation in most applications, no special consideration is needed on permissible dissipation or heat generation. in case of extreme conditions, however, including lower input voltage, higher output voltage, heavier load, and/or higher temperat ure, the permissible dissipation and/or heat generation must be carefully considered. for dissipation, only conduction losses due to dc resistance of inductor and on resistance of fet are considered. because the conduction losses are considered to play t he leading role among other dissipation mentioned above including gate charge/discharge dissipation and switching dissipation. p=i out 2 (r coil +r on ) r on =dr onp +(1 - d)r onn d on duty (=v out /v cc ) r coil dc resistance of coil r onp on resistance of p - channel mos fet r onn on resistance of n - channel mos fet i out output current if v cc =5v, v out =3.3v, r coil =0.15, r onp =0.35, r onn =0.25 i out =0.8a, for example, d=v out /v cc =3.3/5=0.66 r on =0.660.35+(1 - 0.66)0.25 =0.231+0.085 =0.316[] p=0.8 2 (0.15+0.316) P 298[mv] as r onp is greater than r onn in this ic, the dissipation increases as the on duty becomes greater. with the consideration on the dissipation as above, thermal design must be carried out with sufficient margin allowed. = out i out viniin 100[%]= p out pin 100[%]= p out p out +p d 2 c rss i ou t f i drive 3)pd(sw)= (c rss [f] drive [a] ambient temperature:ta [ ] fig.50 thermal derating curves 0 200 400 600 800 1000 387.5mw 587.4mw using an ic alone j - a=322.6 /w mounted on glass epoxy pcb j - a=212.8 /w power dissipation:pd [mw] 0 25 50 75 100 125 150 85
22 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 sel ection of components externally connected 1. selection of inductor (l) * current exceeding the current rating of the inductor results in magnetic saturation of the inductor, which decreases efficien cy. the inductor must be selected allowing sufficient margin with which the peak current may not exceed its current rating. if v cc =5v, v out =3.3v, f=1mhz, i l =0.30.8a=0.24a, for example, *select the inductor of low resistance component (such as dcr and acr) to minimize dissipation in the inductor for better eff iciency. 2. selection of output capacitor (c o ) as the output rise time must be designed to fall within the soft - start time, the capacitance of output capacitor should be determined with consideration on the requirements of equation (5): in case of bd9104fvm, for instance, and if v out =3.3v, i out =0.8a, and t s s =1ms, inappropriate capacitance may cause problem in startup. a 10 f to 100 f ceramic capacitor is recommended. 3. selection of input capacitor (cin) a low esr 10f/10v ceramic capacitor is recommended to reduce esr dissipa tion of input capacitor for better efficiency. the inductance significantly depends on output ripple current. as seen in the equation (1), the ripple current decreases as the inductor and/or switching frequency increases. i l = (v cc - v out )v out l cc ??? appropriate ripple current at output should be 30% more or less of the maximum output current. i l =0.3i out max. [a] ??? cc - v out )v out i l v cc f [h] ??? l : output ripple current, and f: switching frequency ) output capacitor should be selected with the consideration on the stability region and the equ ivalent series resistance required to smooth ripple voltage. output ripple voltage is determined by the equation (4) v out =i l esr [v] ??? (i l : output ripple current, esr: equivalent series resistance of output capacitor) *rating of the capacitor sh ould be determined allowing sufficient margin against output voltage. less esr allows reduction in output ripple voltage. input capacitor to select must be a low esr capacitor of the capacitance sufficient to cope with high ripple current to prevent high transient voltage. the ripple current i rms is given by the equation (6): i rms =i out v cc (v cc - v out ) v cc [a] ??? rms = i out 2 fig.5 2 output capacitor (5 - 3.3)3.3 0.24 =4.675 4.7[h] rms(max.) if v cc =5v, v out =3.3v, and i outmax.= 0.8a, i rms =0.8 5(5 - 3.3) 5 =0.46[a rms ] Q ss (i limit - i out ) v out ??? limit : over current detection level, 2a(typ) fig.53 input capacitor i l fig.5 1 output ripple current i l v cc il l co vout v cc l co v out esr co Q P 364 [f] v cc l co v out cin
23 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 4. determination of r ith , c ith that works as a phase compensator as the current mode control is designed to limit a inductor current, a pole (phase lag) appears in the low frequency area due to a cr filter co nsisting of a output capacitor and a load resistance, while a zero (phase lead) appears in the high frequency area due to the output capacitor and its esr. so, the phases are easily compensated by adding a zero to the power amplifier output with c and r a s described below to cancel a pole at the power amplifier. stable feedback loop may be achieved by canceling the pole fp (min.) produced by the ou tput capacitor and the load resistance with cr zero correction by the error amplifier. 5. determination of output voltage (for bd9106fvm only) the output voltage v out is determined by the equation (7): v out =(r2/r1+1)v adj ??? (7) v adj : voltage at adj terminal (0.8v typ.) with r1 and r2 adjusted, the output voltage may be determined as required.(adjustable output voltage range 1.0v to 2.5v) use 1 k? to 100 k? resistor for r1. if a resistor of the resistance higher than10 0 k? is used, check the assembled set carefully for ripple voltage etc. fig.57 determination of output voltage gain [db] phase [deg] fig.54 open loop gain characteristics a 0 0 - 90 a 0 0 - 90 fz(amp.) fig.55 error amp phase compensation characteristics fp= 2r o c o 1 fz (esr) = 2e sr c o 1 pole at power amplifier when the output current decreases, the load resistance ro increases and the pole fr equency lowers. fp (min.) = 2r omax. c o 1 [hz]with lighter load (max.) = 2r omin. c o 1 [hz]with heavier load (amp.) = 2r ith. c ith 1 gnd,pgnd sw v cc ,pv cc en v out ith v cc v out cin r ith c ith l esr c o r o v out fig.56 typical application fz (amp.) = fp (min.) 2r ith c ith 1 = 2r omax. c o 1 sw 6 1 adj 4.7h 10f r2 r1 output fp(min.) fp(max.) fz(esr) i out min. i out max. gain [db] phase [deg]
