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1/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. single-chip type with built-in fet switching regulator series output 1.5a or less high-efficiency step-down switching regulator with built-in power mosfet bd8313hfn ? description rohm?s output 1.5a or less high-efficiency step-down switching regulator with built-in power mosfet bd8313hfn produces step-down output including 1.2, 1.8, 3.3, or 5 v from 4 batteries, batteries such as li2cell or li3cell, etc. or a 5v/ 12v fixed power supply line. bd8313hfn allows easy production of small power supply by a wide range of external constants, and is equipped with an external coil/capacitor downsized by high frequency operation of 1.0 mhz, built-in synchronous rectification sw capable of withstanding 15 v, and flexible phase compensation system on board. features 1) incorporates pch/nch synchronous rectif ication sw capable of withstanding 1.2 a/15v. 2) incorporates phase compensation device between input and output of error amp. 3) small coils and capacitors to be used by high frequency operation of 1.0mhz 4) input voltage 3.5 v ? 14 v output current 1.2 ? 12 v 1a 5) incorporates soft-start function. 6) incorporates timer latch system short protecting function. 7) as small as 2.9mm3 mm, son 8-pin package hson8 ? application for portable equipment like dsc/dvc powered by 4 dry batteries or li2cell and li3cell, or general consumer-equipment with 5 v/12 v lines ? operating conditions (ta = 25c) parameter symbol voltage circuit unit power supply voltage vcc 3.5 - 14 v output voltage vout 1.2 - 12 v ? absolute maximum ratings *1 when used at ta = 25 or more installed on a 70701.6 t mm board, the rating is reduced by 5.04mw/ . * these specifications are subject to change without advance notice for modifications and other reasons. parameter symbol rating unit maximum applied power voltage vcc, pvcc 15 v maximum input current iinmax 1.2 a power dissipation pd 630 mw operating temperature range topr -25 +85 c storage temperature range tstg -55 +150 c junction temperature tjmax +150 c no.09027ebt05
bd8313hfn technical note 2/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? electrical characteristics (unless otherwise specified, ta = 25 c, vcc = 7.4 v) ? not designed to be resistant to radiation parameter symbol target value unit conditions min typ max [low voltage input malfunction preventing circuit] detection threshold voltage v uv - 2.9 3.2 v vreg monitor hysteresis range v uv hy 100 200 300 mv [oscillator] oscillation frequency fosc 0.9 1.0 1.1 mhz [regulator] output voltage vreg 4.65 5.0 5.35 v [error amp] inv threshold voltage vinv 0.99 1.00 1.01 v input bias current iinv -50 0 50 na vcc = 12.0 v , v inv = 6.0 v soft-start time tss 4.8 8.0 11.1 msec [pwm comparator] lx max duty dmax - - 100 % [output] pmos on resistance r onp - 450 600 m ? nmos on resistance r onn - 300 420 m ? leak current ileak -1 0 1 ua [stb] stb pin control voltage operation v stb h 2.5 - 14 v no-operation v stb l -0.3 - 0.3 v stb pin pull-down resistance r stb 250 400 700 k ? [circuit current] standby current vcc pin i stb1 - - 1 ua pvcc pin i stb2 - - 1 ua circuit current at operation vcc i cc1 - 600 900 ua v inv = 1.2 v circuit current at operation pvcc i cc2 - 30 50 ua v inv = 1.2 v
bd8313hfn technical note 3/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? description of pins ? block diagram pin no. pin name function 1 gnd ground terminal 2 vcc control part power input terminal 3 vreg 5 v output terminal of regulator for internal circuit 4 pgnd power transistor ground terminal 5 lx coil connecting terminal 6 pvcc dc/dc converter input terminal 7 stb on/off terminal 8 inv error amp input terminal fig.1 terminal layout vcc inv vreg pgnd gnd stb pvcc lx fig.2 block diagram stb + - + vref error_amp inv scp osc4000 ount fb h stop osc 1.0mhz vreg stby_io vcc pvcc pgnd lx pwm control timming control pre driver pre driver reference uvlo vref 5v reg 300m 450m vreg osc8000 ount soft start gnd step down on/off
