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1/15 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. system power supply for tv series built-in 1ch fet light load type dc / dc converters BD8622EFV description BD8622EFV has realized the high performance and reliability required as a power supply for thin-screen tv. due to the high-speed load response, it is most suitable fo r tv-purpose processors with increasingly high performance, and due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application design. as a high-reliability design, it has various built-in protecti on circuits (overcurrent protection, output voltage abnormal protection, thermal protection, and off-latc h function at the time of abnormality etc. ), therefore as an advantage it does not easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for thin-screen tv which requires the high reliability. features 1) high efficiency in all load area 2) 3.0a output current 3) pwm mode/pfm mode switch( automatic operation) 4) low current mode/rorripplmord switch with terminal mode 5) low rds(on) internal switches:75m ? (typ.) 6) 1% reference voltage accuracy 7) programmable frequency : 250khz-1mhz (can the adjustment by an external synchr onization and the terminal rt resistance.) 8) terminal rt open/short detecting function 9) over current protection function 10) output over voltage/low voltage pr otection function (over : fb > vref +60mv , low : fb < vref -60mv) 11) timer off latch function in abnormal circumstances 12) thermal shutdown function 13) under voltage protection 14) soft start/start delay circuit 15) soft start time out function 16) protecting bus function with terminal pdet 17) htssop-b20 package no.09034eat04
technical note 2/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. electrical characteristics (unless otherwise noted ta=25 ? ? ?
technical note 3/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. block diagram 2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1 1 2 3 4 5 6 7 8 9 s g n d r t f c p d e t f b n c e n s w p g n d 10 s v i n v i n v i n v i n s w s w s w n c n c m o d e s s / d e l a y predrive detect abnormal voltage and start error o s c e n 0.8v err amp shut down pwm/pfm control e n a b l e v i n s v i n fig1 block diagram pin description no. symbol description explanation 1 sgnd signal gnd terminal small signal system gnd 2 fb feed back terminal output voltage detection 3 pdet abnormal state notification and external ic abnormality detection terminal protecting bus communication terminal 4 nc 5 sw switching output terminal 6 sw 7 sw 8 sw 9 nc 10 pgnd power gnd terminal gnd for power mosfet 11 vin power supply input terminal power suppl y input. the decoupling is done to pgnd 12 vin 13 vin 14 vin 15 nc 16 en enable input on/off control for device operation 17 mode mode selection terminal the operation mode is switched according to the input voltage at a light load. 18 ss/delay soft start adjustment capacity connection terminal the so ft start time is adjusted with the connected capacitor 19 fc error amplifier output error amplifier phase compensation point 20 rt frequency adjustment resistance connection terminal the switching frequency is set by the connected resistance
technical note 4/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. pin equivalence circuit diagram no. symbol explanation terminal equivalent circuit diagram 1 sgnd gnd (connected 0v) 2 fb output voltage detection terminal 3 pdet protecting bus i/o terminal 5,6,7,8 sw output terminal 10 pgnd power gnd (same voltage as sgnd) 11,12,13 pvin power supply input terminal 14 svin power supply input terminal
technical note 5/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. no. symbol explanation terminal equivalent circuit diagram 16 en enable terminal 17 mode operation mode switch terminal at light load
technical note 6/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. no. symbol explanation terminal equivalent circuit diagram 18 ss /delay soft start time adjustment terminal 19 fc error amplifier compensation terminal 20 rt oscillator frequency adjustment terminal
technical note 7/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. operation description enable control the device can be controlled on/off by en terminal (16 pin) voltage. an internal circuit starts when ven reaches 1.1v. when standing up of vin is too steep (1msec or less), a defective start might be caused according to the state of pascon between gnd substrate pattern and power supply-when the terminal en is short-circuited to the terminal vin and it is used. v en 0 v ss 0 v ssclm v ssth v o 0 t ss v enh v enl en terminal ss terminal output setting voltage fig.2 on/off transition wave form in en controlling
