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1 / 18 02.mar.2012 rev.001 www.rohm.com tsz02201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserv ed. tsz22111 ? 14 ? 001 2.7v to 5.5v, 3a 1ch synchronous buck converter integrated fet BD8962MUV general description rohms high efficiency step - down switching regulator bd 8962muv is a power supply designed to produce a low voltage including 0. 8 volts from 5 .5/3.3 volts pow er supply line. offers high efficiency with 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 h ighly efficiency for all load range with synchronous rectifier (nch/ n ch fet) ? incorporates soft - start function. ? incorporates thermal protection and ulvo functions. ? incorporates short - current protection circuit with time delay function. ? incorporates shutdown function . key specifications ? i nput voltage range: 2.7v to 5.5v ? o utput voltage range: 0.8v to 2.5v ? average output current: 3.0a ( max. ) ? switching frequency: 1mhz(typ.) ? highside fet on resistance: 82m (typ.) ? lowsaide fet on resistance: 70m (typ.) ? s tandby current: 0 a( t yp. ) ? operating temperature range: - 40 to +105 packages vqfn020v4040 4.0mm x 4.0mm x 1.0mm applications p ower supply for lsi including dsp, micro computer and asic typical application circuit fi g. 1 typical application circuit product structure silicon monolithic integrated circuit this product is not designed protection against radioactive rays.
2 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 pin configuration pin description pin no. pin name function pin no. pin name function 1 sw sw pin 11 gnd ground 2 sw sw pin 12 adj output voltage detect pin 3 sw sw pin 13 ith gmamp output pin/connected phase compensation capacitor 4 sw sw pin 14 n. c. non connection 5 sw sw pin 15 n.c. non connection 6 pvcc highside fet source pin 16 n.c. non connection 7 pvcc highside fet source pin 17 en enable pin(high active 8 pvcc highside fet source pin 18 pgnd lowside fet source pin 9 bst bootstrapped vo ltage input pin 19 pgnd lowside source pin 10 vcc vcc power supply input pin 20 pgnd lowside source pin block diagram p vcc en pgnd gnd n.c. fig. 2 pin configuration bst vcc a d j ith n.c. sw top view fig.3 block diagram 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11
3 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 absolute maximum ratings (ta=25 ) parameter symbol limit units v cc voltage v cc - 0.3 to +7 * 1 v pv cc vo ltage pv cc - 0.3 to +7 * 1 v bst voltage v bst - 0.3 to +13 v bst_sw voltage v bst - sw - 0.3 to +7 v en voltage ven - 0.3 to +7 v sw,ith voltage vsw, vith - 0.3 to +7 v power dissipation 1 pd1 0.34 * 2 w power dissipation 2 pd2 0.70 * 3 w power dissipation 3 p d3 1.21 * 4 w power dissipation 4 pd4 3.56 * 5 w operating temperature range topr - 40 to +105 1 pd should not be exceeded . 2 ic only 3 1 - layer . mounted on a 74.2mm 74.2mm 1.6mm glass - epoxy board, occupied area by copper foil : 10.29mm 2 4 4 - la yer . mounted on a 74.2mm 74.2mm 1.6mm glass - epoxy board, occupied area by copper foil : 10.29mm 2 , i n each layers 5 4 - layer . mounted on a 74.2mm 74.2mm 1.6mm glass - epoxy board, occupied area by copper foil : 5505mm 2 , i n each layers operating ratings ( ta= - 40 to +105 ) parameter symbol ratings units min. typ. max. power supply voltage v cc 2.7 3.3 5.5 v pv cc 2.7 3.3 5.5 v en voltage ven 0 - 5.5 v output voltage setting range v out 0.8 - 2.5* 6 v sw average output current i sw - - 3.0* 7 a 6 i n case set output voltage 1.6v or more, vccmin = vout+1.2v . 7 pd should not be exceeded. electrical characteristics (ta=25 v cc =pv cc =3.3v, en=v cc , r 1 =10k , r 2 =5k , unless otherwise specified. ) parameter symbol limit units conditions min. typ. max. standby current i stb - 0 10 cc - 250 500 enl - gnd 0.8 v standby mode en high voltage v enh 2.0 vcc - v active mode en input current i en - 1 10 en =3.3v oscillation frequency f osc 0.8 1 1.2 mhz high side fet on resistance r on h - 82 115 m cc =3.3v low side fet on resistance r on l - 70 98 m cc =3.3v adj voltage v adj 0.788 0.800 0.812 v ith si nk current i thsi 10 18 - adj =1v ith s ource c urrent i thso 10 18 - adj =0.6v uvlo threshold voltag e v uvlo 1 2.400 2.500 2.600 v v cc =3.3v uvlo 2 2.425 2.550 2.700 v v cc =0v ss 2.5 5 10 ms timer latch time t latch 0.5 1 2 ms output short circuit threshold voltage v scp - 0.40 0.56 v v adj =0.8v
4 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 typic al performance curves fig.4 vcc - vout fig.6 iout - vout fig.7 ta - vout fig.5 ven - vout
5 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 fig. 11 ta - ven fig.9 ta - fosc fig.8 efficiency fig. 10 ta C