bd8313hfn technical note 4/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? description of blocks 1. reference this block produces error amp standard voltage. the standard voltage is 1.0 v. 2. 5 v reg 5 v low saturation regulator for internal analog circuit bd8313hfn is equipped with this regulator for the purpose of pr otecting the internal circuit fr om voltage. therefore, this output is reduced when vcc is less than 5 v, but there is no problem in use. 3 uvlot circuit for preventing low voltage malfunction prevents malfunction of the internal circuit at activation of the power supply voltage or at low power supply voltage. monitors vcc pin voltage to turn off all output fet and dc/ dc converter output when vcc voltage is lower than 2.9 v, and reset the timer latch of the internal scp circuit and soft -start circuit. this threshold contains 200 mv hysteresis. 4 scp timer latch system short-circuit protection circuit when the inv pin is the set 1.0 v or lower volt age, the internal scp circuit starts counting. the internal counter is in synch with osc; the latch circ uit activates about 4 msec after the counter counts about 4000 oscillations to turn off dc/dc converter output. to reset the latch circuit, turn off the stb pin once. then, turn it on again or turn on the power supply voltage again. 5 osc circuit for oscillating sawtooth waves with an operation frequency fixed at 1.0 mhz 6 error amp error amplifier for detecting output si gnals and output pwm control signals the internal standard voltage is set at 1.0 v. a primary phase compensation device of 200 pf, 62 k ? is built in-between the invert ing input terminal and the output terminal of this error amp. 7 pwm comp voltage-pulse width converter for controlling output voltage corresponding to input voltage comparing the internal slope waveform with the error amp output voltage, pwm comp controls the pulse width to the output to the driver. 8 soft start circuit for preventing in-rush current at startup by bringing the output voltage of the dc/dc converter into a soft-start soft-start time is in synch with the internal osc, and t he output voltage of the dc/dc co nverter reaches the set voltage after about 8000 oscillations. 9 pre driver/timing control cmos inverter circuit for driving the built-in synchronous rectification sw the synchronous rectification off time fo r preventing feedthrough is about 25 nsec. 10 stby_io voltage applied on stb pin (7 pin) to control on/off of ic turned on when a voltage of 2.5 v or higher is applied an d turned off when the terminal is open or 0 v is applied. incorporates approximately 400 k ? pull-down resistance. 11 pch/nch fet sw built-in synchronous rectification sw for switch ing the coil current of the dc/dc converter incorporates a 450 m ? pchfet sw capable of withstanding 15 v.and 300 m ? sw capable of withstanding 15 v. since the current rating of this fet is 1.2 a, it should be used within 1.2 a including the dc current and ripple current of the coil.
bd8313hfn technical note 5/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? reference data unless otherwise specified, ta = 25c, vcc = 7.4 v 0.98 0.99 1.00 1.01 1.02 -40 -20 0 20 40 60 80 100 120 temperature [] inv threshold [v] 4.7 4.8 4.9 5.0 5.1 5.2 5.3 -40 0 40 80 120 temperature [] vreg voltage [v] fig.3. inv threshold temperature property fig.7. fosc temperature property fig.5. vreg output temperature property fig.10. nch fet on resistance temperature property 100 200 300 400 500 -40 0 40 80 120 temparature [] on resistance [ m ] fig.9. uvlo threshold temperature property 0.98 0.99 1.00 1.01 1.02 02468101214 vcc [v] inv threshold [v] fig.4. inv threshold power supply property 0 1 2 3 4 5 6 7 8 02468101214 vcc [v] vreg[v] fig.6. vreg outpu t power supply property fig.8. fosc voltage property fig.11. nch fet on resistance power supply property id=500ma 0 100 200 300 400 500 600 3 6 9 12 15 vcc [v] on resistance [ m] id=500ma 2.50 2.70 2.90 3.10 3.30 3.50 -40 0 40 80 120 h? ta [ ] ??? ?R vhys [v] 0.00 0.05 0.10 0.15 0.20 0.25 uvlo detection voltage hysteresis width uvlo release voltage environmental temperature ta [ c] hysteresis voltage vhys[v] 0.8 0.9 1.0 1.1 1.2 -40 0 40 80 120 temperature [] frequency [mhz] 0.8 0.9 1.0 1.1 1.2 3691 21 5 vcc [v] frequency [ mhz ]
