BD6581GU

LED Drivers for LCD Backlights White Backlight LED Driver for Medium to Large LCD Panels (Switching Regulator Type) BD6581GU No.10040EAT13 ●Description BD6581GU is white LED driver IC with PWM step-up DC/DC converter that can boost max 42.5V and current driver that can drive max 25mA. The wide and precision brightness can be controlled by external PWM pulse. BD6581GU has very accurate current drivers, and it has few current errors between each strings. So, it will be helpful to reduce brightness spots on the LCD. Small package type is suited for saving space. ●Features 1) High efficiency PWM step-up DC/DC converter (fsw=1MHz), max efficiency 93% 2) High accuracy & good matching (±1.5%) current drivers 6ch 3) Drive up to 12＊ in series, 6 strings in parallel =72 white LEDs (＊white LED Vf=3.5Vmax) 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 6) Small & thin package (VCSP85H2) 2.6×2.6×0.85mm ●Absolute Maximum Ratings All middle size LCD equipments backlight of Notebook PC, portable DVD player, car navigation systems, etc. Parameter Maximum applied voltage 1 Maximum applied voltage 2 Maximum applied voltage 3 Power dissipation 1 Operating temperature range Storage temperature range Symbol VMAX1 VMAX2 VMAX3 Pd1 Topr Tstg Ratings 7 25 50.5 1100 -30 ~ +85 -55 ~ +150 Unit V V V mW ℃ ℃ Condition TEST, VREG, SENSP, SENSN, SW, RSTB, PWMPOW, PWMDRV, FAILSEL, ISETH, ISETL LED1, LED2, LED3, LED4, LED5, LED6, VBAT VDET *1 - - (*1) This value is the measurement value that was mounted on the PCB by ROHM. Temperature deleting: 8.8mW/ ℃ from Ta>25℃ ●Recommended Operating Range (Ta=-30℃ ~ +85℃) Limits Parameter Symbol Min. Typ. Power supply voltage VBAT 2.7 12.0 Max. 22.0 Unit V Condition www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 1/26 2010.03 - Rev.A BD6581GU ●Electrical Characteristic(Unless otherwise specified, VBAT=12V, RSTB=2.5V, Ta = +25 ℃) Limits Parameter Symbol Unit Min. Typ. Max. [FAILSEL,PWMDRV Terminal] EN threshold voltage (Low) EN threshold voltage (High) 1 EN threshold voltage (High) 2 EN terminal input current [PWMPOW Terminal] Low Input Voltage range High Input Voltage range1 High Input Voltage range2 PWM pull down resistor [RSTB Terminal] Low Input Voltage range High Input Voltage range1 High Input Voltage range2 Current Consumption [Regulator] VREG Voltage Under Voltage Lock Out [Switching Regulator] Quiescent Current 1 Quiescent Current 2 Current Consumption LED Control voltage Over Current Limit voltage SBD Open Protect Switching frequency Duty cycle limit Over voltage limit [Current driver] LED maximum current LED current accuracy LED current matching ISET voltage LED current limiter ILMAX ILACCU ILMAT Iset ILOCP 0.5 35 10.0 0.6 60 11.5 25 ±3 ±1.5 0.7 90 13.0 mA % % V mA V ILED=16mA Iq1 Iq2 Idd VLED Ocp Sop fSW Duty Ovl 0.4 70 0.8 92.5 43.0 0.6 4.6 3.4 0.5 100 1.0 95.0 44.7 3.4 10 5.1 0.6 130 0.1 1.2 99.0 46.4 µA µA mA V mV V MHz % V LED1-6=0.3V LED1-6=0.3V *1 VREG UVLO 4.0 2.05 5.0 2.25 6.0 2.65 V V No load RSTBL RSTBH1 RSTBH2 IRSTB 0 2.25 2.25 2.5 2.5 89 0.2 5.0 VBAT 134 V V V µA VBAT>5.0V VBAT5.0V VBAT5.0V VBAT