LED Drivers for LCD Backlights White Backlight LED Drivers for Medium to Large LCD Panels (Switching Regulator Type) No.11040EBT26 BD6066GU, BD6066EKN Description BD6066GU/BD6066EKN are white LED driver ICs with PWM step-up DC/DC converter that can boost max 40.5V and current driver that can drive max 30mA. The wide brightness can be adjusted to control by external PWM pulse on power control terminal. And, with extended resolution current driver, a few errors between the lines of the current driver, it is suitable for decreasing the lacking in brightness of the display. BD6066GU, CSP package type, is suited for saving space. BD6066EKN, HQFN package type, is suited for mounting on the flexible board. Features 1) High efficiency PWM step-up DC/DC converter (fsw=1MHz) 2) Extended resolution current driver 4ch 3) Driving 12 series 4parallel =48 white LEDs ( white LED Vf=3.2Vmax) 4) Wide input voltage range (2.7V ~ 22V) 5) Rich safety functions Over-voltage protection (OVP) Over current limit External SBD open detect Thermal shutdown (175 ) 6) CSP small & thin package VCSP85H2 2.6 2.6 0.85mm HQFN28V 5.2 5.2 0.95mm Applications Notebook PC, portable DVD player, car navigation systems Absolute maximum ratings (Ta=25 ) Parameter Symbol Limits Unit Condition TEST,ISET,VREG,SENSP, Maximum applied voltage 1 VMAX1 7 V SENSN, SW, EN1, EN2, PWM Maximum applied voltage 2 VMAX2 15.5 V LED1, LED2, LED3, LED4 Maximum applied voltage 3 VMAX3 30.5 V VBAT Maximum applied voltage 4 VMAX4 50.5 V VDET *1 Power dissipation 1 (BD6066GU) Pd1 1100 mW *2 Power dissipation 2 (BD6066EKN) Pd2 560 mW *3 Power dissipation 3 (BD6066EKN) Pd3 880 mW *4 Power dissipation 4 (BD6066EKN) Pd4 2650 mW Operating temperature range Topr -30 ~ +85 Storage temperature range Tstg -55 ~ +150 (*1) The measurement value which was mounted on the PCB by ROHM. When its used by more than Ta=25 , its reduced by 8.8mW/ . (*2) Reduced 4.5mW/ With Ta>25 when not mounted on a heat radiation Board. (*3) 70mm x 70mm x 1.6mm glass epoxy Board which has 1 layers (60mm x 60mm). When its used by more than Ta=25 , its reduced by 7.0mW/ . (*4) 70mm x 70mm x 1.6mm glass epoxy Board which has 2 layers (60mm x 60mm). When its used by more than Ta=25 , its reduced by 21.2mW/ . www.rohm.com 2011.06 - Rev.B 1/15 2011 ROHM Co., Ltd. All rights reserved. BD6066GU,BU6066EKN Technical Note Recommended operating range (Ta=-30 ~ +85 ) Limits Parameter Symbol Unit Condition Min. Typ. Max. BD6066GU Power supply voltage VBAT 2.7 12.0 22.0 V BD6066EKN Electrical characteristic (Unless otherwise specified, VBAT=12V, Ta = +25 ) Limits Parameter Symbol Unit Condition Min. Typ. Max. EN Terminal EN threshold voltage (Low) VthL 0 - 0.2 V EN threshold voltage (High) 1 VthH1 1.4 - 5.0 V VBAT > 5.0V EN threshold voltage (High) 2 VthH2 1.4 - VBAT V VBAT < 5.0V EN terminal input current Iin - 8.3 14.0 A EN=2.5V EN terminal output current Iout -2.0 -0.1 - A EN=0V PWM Terminal Low Input Voltage range PWML 0 - 0.2 V High Input Voltage range1 PWMH1 1.4 - 5.0 V VBAT > 5.0V High Input Voltage range2 PWMH2 1.4 - VBAT V VBAT < 5.0V PWM pull down resistor PWMR 300 500 700 k Regulator VREG Voltage VREG 4.0 5.0 6.0 V Under Voltage Lock Out UVLO 2.05 2.35 2.65 V Switching Regulator *1 Input voltage range Vin 3.1 12.0 22.0 V Quiescent Current 1 Iq1 - 0.6 3.4 A EN=0V, VBAT=12V Quiescent Current 2 Iq2 - 4.6 10 A EN=0V, VBAT=22V Current Consumption Idd - 3.4 5.1 mA EN=3.6V, VDET=0V,ISET=24k LED Control voltage VLED 0.4 0.5 0.6 V *2 Over Current Limit voltage Ocp 70 100 130 mV SBD Open Protect Sop - 0.2 1.4 V Switching frequency fSW 0.8 1.0 1.2 MHz Duty cycle limit Duty 92.5 95.0 99.0 % LED1=LED2=LED3=LED4=0V Over Voltage Limit Ovl 40.5 42.0 43.5 V LED1=LED2=LED3=LED4=0V Start up time Ts - 0.5 1.0 ms Output voltage=24V Current driver LED maximum current ILMAX - - 30 mA LED current accuracy ILACCU - - 5 % ILED=20mA - Each LED current / Average LED current matching ILMAT - - 3 % (LED1,2,3,4) - ILED=20mA ISET voltage Iset 0.5 0.6 0.7 V LED current limiter ILOCP 35 60 90 mA LED Terminal Over Voltage Protect LEDOVP 12.5 13.5 14.5 V *1 Electrical characteristics are guaranteed from 3.1V to 22V and operating is guaranteed from 2.7V to 3.1V. *2 This parameter is tested with dc measurement. www.rohm.com 2011.06 - Rev.B 2/15 2011 ROHM Co., Ltd. All rights reserved.