bd8313hfn technical note 6/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. 0 200 400 600 800 -40 0 40 80 120 temparature [] swout on resistance [ ] 0 200 400 600 800 1000 3691215 vcc [v] swout on resistance [ ] 1.0 1.5 2.0 2.5 -50 0 50 100 150 ta [] stb voltage [v] on off fig.12. pch fet on resistance temperature property fig.13. pch fet on resistance power supply property 0 200 400 600 800 1000 -40 0 40 80 120 temparature [] icc [ua] fig.15. circuit current temperature property 0 200 400 600 800 1000 02468101214 vcc [v] icc [ua] fig.16. circuit current voltage property id=500ma id=500ma fig.14. stb threshold temperature property
bd8313hfn technical note 7/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? example of application1 input: 4.5 to 10 v, output: 3.3 v / 500ma vreg pgnd vcc gnd pvcc inv lx stb vbat=4.510v 1f grm188b11a105ka61 murata 4.7h 1127as4r7mtoko 10f grm31cb11a106ka01 murata 51k 22k 200k 68k 10pf 3.3v/500ma on/off 1f grm188b11a105ka61 murata 10f grm31cbe106ka75l murata ? reference application data 1 (example of application1) fig.17 reference application diagram1 0 20 40 60 80 100 1 10 100 1000 output current [ma] efficiency [%] vcc=4.5v vcc=5.5v vcc=7.5v fig.18 power conversion efficiency (vout = 3.3 v) fig.19 load regulation (vout = 3.3 v) 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 1 10 100 1000 output current [ma] output voltage [v] vcc=7.5v vcc=5.5v vcc=4.5v
bd8313hfn technical note 8/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? reference application data 2 (input 4.5 v, 6.0 v, 8.4 v, 10 v, output 3.3 v ) (example of application1) -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency[hz] gain[db] -180 -120 -60 0 60 120 180 phase[deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency[hz] gain[db] -180 -120 -60 0 60 120 180 phase[deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency[hz] gain[db] -180 -120 -60 0 60 120 180 phase[deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency[hz] gain[db] -180 -120 -60 0 60 120 180 phase[deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency[hz] gain[db] -180 -120 -60 0 60 120 180 phase[deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency[hz] gain[db] -180 -120 -60 0 60 120 180 phase[deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency[hz] gain[db] -180 -120 -60 0 60 120 180 phase[deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency[hz] gain[db] -180 -120 -60 0 60 120 180 phase[deg] cccc phase gain phase gain phase gain phase gain phase gain fig.21 frequency response 2 (vcc=6.0v, io=250ma) fig.20 frequency response 1 (vcc=4.5v, io=250ma) phase gain phase gain fig.23 frequency response 4 (vcc=10v, io=250ma) fig.25 frequency response 6 (vcc=6.0v, io=500ma) fig.26 frequency response 7 (vcc=8.4v, io=500ma) fig.27 frequency response 8 (vcc=10v, io=500ma) fig.24 frequency response 5 (vcc=4.5v, io=500ma) fig.22 frequency response 3 (vcc=8.4v, io=250ma) phase gain
bd8313hfn technical note 9/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? example of application2 input4.5 12v, output1.2v / 500ma ? reference application data 1 (example of application2) vreg pgnd vcc gnd pvcc inv lx stb vbat=4.5~ 12v 1f grm188b11a105ka61 ( murata) 4.7h 1f grm188b11a105ka61 ( murata) 10f 2para grm31cb11a106ka01 ( murata) 20ko 100ko 560ko 68ko 10pf 3.3v/500ma on/off 10f grm31cb31e106ka75l (murata) 100o nr4012-4r7m (taiyo yuden) fig.28 reference application diagram2 fig.29 power conversion efficiency (vout = 1.2 v) fig.30 load regulation (vout = 1.2 v) 1.00 1.06 1.12 1.18 1.24 1.30 1.36 1 10 100 1000 output current [ma] efficiency [%] vcc=12v vcc=5.0v vcc=7.4v 0 20 40 60 80 100 1 10 100 1000 output current [ma] efficiency [%] vcc=7.4v vcc=5.0v vcc=12v
