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technical note single-chip built-in fet type switching regulator series simple step-down switching regulator with integrated compensation BD9701FP/cp-v5/t/t-v5, bd9703fp/cp-v5/t/t-v5, bd9702cp-v5/t/t-v5 description the bd9701/bd9703/bd9702 are singl e-channel step-down switching regulator capable of pwm operation. the pch mos fet is built in for high efficiency i n small load a rea. lower electricity consumption of operat ing current 4ma (typ) and stand-by current 0ua(typ) is realized by adopting bi-cmos process. features 1. maximum switching current: 1.5a(bd9701/bd9703), 3a(bd9702) 2. built-in pch fet ensures high efficiency 3. output voltage adjustable via external resistors 4. high switching frequency: 100khz (bd9701), 300khz(bd970 3), 110khz(bd9702) 5. overcurrent and thermal shutdown protection circuits bu ilt in 6. on/off control via stby pin 7. small surface mount to252-5 package (only BD9701FP, bd9 703fp) applications tvs, printers, dvd players, proj ectors, gaming devices, pcs, ca r audio/navigation systems, etcs, communication equipment, av products, office equipment, indu strial devices, and more. line up BD9701FP/cp-v5/t/t-v5 bd9703fp/cp -v5/t/t-v5 bd9702cp-v5/t/t-v5 output current 1.5a 3.0a input voltage 8 or vo+3 36v switching frequency 100khz (fixed) 300khz (fixed) 110khz (fixed) external synchronization stand-by function operating temperature -40 +85 package to252-5/to220cp-v5/to220fp-5/to220f p-5 (v5) to220cp-v5/to220fp- 5/to220fp-5 (v5) apr.2008
2/14 absolute maximum ratings (ta25) parameter symbol ratings unit supply voltage (vcc-gnd) vcc 36 v stby-gnd v stby 36 v out-gnd v o 36 v inv-gnd v inv 10 v maximum switching current bd9701/bd9703 iout 1.5 a bd9702 3 power dissipation to252 pd 0.8 (*1) w to220 2(*2) operating temperature topr -40+85 storage temperature tstg -55+150 1 without external heat sink, the power dissipation reduces by 6 .4mw/ over 25. 2 without external heat sink, the power dissipation reduces by 1 6.0mw/ over 25. reduced by 160mw/, when mounted on infinity size heatsink. operating conditions(ta=-40+85) parameter symbol limit unit min typ max input voltage v cc 8.0 or vo+3 (*3) - 35.0 v output voltage vo 1.0 - 32 v 3 the minimum value of an input voltage is the higher either 8.0v or vo+3 electrical characteristics BD9701FP/cp-v5/t/t-v5 (unless otherwise noted, ta=25,vcc=12v, vo=5v,stby=3v) parameter symbol limit uni t conditions min typ max output on resistance ron - 1.0 1.5 design guarantee efficiency - 86 - io0.5a design guarantee switching frequency fosc 80 100 120 khz load regulation voload - 10 40 mv vcc=20v, io=0.51.5a line regulation voline - 40 100 mv vcc=1030v, io=1.0a over current protection limit iocp 1.6 - - a inv pin threshold voltage vinv 0.98 1.00 1.02 v inv pin threshold voltage thermal variation vinv - 0.5 - tj=085 design guarantee inv pin input current iinv - 1 - a vinv=1.0v stby pin threshold voltage on v stbyon 2.0 - 36 v off v stbyoff -0.3 - 0.3 v stby pin input current istby 5 25 50 a stby=3v circuit current icc - 4 12 ma stand-by current ist - 0 5 a stby0v
3/14 this product is not designed to be resistant to radiation. electrical characteristics bd9703fp/cp-v5/t/t-v5 (unless otherwise noted, ta=25,vcc=12v, vo=5v,stby=3v) parameter symbol limit uni t conditions min typ max output on resistance ron - 1.0 1.5 design guarantee efficiency - 86 - io0.5a design guarantee switching frequency fosc 270 300 330 khz load regulation voload - 10 40 mv vcc=20v, io=0.51.5a line regulation voline - 40 100 mv vcc=1030v, io=1.0a over current protection limit iocp 1.6 - - a inv pin threshold voltage vinv 0.98 1.00 1.02 v inv pin threshold voltage thermal variation vinv - 0.5 - tj=085 design guarantee inv pin input current iinv - 1 - a vinv=1.0v stby pin threshold voltage on vstbyon 2.0 - 36 v off vstbyoff -0.3 - 0.3 v stby pin input current istby 5 25 50 a stby=3v circuit current icc - 5 12 ma stand-by current ist - 0 5 a stby0v electrical characteristics bd9702fp/cp-v5/t/t-v5 (unless otherwise noted, ta=25,vcc=12v, vo=5v,stby=3v) parameter symbol limit uni t conditions min typ max output on resistance ron - 0.5 1.5 design guarantee efficiency - 86 - io1a design guarantee switching frequency fosc 88 110 132 khz load regulation voload - 10 40 mv vcc=20v, io=13a line regulation voline - 40 100 mv vcc=1030v, io=1.0a over current protection limit iocp 3.2 - - a inv pin threshold voltage vinv 0.98 1.00 1.02 v inv pin threshold voltage thermal variation vinv - 0.5 - tj=085 design guarantee inv pin input current iinv - 1 - a vinv=1.0v stby pin threshold voltage on vstbyon 2.0 - 36 v off vstbyoff -0.3 - 0.3 v stby pin input current istby 5 25 50 a stby=3v circuit current icc - 4 12 ma stand-by current ist - 0 5 a stby0v