technical note 8/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. soft start time set function as for BD8622EFV, output can do soft start without overshoot by charging soft start capacity (css) connected between ss and sgnd terminal. also, soft start time (tss) can be set by se tting soft start capacity (css) arbitrarily. osc oscillation fre quency setting function the output oscillation frequency can be set by connecting resistance between terminal rt (20 pins) and sgnd (range = 250khz - 1mhz) the relation between rt terminal resistance and the oscillation frequency follows fig.4. 10 1000 10 100 1000 10000 frequency [khz] rt terminal resistance [k ? ] fig.4 rt resistance-oscillation frequency frequency [khz]
technical note 9/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. light load mode operation ? low current mode when the terminal mode (17 pins) is made "h", low current m ode operation becomes effective. the characteristic of the efficiency valuing is obtained in low current mode operation at a light load. fig.5 low current mode operation ? low ripple mode when the terminal mode is made "l", the low ripple mode operat ion becomes effective. it becomes operation of valuing a low ripple in the low ripple mode operation at a light load. fig.6 low ripplemord operation fig7 light load mode efficiency comparison 0 10 20 30 40 50 60 70 80 90 100 1 10 100 vin=3.3v vo=1.8v io=0 100ma sw_f=550khz(r11=220k ? ) low ripple mord low current mode efficiency [%] negative overcurrent [ma] v out [20mv/div] sw [2v/div] i l [200ma/div] vout [20mv/div] sw [2v/div] il [200ma/div]
technical note 10/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. protection function protection circuit is effective for destruction prevention due to accident so that avoid usin g under continuous protection operation. low voltage protection function (lvp) the voltage of the terminal fb (2 pins) is compared with internal reference voltage vref. if fb terminal voltage falls below v lvp (= vref -60mv) and the state continues fo r 500us, output changes to low voltage and the state is fixed. in that case , pdet (3pin) output changes to l. table 1 output low voltage protection function en terminal ss terminal fb terminal low voltage protection function low voltage protection operation >v enh >1.4v(typ) v lvp off <1.4v(typ) - invalidity off v enh >1.4v(typ) >v ovp effective on technical note 11/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. under voltage lock out protection (uvlo) as for BD8622EFV, the power-supply voltage decr ease detection protection circuit is built in. it the input voltage decrease below the uvlo voltage (2.5v typ) , the device state changes to the standby mode (moreover, to prevent the chattering of the output) hy steresis width of 100mv(typ) has been in stalled in the uvlo cancel voltage. rt terminal open/short protection function (rto/rts) rt terminal opening/short protection function pr event the clock from abnormal oscillation. if rt terminal open/short protection function is detected, output voltage changes to low level and is fixed. terminal rt opening/short protection function is available if the state continue for 500us ec, abnormal detection operates when the state continues about 500 sec(typ). soft start time-out function if vss doesn't exceed vssth within 64msec (typ) since a so ft start began, BD8622EFV controls an off latch. vo is fixed in a low level. v ssth 0v ss terminal 64msec yp fig.9 soft start time-out thermal shut down function thermal shut down circuit (tsd circuit) is built into bd862 2efv. when the temperature of t he chip exceeds tjmax=175, the dc/dc converter is fixed in a low voltage. tsd function is aimed to shut down ic from thermal re ckless driving under an abnormal state to exceed tjmax=175. it aims at neither protection nor the guarantee of the set. therefore, please do not use this function to protect the set. over current protection function the over current protection function has been achieved by limiting the current that flows on high side mosfet. the current is controlled in every one cycle of the switching frequency. when an abnormal state continues for about 500 sec(typ), the output is fixed in a low level.
technical note 12/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. protecting bus function with terminal pdet the terminal pdet (3 pins) monitors whether ic is normal or not. when ic becomes abnormal, the pdet output is reduced at "l" level with the output voltage fixed ?l? level at the same ti me. moreover, it is possible to make the output fix in a low level by compulsorily reducing the terminal pdet at "l" level from the outside. when two or more BD8622EFV is used in the application, this function prevents the ic from destroying, because one ic error transmits all other ics by pdet line in the co ndition that pdet terminals are connected each other. pdet ic_a pdet vin ic_b vin 170k 170k fig.10 protecting bus communication please give the terminal pdet as open when you do not use protecting bus function. error detection (off latch) release method BD8622EFV enters the state of an off latc h when the protection function operates. to release the off latch state, en terminal vo ltage should be changed to low level once time.