6 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 fig. 1 2 ta - icc fig.13 vcc - fosc fig.14 soft start waveform fig. 1 5 sw waveform io=10ma
7 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 fig. 16 transient response io=1
8 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 application information operation bd8962 muv is a synchronous rectifying step - down switching regulator that achieves faster transient response by employing current mode pwm c ontrol system. synchronous rectifier it does not require the power to be dissip ated 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 which 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 highside mos fet (while a lowsi de mos fet is turned off), and a n inductor current i l increases. the current comparator (current comp) receives two signals, a current feedback control signal (sense: voltage converted from i l ) and a voltage feedback control signal (fb), and issues a rese t signal if both input signals are identical to each other, and turns off the highside mos fet (while a lowside mos fet is turned on) for the rest of the fixed period. the pwm control repeat this operation. fig. 1 8 diagram of current mode pwm control osc level shift driver logic r q s i l sw ith current comp gm amp. set reset fb load sense v out v out fig. 1 9 pwm switching timing chart current comp set reset sw v out pvcc gnd gnd gnd i l (ave) v out (ave) sense fb i l
9 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 description of operatio ns ? 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 o f 50 mv (typ.) is provided to prevent output chattering. fig.20 soft start, shutdown, uvlo timing chart ? sh ort - 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 the fixed time(t latch ) or more . the output thus held tuned off may be recover ed by restarting en or by re - unlocking uvlo. fig.2 1 short - current protection circuit with time delay timing chart hysteresis 50mv 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 1/2v out 1msec output voltage off latch output current in non - control output current in control by limit value (with fall of the output voltage, limit value goes down) en timer latch en standby mode operated mode standby mode operated mode en v out limit i l until output voltage goes up the half of v o or over, timer latch is not operated. (no timer latch, only limit to the output current)
10 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 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 about 5 0%. fig. 2 2 comparison of transient response advantage 2 offers high efficiency for all load r ange with synchronous rectifier . utilizes the synchronous rectifying mode and the low on - resistance mos fets incorporated as power transistor. o n resistance of highside mos fet : 82m (typ.) on resistance of lowside mos fet : 70m (typ.) advantage 3 ? supplied in smaller package due to small - sized p ower mos fet incorporated. reduces a mounting area required. fig.24 example application fig. 2 3 efficiency conventional product ( load response i o =1a 3a) BD8962MUV ( load response i o =1a 3a) ? output c apacitor co required for current mode control: 22 f ceramic capacitor ? inductance l required for the operating frequency of 1 mhz: 2.2 h inductor ? incorporates fet + boot strap diode v out i out 145mv v out i out 62mv output pgnd gnd gm amp r s q osc uvlo tsd + v cc vcc clk slope en current comp soft start current sense/ protect + driver logic + vref ith adj r ith c ith r1 r2 pvcc sw pvcc bst vcc 3.3v input scp 15mm 20mm r 2 c ith c f co l r 1 r ith rf c bst c in vcc=5v ta=25 vout=1.2 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 10000 output current:i out [ma] efficiency: [%]
11 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 switching regulator efficiency efficiency ? may be expressed by the equation shown b elow: efficiency may be improved by reducing the switching regulator power dissipation 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 d issipation pd(sw) 4) esr dissipation of capacitor pd(esr) 5) operating current dissipation of ic pd(ic) 1)pd(i 2 r)=i out 2 (r coil +r on ) (r coil [ ] d c resistance of inductor , r on [ ] on resistance of fet , i out [a] output current. ) 2)pd(gate)=cgs f v (cgs[f] gat e capacitance of fet , f[h] switching frequency , v[v] gate driving voltage of fet ) 4)pd(esr)=i rms 2 esr (i rms [a] ripple current of capacitor , esr[ ] equivalent series resistance. ) 5)pd(ic)=vin i cc (i cc [a] circuit current. ) consideration on permis sible dissipation and heat generation as this ic functions with high efficiency without significant heat generation in most