BD6581GU-E2

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 Symbol Ratings Unit Condition Maximum applied voltage 1 VMAX1 7 V TEST, VREG, SENSP, SENSN, SW, RSTB, PWMPOW, PWMDRV, FAILSEL, ISETH, ISETL Maximum applied voltage 2 VMAX2 25 V LED1, LED2, LED3, LED4, LED5, LED6, VBAT Maximum applied voltage 3 VMAX3 50.5 V VDET Power dissipation 1 Pd1 1100 mW *1 Operating temperature range Topr -30 ~ +85 ℃ - Storage temperature range Tstg -55 ~ +150 ℃ - Unit Condition (*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 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 2.7 12.0 Max. 22.0 1/26 V 2010.03 - Rev.A Technical Note BD6581GU ●Electrical Characteristic(Unless otherwise specified, VBAT=12V, RSTB=2.5V, Ta = +25 ℃) Limits Parameter Symbol Unit Min. Typ. Max. Condition [FAILSEL,PWMDRV 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 VBAT5.0V High Input Voltage range2 PWMH2 1.4 - VBAT V VBAT5.0V High Input Voltage range2 RSTBH2 2.25 2.5 VBAT V VBAT