24 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 BD9102FVM, bd9104fvm, bd9106fvm cautions on pc board layout fig.58 layout diagram for the sections drawn with heavy line, use thick conductor pattern as short as possible. lay out the input ceramic capacitor c in closer to the pins pv cc and pgnd, and the output capacitor co closer to the pin pgnd. lay out c ith and r ith between the pins ith and gnd as neat as possible with leas t necessary wiring. table1.recommended parts list of application [BD9102FVM] symbol part value manufacturer series l inductor 4.7h in ceramic capacitor 10f o ceramic capacitor 10f ith ceramic capacitor 330pf murata grm18series r ith resistor 30k 4.7h in ceramic capacitor 10f o ceramic capacitor 10f ith ceramic capacitor 330pf murata grm18series r ith resistor 51k 4.7h in ceramic capacitor 10f o ceramic capacitor 10f ith ceramic capacitor 750pf murata grm18series t able4.bd9106fvm r ith recommended value vout[v] r ith 1.0 18k 22k 2k 27k 36k out /adj ith en gnd v cc pv cc sw pgnd c o gnd v out v cc l ith c ith c in *bd9106fvm: as the resistance recommended for rith depends on the output voltage, check the output voltage for determination of resistance.
25 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 i/o equivalence circuit fig.59 i/o equivalence circuit v cc v out 10k 1pin(v out ) v cc adj 10k bd9106fvm 1pin(adj) v cc ith 2pin(ith) v cc v cc en 10k 3pin(en) 2.8m 2.2k pv cc sw 6pin(sw) pv cc pv cc
26 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 operational notes 1. absolute maximum ratings while utmost care is taken to quality control of this product, any application that may exceed some of the absolute maximum ratings including the voltage applied and the operating temperature range may result in breakage. if broken, short - mode or open - mode may not be identified. so if it is expected to encounter with special mode that may exceed the absolute maximum ratings, it is requested to take necessary safety measures physically including insertion of fuses. 2. electrical potential at gnd gnd must be designed to have the lowest electrical potential in any operating conditio ns. 3. short - circuiting between terminals, and mismounting when mounting to pc board, care must be taken to avoid mistake in its orientation and alignment. failure to do so may result in ic breakdown. short - circuiting due to foreign matters entered betw een output terminals, or between output and power supply or gnd may also cause breakdown. 4.operation in strong electromagnetic field be noted that using the ic in the strong electromagnetic radiation can cause operation failures. 5. thermal shutdown pro tection circuit thermal shutdown protection circuit is the circuit designed to isolate the ic from thermal runaway, and not intended to protect and guarantee the ic. so, the ic the thermal shutdown protection circuit of which is once activated should not be used thereafter for any operation originally intended. 6. inspection with the ic set to a pc board if a capacitor must be connected to the pin of lower impedance during inspection with the ic set to a pc board, the capacitor must be discharged after ea ch process to avoid stress to the ic. for electrostatic protection, provide proper grounding to assembling processes with special care taken in handling and storage. when connecting to jigs in the inspection process, be sure to turn off the power supply before it is connected and removed. 7. input to ic terminals this is a monolithic ic with p + isolation between p - substrate and each element as illustrated below. this p - layer and the n - layer of each element form a p - n junction, and various parasitic elem ent are formed. if a resistor is joined to a transistor terminal as shown in fig 60 : p - n junction works as a parasitic diode if the following relationship is satisfied; gnd>terminal a (at resistor side), or gnd>terminal b (at transistor side); and if gn d>terminal b (at npn transistor side), a parasitic npn transistor is activated by n - layer of other element adjacent to the above - mentioned parasitic diode. the structure of the ic inevitably forms parasitic elements, the activation of which may cause inte rference among circuits, and/or malfunctions contributing to breakdown. it is therefore requested to take care not to use the device in such manner that the voltage lower than gnd (at p - substrate) may be applied to the input terminal, which may result in activation of parasitic elements. fig. 60 simplified structure of monorisic ic 8. ground wiring pattern if small - signal gnd and large - current gnd are provided, it will be recommended to separate the large - current gnd pattern from the small - sig nal gnd pattern and establish a single ground at the reference point of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of th e small - signal gnd. pay attention not t o cause fluctuations in the gnd wiring pattern of external parts as well. status of this document the japanese version of this document is formal specification. a customer may use this translation version only for a reference to help reading the formal version. if there are any differences in translation version of this document formal version takes priority.