applications, no special consideration is needed on permissible dissipation or heat generation. in case of extreme conditions, howe ver, including lower input voltage, higher output voltage, heavier load, and/or higher temperature, the permissible dissipation and/or heat generation must be carefully considered. for dissipation, only conduction losses due to dc resistance of inductor a nd on resistance of fet are considered. because the conduction losses are considered to play the leading role among other dissipation mentioned above including gate charge/discharge dissipation and switching dissipation. = v out i out vin iin 100[% ] = p out pin 100[% ] = p out p out +p d 100[% ] vin 2 c rss i out f i drive 3)pd(sw)= (c rss [f] reverse transfer capacitance of fet , i drive [a] peak current of gate. ) p=i out 2 r on r on =d r onp +(1 - d)r onn d on duty (=v out /v cc ) r onh on resistance of highside mos fet r onl on resistance of lowside mos fet i out output curr ent fig.25 thermal derating curve (vqfn020v4040) power dissipation:pd [w] ambient temperature:ta [ ] 0 2 5 50 75 100 125 150 0 2.0 3.0 4.0 1.21w 3.56w 1.0 0.70w 0.34w 2 ) copper foil in each layers. 2 ) copper foil in each layers. 2 ) 105
12 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 if v cc =3.3v, v out =1.8v , r onh =82m , r onl =70m i out =3a, for example, d=v out /v cc =1.8/3.3=0.545 r on =0.545 0.082+(1 - 0.545) 0.07 =0.0447+0.0319 =0.0766[ ] p=3 2 0.0766 0.6894[w] as r on h is greater than r on l in this ic, the dissipation increases as the on duty becomes greater. with the c onsideration on the dissipation as above, thermal design must be carried out with sufficient margin allowed. selection 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 efficiency. t he inductor must be selected allowing sufficient margin with which the peak current may not exceed its current rating. if v cc =5.0v, v out =2.5v, f=1mhz, i l =0.2 3a =0.6a , for example, (BD8962MUV) select the inductor of low resistance component (such as dcr and acr) to minimize dissipation in the inductor for better efficiency. 2. selection of output capacitor (c o ) 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. l = (v cc - v out ) out l cc ??? app ropriate ripple current at output should be 20% more or less of the maximum output current. l =0.2 out max. [a] ??? cc - v out ) out l cc ??? l : output ripple current, and f: switching frequency ) (5 - 2.5) v out fig.26 output ripple current i l i l v cc il l co output capacitor should be selected with the consideration on the stability region and the equivalent series resistance required to smooth ripple voltage. output ripple voltage is deter mined by the equation (4) out = l ??? l : output ripple current , esr: equivalent series resistance of output capacitor ) rating of the capacitor should be determined allowing sufficient margin against output voltage. a 22 f to 100 f cera mic capacitor is recommended. less esr allows reduction in output ripple voltage. fig.27 output capacitor v cc l co v out esr
13 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 3. selection of input c apacitor (cin) a low esr 22 f/10v ceramic capacitor is recommended to reduce esr dissipation of input capacitor for better efficiency. 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 consisting of a output capacitor and a load resistance, while a zero (phase lead) appears in the high frequency area due to the ou tput capacitor and its esr. so, the phases are easily compensated by adding a zero to the power amplifier output with c and r as described below to cancel a pole at the power amplifier. input capacitor to select must be a low esr capacitor of the capacitance sufficient to cope with high ripple current to prevent high transient volt age. the ripple current i rms is given by the equation ( 5 ): i rms =i out out (v cc - v out ) v cc [a] ??? out , i rms = i out 2 < worst case > i rms(max.) i rms =2 rms ] v out v cc l co cin if v cc =3.3v, v out =1.8v, and i outmax.= 3a, (BD8962MUV) gain [db] phase [deg] fig.29 open loop gain characteristics a 0 0 - 90 a 0 0 - 90 fz(amp.) fig. 30 error amp phase compensation characteristics fp= 2 o o 1 fz (esr) = 2 sr o 1 pole at power amplifier when the output current decreases, the load resistance ro inc reases and the pole frequency lowers. fp (min.) = 2 omax. o 1 [hz] (max.) = 2 omin. o 1 [hz] (amp.) = 2 ith ith 1 fp(min.) fp(max.) fz(esr) i out min. i out max. gain [db] phase [deg] increasing capaci tance of the output capacitor lowers the pole frequency while the zero frequency does not change. (this is because when the capacitance is doubled, the capacitor esr reduces to half.)