bd8313hfn technical note 10/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? reference application data 2 input5.0v, 7.4v, 10v output1.2v example of application 2 -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 fr eq uency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] phase gain phase gain phase gain phase gain phase gain phase gain phase gain phase gain -60 -40 -20 0 20 40 60 100 1000 10000 100000 1000000 frequency [hz] gain [db] -180 -120 -60 0 60 120 180 phase [deg] phase gain fig.31 frequency response 1 (vcc = 5.0v, io = 100ma) fig.32 frequency response 2 (vcc = 5.0v, io = 300ma) fig.33 frequency response 3 (vcc = 5.0v, io = 900ma) fig.34 frequency response 4 (vcc = 7.4v, io = 100ma) fig.35 frequency response 5 (vcc = 7.4v, io = 300ma) fig.36 frequency response 6 (vcc = 7.4v, io = 900ma) fig.37 frequency response 7 (vcc = 10v, io = 100ma) fig.38 frequency response 8 (vcc = 10v, io = 300ma) fig.39 frequency response 9 (vcc = 10v, io = 900ma)
bd8313hfn technical note 11/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? output ripple voltage bd8313hfn is controlled by pwm(pulse width modulation)mode. pwm output made by comparison slope with fb(error amp output) controls switching of ic under the pwm mode. when fb level is completely lower than slope level, dc/dc converter switches as non- synchronous step-down switching mode not to make output voltage level drop quickly caused by full on state of low side nch fet. ripple voltage of output voltage in non-synchronous mode is larger than that in synchronous mode. when voltage difference between input and output voltage is large and output current is small, dcdc converter switches as this non-synchronous mode then ripple volt age of output voltage could be large. in the reference data above ( output ripple 1 to 4 ), ripple vo ltage at 12v input 1.2v output , output current is smaller than 100ma is larger than other region. 0.75 0.25 fb slope pwmoutput vout(20m/div) ?=24.4mvp-p 20usec/div ?=10.4mvp-p ?=38.4mvp-p ?=9.2mvp-p ?=14.8mvp-p fig.40 output ripple 1 (vcc=12v, io=40ma) 24.4mvpp fig.41 output ripple 2 (vcc=12v, io=100ma) fig.42 output ripple 3 (vcc=12v, io=140ma) fig.43 output ripple 4 (vcc=12v, io=170ma) fig.44 output ripple 5 (vcc=12v, io=900ma) 38.4mvpp 9.2mvpp 10.4mvpp 14.8mvpp vout(20m/div) 20usec/div vout(20m/div) 20usec/div vout(20m/div) 20usec/div vout(20m/div) 20usec/div
bd8313hfn technical note 12/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? reference board pattern the radiation plate on the rear should be a gnd flat surface of low impedance in common with the pgnd flat surface. it is recommended to install a gnd pin in another system as shown in the drawing without connecting it directly to this pngd. produce as wide a pattern as possible for the vbat, lx and pgnd lines in which large current flows. ? selection of part for applications (1) inductor a shielded inductor that sa tisfies the current rating (current value, ipecac as shown in the drawing below) and has a low dcr (direct resistance component) is recommended. inductor values affect inductor ripple current, which will cause output ripple. ripple current can be reduced as the coil l value becomes larger and the switching frequency becomes higher. ipeak =iout S il/2 [a] ???(1) ( : efficiency, S il: output ripple current, f: switching frequency) as a guide, inductor ripple current should be set at about 20 to 50% of the maximum input current. *current over the coil rating flowing in the coil brings the coil into magnetic satura tion, which may lead to lower efficiency or output oscillation. select an induc tor with an adequate margin so that t he peak current does not exceed the rated current of the coil. (2) output capacitor a ceramic capacitor with low esr is recommended for output in order to reduce output ripple. there must be an adequate margin between the maximum rating a nd output voltage of the capacitor, taking the dc bias property into consideration. output ripple voltage is acquired by the following equation. setting must be performed so that output ripple is within the allowable ripple voltage. vpp= Sil S il r esr [v] ???(3) 2 f co 1 <1:? : S il= [a] ???(2) l vin-vout vin vout f 1 fig.45 inductor current vout vbat gnd lx