4/14 40 50 60 70 80 90 100 10 100 1000 output current : iout[a] efficiency : [%] 0 0.5 1 1.5 2 2.5 3 3.5 00.511.52 switching current : isw[a] output voltage : vds[v] 0.980 0.990 1.000 1.010 1.020 -10 10 30 50 70 90 ambient temperature : ta [] inv threshold voltage : vinv[v] characteristic data BD9701FP/cp-v5/t/t-v5 0 1 2 3 4 5 6 01234 output current iout : [a] output voltage : vo [v] 90 95 100 105 110 -101030507090 ambient temperature : ta [] osc frequency : fosc[hz] 4.9 4.95 5 5.05 5.1 0 200 400 600 800 1000 output current : iout[a] output voltage : vo [v] 4.900 4.950 5.000 5.050 5.100 0 10203040 input voltage : vcc [v] output voltage : vo [v] vcc=30 v vcc=20 v vcc=10 v 90 95 100 105 110 0 10203040 input voltage : vcc [v] osc frequency : fosc[hz] 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 10 15 20 25 30 35 input voltage : vcc [v] circuit current ; [ma] fig.1 efficiencyload current fig.2 ocp vcc=20v fig.3 foscta fig.4 output voltageload current fig.5 output voltageinput voltage (vo=5v,ro=5ohm) fig.6 circuit currentinput voltage no load fig.7 voutout voltagedrain current fig.8 foscinput voltage fig.9 inv threshold voltageta
5/14 40 50 60 70 80 90 100 10 100 1000 10000 output current : iout[a] efficiency : [%] 0 1 2 3 4 5 6 0123456 output current : iout[a] output voltage : vo [v] 100 105 110 115 120 -10 10 30 50 70 90 ambient temperature : ta [] osc frequency : fosc[hz] 4.90 4.95 5.00 5.05 5.10 0 500 1000 1500 2000 2500 3000 output current : iout[a] output voltage : vo [v] vcc=10v vcc=20v vcc=30v 4.90 4.95 5.00 5.05 5.10 010203040 input voltage : vcc [v] output voltage : vo [v] 0 1 2 3 4 5 10 15 20 25 30 35 input voltage : vcc [v] circuit current ; [ma] 0.0 0.5 1.0 1.5 2.0 0 0.5 1 1.5 2 2.5 3 switching current : isw[a] output voltage : vds[v] 100 105 110 115 120 0 10203040 input voltage : vcc [v] osc frequency : fosc[hz] 0.98 0.99 1.00 1.01 1.02 -10 10 30 50 70 90 ambient temperature : ta [] inv threshold voltage : vinv[v] characteristic data bd9702fp/cp-v5/t/t-v5 fig.10 efficiencyload current fig.11 ocp vcc=20v fig.12 foscta fig.13 output voltageload current fig.14 output voltageinput voltage (vo=5v,ro=5ohm) fig.15 circuit currentinput voltage no load fig.16 voutout voltagedrain current fig.17 foscinput voltage fig.18 inv threshold voltageta
6/14 characteristic data bd9703fp/cp-v5/t/t-v5 40 50 60 70 80 90 100 10 100 1000 output current : iout[a] efficiency : [%] 0 1 2 3 4 5 6 01234 output current : iout[a] output voltage : vo [v] 270 285 300 315 330 -10 10 30 50 70 90 ambient temperature : ta [] osc frequency : fosc[hz] 4.9 4.95 5 5.05 5.1 0 200 400 600 800 1000 output current : iout[a] output voltage : vo [v] vcc=30v vcc=20v vcc=10v 4.90 4.95 5.00 5.05 5.10 0 10203040 input voltage : vcc [v] output voltage : vo [v] 0 1 2 3 4 5 10 15 20 25 30 35 input voltage : vcc [v] circuit current ; [ma] 0 0.5 1 1.5 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 switching current : isw[a] output voltage : vds[v] 270 285 300 315 330 0 10203040 input voltage : vcc [v] osc frequency : fosc[hz] 0.98 0.99 1.00 1.01 1.02 -10 10 30 50 70 90 ambient temperature : ta [] inv threshold voltage : vinv[v] fig.19 efficiencyload current fig.20 ocp vcc=20v fig.21 foscta fig.22 output voltageload current fig.23 output voltageinput voltage (vo=5v,ro=5ohm) fig.24 circuit currentinput voltage no load fig.25 voutout voltagedrain current fig.26 foscinput voltage fig.27 inv threshold voltageta
