LED Drivers for LCD Backlights White Backlight LED Drivers for Small to Medium LCD Panels (Switching Regulator Type) No.11040ECT19 BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN Description Switching Regulator type LED Driver Series for small LCD backlight are boost DC/DC converters possible to drive the white LEDs at constant. It is possible that turning on white LED steadily by a series connection which has no current variation, and by a fast transient response with current mode. And, BD6069GUT/BD6071HFN/BD6072HFN are white LED driver ICs with synchronous rectification. With synchronous rectification (no external schottky diode required) and small package, they can save mount space. BD6071HFN suited over voltage and over current limit from BD6069GUT/BD6072HFN. Features 1) Boost DC/DC converter 2) Adjustment of brightness by external PWM pulse 3) Possible to driving 3 LEDs (BD6071HFN ) 4) Possible to driving 4 LEDs (BD6069GUT, BD6072HFN) 5) Possible to driving 8 LEDs (BD6067GU) 6) Soft start function (BD6067GU, BD6069GUT, BD6071HFN, BD6072HFN) 7) Synchronous rectification Boost DC/DC converter (BD6069GUT, BD6071HFN, BD6072HFN) 8) No external schottky diode required (BD6069GUT, BD6071HFN, BD6072HFN) 9) Output Open Short protect (BD6069GUT, BD6071HFN, BD6072HFN) Applications These drivers are applicable for various fields such as mobile phones, portable game machines, Inter-phone camera, audio player, portable DVD player, back light for printer display etc and support light of the camera for the mobile phone, simple flash. And, these can use power supply for OEL. Line up matrix Input Switching White LED Operating Parameter Package voltage range frequency number temperature range BD6067GU 2.7 ~ 5.5V 0.8 ~ 1.2MHz 5 ~ 8 -30 ~ +85 VCSP85H1 BD6069GUT 2.7 ~ 5.5V 0.8 ~ 1.2MHz 4 -30 ~ +85 VCSP60N1 BD6071HFN 2.7 ~ 5.5V 0.8 ~ 1.2MHz 3 -30 ~ +85 HSON8 BD6072HFN 2.7 ~ 5.5V 0.8 ~ 1.2MHz 4 -30 ~ +85 HSON8 www.rohm.com 1/29 2011.01 - Rev.C 2011 ROHM Co., Ltd. All rights reserved. BD6067GU, BD6069GUT , BD6071HFN, BD6072HFN Technical Note BD6067GU Absolute maximum ratings (Ta=25) Parameter Symbol Ratings Unit Conditions Applicable to Vin, EN, *1 Power supply voltage 1 VMAX1 7 V Vfb and VDAC pins *1 Power supply voltage 2 VMAX2 40 V Applicable to SW and Vout pins Operating temperature range Topr -30 ~ +85 Storage temperature range Tstg -55 ~ +150 *2 50mm58mm1.75mm Power dissipation Pd 800 mW Glass epoxy PCB mounting *1 This value is based on GND. *2 This loss decreases approximate 6.4mW/ when Ta is 25 or more. Recommended Operation Range (Ta=-30 to +85) Parameter Symbol Ratings Unit Conditions Operating supply voltage VCC 2.7 ~ 5.5 V Vin pin Electrical characteristics (Unless otherwise stated, Ta is 25 and Vin is 3.6V.) Limits Parameter Symbol Unit Conditions Min. Min. Min. <EN pin> L level input voltage VthL - - 0.4 V H level input voltage VthH 1.4 - - V H level input current IIH - 18.3 30.0 A EN=5.5V L level input current IIL -2.0 -0.1 - A EN=0V <DAC control pin> VDAC-Vfb resistance V 56 112 168 k DAR <Switching regulator> Input voltage range Vin 3.1 - 5.5 V Quiescent current Iq - 0.1 2.0 A EN=0V Operating current Idd - 0.9 1.4 mA EN=3.6V, Vfb=1.0V VFB pin control voltage Vfb 0.18 0.20 0.22 V *1 Over current limit Icoil 450 600 750 mA SW transistor ON resistance Ronn - 0.5 1.4 Isw=200mA Switching frequency fSW 0.8 1.0 1.2 MHz Maximum duty Duty 92.5 95.0 - % Vfb=0V Output voltage range Vo - - 30.0 V Over voltage protection Ovp 30.0 31.0 32.0 V Vfb=0V Output open protection Ovl - 0.7 1.4 V Startup time Ts - 0.5 1.0 ms Vout=24V *1 The DC current is measured in this item. www.rohm.com 2/29 2011.01 - Rev.C 2011 ROHM Co., Ltd. All rights reserved.