bd8313hfn technical note 13/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. (3) output voltage setting the internal standard voltage of the error amp is 1.0 v. output voltage is acquired by equation (4). (4) dc/dc converter frequency response adjustment system condition for stable application the condition for feedback system stability under negative feedba ck is that the phase delay is 135 or less when gain is 1 (0db). since dc/dc converter application is sampled according to the switching frequency, the bandwidth gbw of the whole system (frequency at which gain is 0 db) must be controlled to be equal to or lower than 1/10 of the switching frequency. in summary, the conditions necessary for the dc/dc converter are: - phase delay must be 135or lower when gain is 1 (0 db). - bandwidth gbw (frequency when gain is 0 db) must be equ al to or lower than 1/10 of the switching frequency. to satisfy those two points, r 1 , r 2 , r 3 , d s and r s in fig. 47 should be set as follows. [1] r 1 , r 2 , r 3 bd8313hfn incorporates phase compensation devices of r4=62k ? and c2=200pf. these c2 and r 1 , r 2 , and r 3 values decide the primary pole that det ermines the bandwidth of dc/dc converter. primary pole point frequency dc/dc converter dc gain by equations (1) and (2), the frequency fsw of point 0 db under limitation of the bandwidth of the dc gain at the primary pole point is as shown below. f sw = fpdc gain = it is recommended that fsw should be approx.10 khz. when load response is difficult, it may be set at approx. 20 khz. by equation (3), r 1 and r 2 , which determine the voltage value, will be in the order of several hundred k ? . if an appropriate resistance value is not available since the resist ance is so high and routing ma y cause noise, the use of r 3 enables easy setting. vo= 1.0 [v] ??? (4) r2 (r1+r2) vref 1.0 v vout error amp r1 r2 inv fig.47 example of phase compensation setting fb vout c2 r1 r2 rs r4 cs r3 inside of ic a: error amp gain about 100db = 10 5 b: oscillator amplification = 0.5 v in: input voltage v out : output voltage ????(1) ????(2) 2 a ( +r 3 )c 2 fp= 1 r 1 r 2 r 1 +r 2 dc gain =a b 1 v o v in 2 c 2 ( +r 3 ) (r 1+ r 2 ) (r 1 ? r 2 ) 1 ????(3) b 1 v o v in fig.46 setting of voltage feedback resistance
bd8313hfn technical note 14/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. [2] cs and rs setting in the step-up dc/dc converter, the sec ondary pole point is caused by the coil and capacitor as expressed by the following equation. f lc = this secondary pole causes a phase rotation of 180. to secure t he stability of the system, put a zero point in 2 places to perform compensation. zero point by built-in cr f z1 = = 13khz zero point by cs f z1 = setting f z2 to be half to 2 times a frequency as large as f lc provides an appropriate phase margin. it is desirable to set rs at about 1/20 of (r 1 +r 3 ) to cancel any phase boosting at high frequencies. those pole points are summarized in the figure below. the actual frequency property is different from the ideal calculation because of part constants. if possible, check the phase margin with a frequency analyzer or network analyzer. otherwise, check for the presence or absence of ringing by load response waveform and also check for the presence or absence of oscillation under a load of an adequate margin. 2 (lc) 1 ????(4) 2 r 4 c 2 1 2 (r 1+ r 3 )c s 1 (5) ????(5) ????(6) (6) (4) (3) fig.48 example of dc/dc converter frequency property measured with fra5097 by nf corporation
bd8313hfn technical note 15/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? i/o equivalence circuit stb inv vcc stb vreg vcc inv lx, pgnd, pvcc lx pgnd pvcc vreg vcc vreg vcc