technical note 13/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. each characteristic reference data fig.11 output load response fig.12 output ripple 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000 10000 efficiency ? [%] load ? current ? [ma] fig.13 efficiency fig.14 soft start 1.5 ? 1.6 ? 1.7 ? 1.8 ? 1.9 ? 2.0 ? 0.0 0.5 1.0 1.5 2.0 2.5 3.0 output ? voltage ? : ? vo ? [v] load ? current ? [a] fig.15 regulation vout : 100mv/div io = 1a/div vin = 5v io = 3a vout : 20mv/div 100usec/div 1usec/div vin = 2v/div vout = 0.5v/div ss = 2v/div vin = 5.0v vin = 3.3v vout = 1.8v fosc = 550khz lc mode 10msec/div vin = 5.0v vout = 1.8v
technical note 14/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. 0.790 ? 0.792 ? 0.794 ? 0.796 ? 0.798 ? 0.800 ? 0.802 ? 0.804 ? 0.806 ? 0.808 ? 0.810 ? -25 0 25 50 75 100 125 150 error ? amp ? reference ? voltage ? : ?? vref ? [v] ambient ? temperature ? : ? ta ? [ ] 3.0 ? 3.3 ? 3.5 ? 3.8 ? 4.0 ? 4.3 ? 4.5 ? 4.8 ? 5.0 ? -25 0 25 50 75 100 125 150 ss ? charge ? current ?? : ? iss ? [ a] ambient ? temperature ? : ? ta ? [ ] fig.16 reference voltage - temperature characteristic fig.17 ss charging current - temperature characteristic 500.0 ? 510.0 ? 520.0 ? 530.0 ? 540.0 ? 550.0 ? 560.0 ? 570.0 ? 580.0 ? 590.0 ? 600.0 ? 2.533.544.555.5 frequency ? : ? fosc ? [khz] input ? voltage ? : ? vin ? [v] 500.0 ? 510.0 ? 520.0 ? 530.0 ? 540.0 ? 550.0 ? 560.0 ? 570.0 ? 580.0 ? 590.0 ? 600.0 ? -25 0 25 50 75 100 125 150 frequency ? : ? fosc ? [khz] ambient ? temperature ? : ? ta ? [ ] fig.18 switching frequency-power-supply voltage fig.19 switching frequency-temperature characteristic 0.0 ? 10.0 ? 20.0 ? 30.0 ? 40.0 ? 50.0 ? 60.0 ? 70.0 ? 80.0 ? 90.0 ? 100.0 ? 2 . 533 . 544 . 555 . 5 on \ resistance: ? ron ? [m ] input ? voltage ? : ? vin ? [v] 30.00 ? 40.00 ? 50.00 ? 60.00 ? 70.00 ? 80.00 ? 90.00 ? 100.00 ? 110.00 ? -25 0 25 50 75 100 125 150 on \ resistance: ? ron ? [m ] ambient ? temperature ? : ? ta ? [ ] fig.20 pmos on resistance-power-supply voltage fig. 21 pmos on resistance-temperature characteristic 0.00 ? 0.10 ? 0.20 ? 0.30 ? 0.40 ? 0.50 ? 0.60 ? 0.70 ? 0.80 ? 0.90 ? 1.00 ? -25 0 25 50 75 100 125 150 en ? voltage ? high: ? v enh ? [v] ambient ? temperature ? : ? ta ? [ ] 0.0 ? 50.0 ? 100.0 ? 150.0 ? 200.0 ? 250.0 ? 300.0 ? 350.0 ? 400.0 ? 2.533.544.555.5 circuit ? current: ? icc ? [ua] input ? voltage ? : ? vin ? [v] fig.22 terminal en h voltage-temperature characteristic fi g.23 circuit current-power-suppl y voltage characteristic vin = 3.3v vin = 3.3v ta = 2 5 vin = 3.3v ta = 2 5 vin = 3.3v vin = 3.3v ta = 2 5 v fb = 0.83v v fc = 1.0v sw = h
technical note 15/15 BD8622EFV www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ordering part number b d 8 6 2 2 e f v - e 2 part no part no. package efv: htssop-b20 packaging and forming specification e2: embossed tape and reel ta p e quantit y direction of feed embossed carrier ta p e 2500 p cs e2 (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) unit:mm ) htssop-b20 1.0max. 10 1 20 11 0.17 1.0 0.2 0.5 0.15 0.65 s 0.08 +0.05 ?0.04 +0.05 ?0.03 0.2 6.4 0.2 0.85 0.05 0.08 0.05 4.4 0.1 0.325 6.5 0.1 s reel 1pin 1234 1234 1234 1234 1234 1234 1234 1234 when you order , please order in times the amount of package quantity. direction of feed
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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