27 / 27 BD9102FVM bd9104fvm bd9106fvm data s heet 02.mar.2012 rev.001 www.rohm.com ? 2011 rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 tsz02201 - 0j3j0aj00080 - 1 - 2 physical dimension tape and reel information marking diagram msop8(top view) d 9 1 part number marking lot number 1pin mark 0 2
datasheet d a t a s h e e t notice - rev.001 notice precaution for circuit design 1) the products are designed and produced for applicatio n in ordinary electronic equipment (av equipment, oa equipment, telecommunication equipment, home appliances, amusement equipment, etc.). if the products are to be used in devices requiring extremel y high reliability (medical equipment, transport equipment, aircraft/spacecraft, nuclear power controllers, fuel contro llers, car equipment including car accessories, safety devices, etc.) and whose malfunction or operational error may endanger human life and sufficient fail-safe measures, please consult with the rohm sales staff in advance. if product malfunctions may re sult in serious damage, including that to human life, sufficient fail-safe measures must be taken, including the following: [a] installation of protection circuits or other protective devices to improve system safety [b] installation of redundant circuits in the case of single-circuit failure 2) the products are designed for use in a standard environment and not in any spec ial environments. a pplication of the products in a special environment can deteriorate product per formance. accordingly, verification and confirmation of product performance, prior to use, is recomm ended if used under the following conditions: [a] use in various types of liquid, includin g water, oils, chemicals, and organic solvents [b] use outdoors where the products are exposed to direct sunlight, or in dusty places [c] use in places where the products are exposed to sea winds or corrosive gases, including cl 2 , h 2 s, nh 3 , so 2 , and no 2 [d] use in places where the products are exposed to static electricity or electromagnetic waves [e] use in proximity to heat-producing componen ts, plastic cords, or other flammable items [f] use involving sealing or coating the prod ucts with resin or other coating materials [g] use involving unclean solder or use of water or water-soluble cleaning agents for cleaning after soldering [h] use of the products in places subject to dew condensation 3) the products are not radiation resistant. 4) verification and confirmation of performance characte ristics of products, after on- board mounting, is advised. 5) 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. 6) de-rate power dissipation (pd) depending on ambient temperature (ta). when used in sealed area, confirm the actual ambient temperature. 7) confirm that operation temper ature is within the specified range described in product specification. 8) failure induced under deviant condition from what def ined in the product specific ation cannot be guaranteed. precaution for mounting / circuit board design 1) when a highly active halogenous (chlori ne, bromine, etc.) flux is used, the remainder of fl ux may negatively affect product performance and reliability. 2) in principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the company in advance. regarding precaution for mounting / circu it board design, please specially refe r to rohm mounting specification precautions regarding application examples and external circuits 1) if change is made to the constant of an external circuit, allow a sufficient margin due to variations of the characteristics of the products and external components, including transient characteristics, as well as static characteristics. 2) the application examples, their const ants, and other types of information cont ained herein are applicable only when the products are used in accordance with standard methods . therefore, if mass production is intended, sufficient consideration to external conditions must be made.
datasheet d a t a s h e e t notice - rev.001 precaution for electrostatic this product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. please take proper caution during manufacturing and st oring so that voltage exceeding product ma ximum rating won't be applied to products. please take special care under dry condition (e.g. grounding of human body / equipment / so lder iron, isolation from charged objects, setting of ionizer, friction prevention and temperature / humidity control). precaution for storage / transportation 1) product performance and soldered connections may deteriorate if the products are stored in the following places: [a] where the products are exposed to sea winds or corrosive gases, including cl2, h2s, nh3, so2, and no2 [b] where the temperature or humidity exceeds those recommended by the company [c] storage in direct sunshine or condensation [d] storage in 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 recommended storage time period . 3) store / transport cartons in the correct direction, whic h is indicated on a carton as 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 dry bag. precaution for product label qr code printed on rohm product label is only for internal us e, and please do not use at cust omer site. it might contain a internal part number that is inconsistent with an product part number. precaution for disposition when disposing products please dispose them properly with a industry waste company. precaution for foreign exchange and foreign trade act since concerned goods might be fallen under controlled goods prescribed by foreign exchange and foreign trade act, please consult with rohm in case of export. prohibitions regarding industrial property 1) information and data on products, including application exam ples, contained in these specifications are simply for reference; the company does not guarantee any industrial pr operty rights, intellectual property rights, or any other rights of a third party regarding this information or data. ac cordingly, the company does not bear any responsibility for: [a] infringement of the intellectual property rights of a third party [b] any problems incurred by the us e of the products listed herein. 2) the company prohibits the purchaser of its products to exercise or use the in tellectual property rights, industrial property rights, or any other rights that either belong to or are controlled by the company, other than the right to use, sell, or dispose of the products.

▲Up To Search▲

Price & Availability of BD9102FVM

	To Download BD9102FVM Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .