Power Supply IC Series for TFT-LCD Panels 12V Input Multi-channel System Power Supply IC BD8160AEFV No.09035EBT01 Description The BD8160AEFV is a system power supply for the TFT-LCD panels used for liquid crystal TVs. Incorporates two high-power FETs with low on resistance for large currents that employ high-power packages, thus driving large current loads while suppressing the generation of heat. A charge pump controller is incorporated as well, thus greatly reducing the number of application components. Features 1) Step-up and step-down DC/DC converter 2) Incorporates 2.6 A N-channel FET. 3) Incorporates positive/negative charge pumps. 4) Input voltage limit: 8 V to 18 V 5) Feedback voltage: 1.162 V 1% 6) Switching frequency: 500 kHz / 750kHz 7) Protection circuit: Under voltage lockout protection circuit Thermal shutdown circuit Overcurrent protection circuit Short Circuit Protection Overvoltage protection circuit for VS voltage (Boost DC/DC output) 8) HTSSOP-B28 Package Applications Power supply for the TFT-LCD panels used for LCD TVs Absolute maximum ratings (Ta = 25C) Parameter Symbol Rating Unit Supply Voltage SUP,VIN 20 V Power Dissipation Pd 4700* mW Operating Temperature Range Topr -40+85 Storage Temperature Range Tstg -55+150 Junction Temperature Tjmax 150 SW Voltage VSW 21 V SWB Voltage VSWB 19 V EN1,EN2 Voltage VEN1,VEN2 19 V * Derating in done 37.6mW/ for operating above Ta25(On 4-layer 70.0mm70.0mm1.6mm board) Recommendable Operation Range (Ta=25) Limits Parameter Symbol Unit Min Typ Max Supply Voltage SUP,VIN 8 12 18 V VS Voltage VS VIN+2 15 18 V Switch current for SW ISW 2.6** A Switch current for SWB ISWB 2.0** A EN1,EN2,FREQ Voltage VEN1,VEN2,VFREQ 18 V ** Pd, ASO should not be exceeded www.rohm.com 1/18 2009.07 - Rev.B 2009 ROHM Co., Ltd. All rights reserved. BD8160AEFV Technical Note Electrical characteristics (unless otherwise specified VIN=12V and Ta=25C) 1. DC/DC converter controller block Limits Parameter Symbol Unit Conditions Min Typ Max Soft start SS SS source current I 6 10 14 A V =0.5V SO SS Error amplifier block FB and FBB FB and FBB input bias current I - 0.1 2 A FB12 Feedback voltage for boost converter V 1.150 1.162 1.174 V Voltage follower FB Feedback voltage for buck converter V 1.188 1.213 1.238 V FBB SW block SW On resistance N-channel R - 0.2 0.3 I =0.8A ONN O Leak current N-channel I - 0 10 A V =18V LEAKN1 SW Switch current limit for SW I 2.6 - - A SW Maximum duty cycle M 75 90 97 % FB= 0V DUTY SW block SWB On resistance N-channel R - 0.2 0.3 I =0.8A ONH O Leak current N-channel I - 0 10 A V =18V , V =0V LEAKN2 INB SWB Switch current limit for SWB I 2.0 - - A SWB Protections Over Voltage Protection for SW V 18.5 19 19.5 V SWOVP 2. Charge pump driver block Limits Parameter Symbol Unit Conditions Min Typ Max Error amplifier block FBP and FBN FBP, FBN input bias current I I - 0.1 1 A FBP, FBN Feedback voltage for VGH V 1.188 1.213 1.238 V FBP Feedback voltage for VGL V 0.18 0.2 0.22 V FBN Delay start block DLY1, DLY2 source current I I 2 5 9 A V =0.5V DLY1, DLY2 DLY DRP, DRN block On resistance N-channel R - 5 - I =20mA ONN O On resistance P-channel R - 3 - I =20mA ONP O www.rohm.com 2/18 2009.07 - Rev.B 2009 ROHM Co., Ltd. All rights reserved.