Datasheet White LED Driver with Synchronous Boost Converter and PWM Brightness Control for up to 4 LEDs in Series BD6072HFN General Description Key Specifications BD6072HFN is boost DC/DC converter possible to Operating power supply voltage range: 2.7V to 5.5V boost output voltage up to 18V (Max.) and drive the Switching frequency: 1MHz(Typ.) white LEDs at constant. It is possible that turning on Quiescent Current: 0.1A (Typ.) white LED steadily by a series connection which has no Operating temperature range: -30C to +85C current variation, and by a fast transient response with current mode. And, BD6072HFN is white LED driver IC Package W(Typ.) x D(Typ.) x H(Max) with synchronous rectification. With synchronous rectification (no external schottky diode required) and small package, they can save mount space. Features Boost DC/DC converter Adjustment of brightness by external PWM pulse Possible to driving 4 LEDs Soft start function HSON8 Synchronous rectification Boost DC/DC converter 2.90mm x 3.00mm x 0.60mm No external schottky diode required Output Open Short protect Applications This driver is 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 Typical Application Circuit VIN Pin Configuration Top View L 22 H CIN 1 F VOUT VIN SW 8 76 5 COUT White LED 1 F BD6072HFN VFB RFB 24 1 2 3 4 GND GNDA EN TEST Figure 1. Pin configuration HSON8 (Top view) Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays www .rohm.com TSZ02201-0G3G0C200390-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/15 TSZ2211114001 12.OCT.2012 Rev.001DatasheetDatasheet BD6072HFN Absolute Maximum Ratings (Ta=25C) Parameter Symbol Ratings Unit Conditions 1 Terminal voltage 1 VMAX1 7 * V VIN,EN,VFB,TEST pins 1 Terminal voltage 2 VMAX2 20 * V SW,VOUT pins 2 70mm70mm1.6mm Power dissipation Pd 630 * mW At glass epoxy board mounting. Operating temperature range Topr -30 ~ +85 C Storage temperature range Tstg -55 ~ +150 C *1 These values are based on GND and GNDA pins. *2 When its used by more than Ta=25C, its reduced by 5.04mW/C. Recommended Operating Ratings (Ta=-30C to +85C) Ratings Parameter Symbol Unit Conditions Min. Typ. Max. Operating supply voltage VIN 2.7 3.6 5.5 V VIN pin Electrical Characteristics (Unless otherwise specified Ta = +25C, VIN=3.6V) Limits Parameter Symbol Unit Conditions Min. Typ. Max. <EN terminal> EN threshold voltage (Low) VthL - - 0.4 V EN threshold voltage (High) VthH 1.4 - - V EN terminal input current Iin - 18.3 30.0 A EN=5.5V EN terminal output current Iout -2.0 -0.1 - A EN=0V <Switching regulator> Quiescent Current Iq - 0.1 2.0 A EN=0V Current Consumption Idd - 1.1 1.5 mA EN=2.6V,VFB=1.0V,VIN=3.6V Feedback voltage VFB 0.47 0.50 0.53 V *1 Inductor current limit Icoil 270 350 430 mA VIN=3.6V SW saturation voltage Vsat - 0.14 0.28 V Isw=200mA, VOUT=13V SW on resistance P Ronp - 2.1 3.2 Ipch=200mA,VOUT=13V Switching frequency fSW 0.8 1.0 1.2 MHz Duty cycle limit Duty 82.7 85.0 - % VFB=0V Output voltage range Vo - - 18.0 V Over voltage limit Ovl 18.0 18.5 19.0 V VFB=0V Start up time Ts - 0.5 1.0 ms *1 This parameter is tested with dc measurement. www.rohm.com TSZ02201-0G3G0C200390-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/15 TSZ2211115001 12.OCT.2012 Rev.001