7/14 block diagram BD9701FP/cp-v5/t/t-v5, bd9703fp/cp -v5/t-v5, bd9702cp-v5/t/t-v5 pin description (*2)fin is assigned i n the case of to252-5. pin no. pin name function 1 vcc input power supply pin 2 out internal pch fet drain pin 3,fin(*2) gnd ground 4 inv output voltage feedback pin 5 stby on/off control pin vref osc 1 2 driver pwm comp ctl logic tsd error amp 4 inv out gnd stby 5 vcc ocp stby 3 to252-5 package dimension s (mm) to220fp-5 package dimension s (mm) to220fp-5(v5) package dimension s (mm) to220cp-v5 package dimension s (mm) fig.28 block diagram
8/14 block function explanations ? vref generates the regulated voltage from vcc input, compensated for temperature. ? osc g enerates the triangular wave osc illation frequency using an int ernal resistors and capacitor. u sed for pwm comparator input. ? error amp this block, via the inv pin, detects the resistor-divided o utput voltage, compares this with the reference voltage, then a mplifies and outputs the difference. ? pwm comp outputs pwm signals to the driver block, which converts t he error amp output voltage to pwm form. ? driver this push-pull fet driver powers the internal pch mosfet, which accepts direct pwm input. ? stby controls on/off operation via the stby pin. the output is o n when stby is high. ? thermal shutdown (tsd) this circuit protects the ic against thermal runaway and da mage due to excessive heat. a thermal sensor detects the juncti on temperature and switches the output off once the temperature ex ceeds a threshold value (175deg). hysteresis is built in (15deg ) in order to prevent malfunctions due to temperature fluctuation s. ? over current protection (ocp) the ocp circuit detects the voltage difference between vcc and out by measuring the current through the internal pch mosfet and switches the output off once the voltage reaches the threshold value. the ocp block is a self-recovery type (not latch). timing chart error amp output outpin osc (internal oscillation wave) output vcc pin voltage wave voltage wave voltage wave fig.29 timing chart
9/14 notes for pcb layout ? place capacitors between vcc and ground, and the schottky dio de as close as possible to the ic to reduce noise and maximize efficiency. ? connect resistors between inv and ground, and the output capa citor filter at the same ground potential in order to stabilize the output voltage. application component selection and settings inductor l1 if the winding resistance of the choke coil is too high, the ef ficiency may deteriorate. as the overcurrent protection operates over minimum 1.6a (BD9701FP/cp-v5/t/t-v5, bd9703fp/cp-v5/t-v5) or 3.2a minimum (bd9701cp-v5/t/t-v5), attention must be paid to the hea ting of the inductor due to ov erload of short-circulated load. note that the current rating for the coil should be higher than i out (max)Sil . iout (max): maximum load current if you flow more than maximum current rating, coil will become overload, and cause magnetic saturation, and those account for efficiency deterioration. select from enough current rating of coil which doesnt over peak current. l1:inductor value, vcc:maximum input voltage, vout:output volta ge, Sil:coil ripple current value, fosc:oscillation frequency shottky barrier diodes d1 a schottky diode with extremely l ow forward voltage should be u sed. selection should be based on the following guidelines regarding maximum forward current , reverse voltage, and power d issipation: ?the maximum current rating is h igher than the combined maximum load current and coil ripple current (Si l ). ?the reverse voltage rating i s higher than the vin value. ?power dissipation for the select ed diode must be within the ra ted level. the power dissipation of the diod e is expressed by the followin g formula: pdi=iout(max)vf(1-vout/vcc) iout (max): maximum load current , vf: forward voltage, vout: o utput voltage, vcc: input voltage capacitor c1,c2,c3,c4,c5 as large ripple currents flow across c1 and c3 capacitors, high frequency and low impedance capacitor for a switching regulator must be used. the ceramic capacitor c2 must be connec ted. if not, noise may cause an abnormal operation. if the ripple voltage of input and output is large, c4 selected among ceramic , tantalum and os capacitor with low esr may decrease the ripple, however if the only l ow esr capacitor is used, an o scillation or unstable operation may be caused. c5 is the capacitor for phase compensation and normally not use d. if you need to improve the stability of feedback network, connect c5 between inv and output. Sil = l1 (vccvout) vout vcc f osc 1 4 5 2 3 1 inv stby r2 : 1ko r1 : 4ko c5 vcc out gnd c2 5.0v l1 d1 c3 c4 c1 fig.30 layout