14 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 stable feedback loop may be achieved by canceling the pole fp (min.) produced by the output capacitor and the load resistance with cr zero correction by the error amplifier. 5. deter mination of output voltage the output voltage v out is determined by the equation ( 6 ): v out =(r2/r1+1) v adj ??? (6) 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 : 0.8v to 2.5v fig.32 determination of output voltage use 1 k? to 100 k? resistor for r1. if a resistor of the resistance higher than 100 k? is used, check the assembled set carefully for ripple voltage etc. fig. 3 1 typical application fz (amp.) = fp (min.) 2 ith ith 1 = 2 omax. o 1 sw 6 1 adj l co r2 r1 output vo=2.5v vo=2.0v vo=1.8v fig.33 minimum input voltage in each output voltage the lower limit of input voltage depends on the output voltage. basically, it is recommended to use in the condition : v ccmin = v out +1.2v. fig.33. shows the necessary output current value at the lower limit of input voltage. (dcr of inductor : 20m 2.7 2. 9 3.1 3.3 3.5 3.7 0 1 2 3 input voltage : vcc[v] output current : iout [ a ]
15 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 BD8962MUV cautions on pc board layout fig.34 layout diagram lay out the input ceramic capacitor c in closer to the pins pv cc and pgnd, and the output capacitor c o closer to the pin pgnd. lay out c ith and r ith between the pins ith and gnd as neat as possible with least necessary wiring. vqfn020v4040 (bd8962 muv) has thermal pad on the reverse of the package. the package thermal performance may be enhanced by bonding the pad to gnd plane which take a large area of pcb. recommended components lists on above application symbol part value manufacturer series l coil 2.0uh s umida cdr6d28mnp - 2r0nc 2.2uh s umida cdr6d26np - 2r2nc c in ceramic capacitor 22uf murata grm32eb11a226ke20 c o ceramic capacitor 22uf murata grm31cb30j226ke18 c ith ceramic capacitor v out =1.0v 1500pf murata c rm1 8 serise v out =1.2v 1000pf mu rata g rm 18 serise v out =1.5v 1000pf murata g rm 18 serise v out =1.8v 560pf murata g rm 18 serise v out =2.5v 560pf murata g rm 18 serise r ith resistance v out =1.0v 5.6k rohm mcr03 serise v out =1.2v 6.8k rohm mcr03 serise v out =1.5v 6.8k rohm mcr03 serise v out =1.8v 8.2k rohm mcr03 serise v out =2.5v 12k rohm mcr03 serise cf ceramic capacitor 1000 pf murata g rm 18 serise rf resistance 10 rohm mcr03 seris e c bst ceramic capacitor 0.1 uf murata g rm 18 serise the parts list presented above is an example of recommended parts. although the parts are sound, actual circuit characteristics should be checked on your application carefully before use. be sure to a llow sufficient margins to accommodate variations between external devices and this ic when employing the depicted circuit with other circuit constants modified. both static and transient characteristics should be considered in establishing these margins. when switching noise is substantial and may impact the system, a low pass filter should be inserted between the vcc and pvcc pins, and a schottky barrier diode or snubber established between the sw and pgnd pins.
16 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 i/o equivalence circuit BD8962MUV fig.35 i/o equivalence circuit en ? en pin ? sw pin pv cc sw pv cc pv cc ith ? ith pin v cc ? adj pin adj pv cc bst ? bst pin pv cc sw
17 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 operational notes 1. absolute maximum ratings while utmost care is ta ken 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 conditions . 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 between output terminals, or between output and power supply or gnd may also cause breakdown. 4. thermal shutdown protection 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. 5. 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 each process to avoid stress to the ic. for electrostatic protection, provide proper groundin g 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. 6. 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 element are formed. if a resistor is joined to a transistor terminal as shown in fig 36. p - n j unction 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 gnd>terminal b (at npn transistor side), a parasitic npn transistor is activated by n - layer o f other element adjacent to the above - mentioned parasitic diode. the structure of the ic inevitably forms parasitic elements, the activation of which may cause interference among circuits, and/or malfunctions contributing to breakdown. it is therefore req uested 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.36 simplified structure of monorisic ic 7. g round 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 - signal gnd pattern and establish a single ground at the reference point of the set pcb so that resi stance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small - signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. 8 . selection of induc tor it is recommended to use an inductor with a series resistance element (dcr) 0.1 or less. especially, in case output voltage is set 1.6v or more, note that use of a high dcr inductor will cause an inductor loss, resulting in decreased output voltage. s hould this condition continue for a specified period (soft start time + timer latch time), output short circuit protection will be activated and output will be latched off. when using an inductor over 0.1 , be careful to ensure adequate margins for variati on between external devices and this ic, including transient as well as static characteristics. furthermore, in any case, it is recommended to start up the output with en after supply voltage is within operation range. 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 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 parasitic element pin b other adjacent elements e b c gnd parasitic element
18 / 18 BD8962MUV data s heet 02.mar.2012 rev.001 www.rohm.com tsz2201 - 0j3j0aj00030 - 1 - 2 ? rohm co., ltd. all rights reserved. tsz22111 ? 15 ? 001 orde ring information b d 8 9 6 2 m u v e 2 part number package muv: vqfn0 20 v 4040 packaging and forming specification e2: embossed tape and reel physical dimension tape and reel information vqfn020v4040 (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) tape quantity direction of feed embossed carrier tape 25 00pcs e2 when you order , please order in times the amount of package quantity. reel direction of feed 1pin 1234 1234 1234 1234 1234 1234 (unit:mm) vqfn020v4040 (top view) d 8 9 6 2 part number m arking lot number 1pin mark
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.

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