bd8313hfn technical note 16/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? ordering part number 1) absolute ma ximum rating we dedicate much attention to the quality control of these prod ucts, however the possibility of deterioration or destruction ex ists if the impressed voltage, operating temperat ure range, etc., exceed the absolute maximum ratings. in addition, it is impossible to predict all destructive situations such as short-circuit modes, open circuit modes, et c. if a special mode exceeding the absolu te maximum rating is expected, please review matters and provide physical sa fety means such as fuses, etc. 2) gnd potential keep the potential of the gnd pin below th e minimum potential at all times. 3) thermal design work out the thermal design with sufficient margin taking power dissipation (pd) in the actual operation condition into account . 4) short circuit between pins and incorrect mounting attention to ic direction or displacement is required when installing the ic on a pcb. if the ic is installed in the wrong way, it may break. also, the threat of destruction from short-circ uits exists if foreign matter invades between outputs or the output and gnd of the power supply. 5) operation under strong electromagnetic field be careful of possible malfunctions under strong electromagnetic fields. 6) common impedance when providing a power supply and gnd wirings, show sufficient consideration for lowering common impedance and reducing ripple (i.e., using thick short wiring, cutting ripple down by lc, etc.) as much as you can. 7) thermal protection circuit (tsd circuit) bd8313hfn contains a thermal protection circuit (tsd circuit) . the tsd circuit serves to shut off the ic from thermal runaway and does not aim to protect or assure operation of the ic itself. therefore, do not use the tsd circuit for continuous use or operation af ter the circuit has tripped. 8) rush current at the time of power activation be careful of the power supply coupling capacity and the width of the power supply and gnd pattern wiring and routing since rush current flows instantaneously at the time of power activation in the case of cmos ic or ics with multiple power supplies. 9 ) ic terminal input this is a monolithic ic and has p+ isolation and a p substr ate for element isolation between each element. p-n junctions are formed and various parasitic elements are configured using these p layers and n layers of the individual elements. for example, if a resistor and transistor are connected to a terminal as shown on fig.49: the p-n junction operates as a parasitic diode when gnd > (terminal a) in the case of a resistor or when gnd > (terminal b) in the case of a transistor (npn) also, a parasitic npn transistor operates using the n layer of another element adjacent to the previous diode in the case of a transistor (npn) when gnd > (terminal b). the parasitic element consequently rises under the potential re lationship because of the ic?s structure. the parasitic element pulls interference that could cause malfunctions or des truction out of the circuit. ther efore, use caution to avoid the operation of parasitic elements caused by applying volt age to an input terminal lower than the gnd (p board), etc. fig.49 example of simple structure of bipolar ic parasitic element (pin a) gnd p substrate n p n p p (pin a) parasitic element resistor parasitic element transistor ( npn) gnd p substrate n p n p p (pin b) b n e c gnd n
bd8313hfn technical note 17/17 www.rohm.com 2009.04- rev.b ? 2009 rohm co., ltd. all rights reserved. ? ordering part number b d 8 3 1 3 h f n - t r part no. part no. package hfn:hson8 packaging and forming specification tr: embossed tape and reel (unit : mm) hson8 s 0.08 m 0.1 s 0.320.1 0.65 0.02 +0.03 ?0.02 0.6max 8765 43 12 2.8 0.1 2.9 0.1 3.0 0.2 (max 3.1 include burr) 0.475 1pin mark 5 4 6 32 7 1 8 (0.2) (1.8) (0.15) (2.2) (0.3) (0.45) (0.2) (0.05) 0.13 +0.1 ?0.05 direction of feed reel ? 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 right when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs tr () 1pin
r0039 a www.rohm.com ? 2009 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 products. 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.

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