10/14 feed back resistance r1,r2 the offset of output voltage is determined by both feed back re sistance and inv pi n input current. vout=(r1+r2) vinv/r2 (vinv pin threshold votage) if feed back resistance is high, the setting of output voltage will be move. recommended : resistance betw een inv pin and gnd = less than 10k. recommended circuit (BD9701FP/cp-v5/t/t-v5) recommended components (example) inductor l110h :cdrh127/ld (sumida) schottky diode d1 :rb050la-40 (rohm) capacitor c1100f(50v) :al electric capacitor uhd1h101mpt (nic hicon) c2open c3220f(25v) :al electric capacitor uhd1e221mpt (nichicon) c4open c5open recommended components example 2 inductor l1100h :cdrh127/ld (sumida) schotky diode d1 :rb050la-40 (rohm) capacitor c1220f(25v) :al electric capacitor uvr1h221mp a (nichicon) c21.0f(50v) :ceramic cap umk212f105zg (taiyo yuden) c3470f(16v) :al electric capacitor uvr1e471mpa (nichicon) c4150f(20v) :os capacitor 20svp150m (sanyo) c3open + + 5 3 4 2 1 vcc stby gnd inv out 5.0v c5 r1 : 4k r2 : 1k c3 c4 d1 l1 c1 c2 fig.31 recommended circuit output voltage 5v : application cicuit example
11/14 (bd9703fp/cp-v5/t/t-v5) recommended components inductor l147h :cdrh127/ld (sumida) schotky diode d1 :rb050la-40 (rohm) capacitor c1100f(50v) :al electric capacitor uhd1h101mp t (nichicon) c22.2f(50v) :ceramic cap cm43x7r225k50a (kyocera) c3470f(25v) :al electric capacitor uhd1e471mpt (nichicon) c4open c3open (bd9702cp-v5/t/t-v5) recommended components inductor l147h :cdrh127/ld (sumida) schotky diode d1 :rb050la-40 (rohm) capacitor c11000f(50v) :al electric capacitor uhd1h102m pt (nichicon) c2open c31000f(25v) :al electric capacitor uhd1e102mpt (nichicon) c4open c3open test circuit i inv icc vcc out gnd inv stby vcc sw4 sw5 sw2 1 2 3 4 5 a vo f 1k a a v 2k v inv istb vstb sw6 + + io fig.32 input output measurement circuit
12/14 i/o equivalent circuit pin 1 (vcc), pin 3 (gnd) pin 2 (o ut) pin 4 (inv) pin 5 (stby) operation notes 1. absolute maximum ratings use of the ic in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in i c deterioration or damage. assumptions should not be made regardi ng the state of the ic (short mode or open mode) when such dama ge is suffered. a physical safety measure such as a fuse should be im plemented when use of the ic in a special mode where the absolu te maximum ratings may be exceeded is anticipated. 2. gnd voltage ensure a minimum gnd pin potential in all operating conditions. in addition, ensure that no pins other than the gnd pin carry a voltage lower than or equal to the gnd pi n, including during actual tra nsient phenomena. 3. thermal design use a thermal design that allows for a sufficient margin in lig ht of the power dissipation (pd) i n actual operating conditions . 4. inter-pin shorts and mounting errors use caution when orienting and positioning the ic for mounting on printed circuit boards. improper mounting may result in dama ge to the ic. shorts between output pins or between output pins and the p ower supply and gnd pin caused by the presence of a foreign obj ect may result in damage to the ic. 5. operation in strong electromagnetic field operation in a strong electroma gnetic field may cause malfuncti on. 6. thermal shutdown cir cuit (tsd circuit) this ic incorporates a built-in thermal shutdown circuit (tsd c ircuit). the tsd circuit is designed only to shut the ic off to prevent runaway thermal operation. do not continue to use the ic after operating this circuit or use the ic in an environment where th e operation of the thermal s hutdown circuit is assumed. 7 . testing on application boards vcc gnd out vcc inv vcc 300 stb vcc 70k 60k 140 k fig.33 input output equivalent circuit
13/14 output pin vcc back current prevention diode bypass diode when testing the ic on an application board, connecting a capac itor to a pin with low impedance subjects the ic to stress. always discharge capacitors after each process or step. ground the ic during assembly steps as an antistatic measure, and use similar caution when transporting or stor ing the ic. always tur n the ic's power supply off befo re connecting it to or removing it from a jig or fixture duri ng the inspection process. 8. ic pin input this ic is a monolithic ic which (as below) has p+ substrate an d betweenthe various pin. a p-n junction is formed from this p layer of each pin. for example the relati on between each potential is as follows. (when gnd > pinb and gnd > pina, the p-n junction ope rates as a parasitic diode.) parasitic diodes can occur inevitably in th e structure of the ic. the operation of parasitic diodes can re sult in mutual interference among circuits as well as operation faults and phy sical damage. accordingly, you must not use methods by which pa rasitic diodes operate, such as applying a voltage that is lower than t he gnd(p substrate)voltage to an input pin. 9 . common impedance power supply and ground wiring sh ould reflect consideration of the need to lower common impeda nce and minimize ripple as much as possible (by making wirin g as short and thick as possib le or rejecting ripple by i ncorporating inductance and capacitance). 10 . pin short and mistake fitting do not short-circuit between out pin and vcc pin, out pin and g nd pin, or vcc pin and gnd pin. when sold ering the ic on circuit board, please be unusually cautious abou t theorientation and the posit ion of the ic. 11. application circuit substrate parasitic diode gnd resistance parasitic diode transistor (npn) substrate gnd other adjacent components parasitic diode gnd parasitic diode (pinb) (pina) (pinb) (pina) fig.34 simplified structure of a bipolar ic fig.35
14/14 although we can recommend the app lication circuits contained he rein with a relatively high de gree of confidence, we ask that y ou verify all characteristics and specifica tions of the circuit as well a s performance under actual conditions. please note that we cann ot be held responsible for problems that m ay arise due to patent infringem ents or noncompliance with any and all applicable laws and regu lations. 12. operation the ic will turn on when the volt age at the stby pin is greater than 2.0v and will switch off if under 0.3v. therefore, do not input voltages between 0.3v and 2.0v. malfunctions and/or physical da mage may occur. power dissipation to252-s to220 (1) no heat sink (2) 2layer pcb (copper laminate area 15 mm15mm) (3) 2layer pcb (copper laminate area 70 mm70mm) (4) 4layer pcb (copper laminate area 70 mm70mm) (1) no heat sink (2) aluminum heat sink 50502 (mm 3 ) (3) aluminum heat sink 1001002 (mm 3 ) 0 2 5 3 0 25 50 75 100 125 150 (1) 0.80w (2) 1.85w ambient temperature : ta[c] 1 4 85 (3) 3.50w (4) 4.80w power dissipation : pd [w] fig.36 fig.37 ambient temperature : ta[c] 0 5 10 15 0 25 50 75 100 125 150 (3) 11.0w (2) 6.5w (1) 2.0w power dissipation : pd [w]
notes no technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of rohm co.,ltd. the contents described herein are subject to change without notice. the specifications for the product described in this document are for reference only. upon actual use, therefore, please request that specifications to be separately delivered. application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. rohm co.,ltd. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by rohm co., ltd. is granted to any such buyer. products listed in this document are no antiradiation design. appendix1-rev2.0 thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact your nearest sales office. rohm customer support system the americas / europe / asia / japan contact us : webmaster@ rohm.co. jp www.rohm.com copyright ? 2008 rohm co.,ltd. the products listed in this document are designed to be used with ordinary electronic equipment or de vices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. it is our top priority to supply products with the utmost quality and reliability. however, there is always a chance of failure due to unexpected factors. therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. rohm cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the notes specified in this catalog. 21 saiin mizosaki- cho, ukyo-ku, kyoto 615-8585, japan tel : +81-75-311-2121 fax : +81-75-315-0172 appendix

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