LED Drivers for LED Backlights Backlight LED Driver for Small LCD Panels (Charge Pump Type) No.11040EAT24 BD1606MVV Description The multi-level brightness control white LED driver not only ensures efficient boost by automatically changing the boost rate but also works as a constant current driver in 64 steps, so that the driving current can be adjusted finely. This IC is best suited to turn on white LEDs that require high-accuracy LED brightness control. Features 1) A 6 parallel LED driver is mounted 2) 64-step LED current adjust function 3) Inter-LED relative current accuracy: 3% or less 2 4) LED individual lighting/dimming control via a I C BUS interface 5) Automatic transition charge pump type DC/DC converter (1,1.5 and 2) 6) High efficiency achieved (90% or more at maximum) 7) Various protection functions such as output voltage protection, overcurrent limiter and thermal shutdown circuit are mounted. 8) Small QFN package Applications This driver is applicable for various fields such as mobile phones, portable game machines and white goods. Absolute Maximum Rating (Ta=25) Parameter Symbol Limits Unit Power supply voltage VMAX 7 V Operating temperature range Topr -30 ~ +85 Storage temperature range Tstg -55 ~ +150 Power dissipation Pd 780 (*1) mW (*1) When a glass epoxy substrate (70mm 70mm 1.6mm) has been mounted, this loss will decrease 6.2mW/ if Ta is higher than or equal to 25. Recommended Operation Range (Ta=-30 to +85) Parameter Symbol Limits Unit Operating power supply voltage VCC 2.7~5.5 V www.rohm.com 2011.04 - Rev.A 1/11 2011 ROHM Co., Ltd. All rights reserved. BD1606MVV Technical Note Electrical Characteristics (Unless otherwise stated, Ta is 25 and Vin is 3.6V) Limits Parameter Symbol Unit Condition Min. Typ. Max. Input voltage range Vin 2.7 3.6 5.5 V Vin pin Quiescent current Iq - 0 7 A EN=0V, V =3.6V in Circuit current 1 IDD1 - 1.0 2.6 mA 1 mode, I =0mA, Vin =3,6V out Charge pump Output current IOUT - - 120 mA VOUT =4.0V, Vin=3.6V Oscillation frequency fOSC 0.8 1.0 1.2 MHz Add=0x03, D6=0 LED driver ILED =16.5mA(LEDxCNT=0x20), LED current absolute precision ILED-ERR - - 6.5 % LED pin voltage 1.0 V ILED =16.5mA(LEDxCNT=0x20) , 1) LED current relative precision ILED-to-LED - 0.5 3.75* % LED pin voltage 1.0V LED control voltage VLED - 0.2 0.25 V ILEDA*/B*/C* Logic interface Input L voltage VIL - - 0.4 V EN, SCL, SDA Input H voltage VIH 1.6 - - V EN, SCL, SDA Input H current IIH - - 10 A EN, SCL, SDA=Vin Input L current IIL -10 - - A EN, SCL, SDA=GND - - 0.4 V SDA, 3mA source L level SDA output VOL - - 0.6 V SDA, 6mA source 2 I C BUS interface (standard mode) SCL clock frequency fSCLC 0 - 100 kHz SCL Low duration tLOW 4.7 - - s SCL High duration tHIGH 4.0 - - s Data hold time tHD DAT 0 - 3.45 s Data setup time tSU DAT 250 - - ns Setup time restart condition tSU STA 4.7 - - s Hold time restart condition tHD STA 4.0 - - s Setup time stop condition tSU STO 4.0 - - s Bus free tine between start and stop tBUF 4.7 - - s 2 I C BUS interface (fast mode) SCL clock frequency fSCL 0 - 400 kHz SCL Low duration tLOW 1.3 - - s SCL High duration tHIGH 0.6 - - s Data hold time tHD DAT 0 - 0.9 s Data setup time tSU DAT 100 - - ns Setup time restart condition tSU STA 0.6 - - s Hold time restart condition tHD STA 0.6 - - s Setup time stop condition tSU STO 0.6 - - s Bus free time between start and stop tBUF 1.3 - - s Interface startup time TEN - - 350 s Bus startup time (after En=H) *1) The following expression is used for calculation: I = (Imax-Imin)/(Imax+Imin) 100 LED-match Imax= Current value in a channel with the maximum current value among all channels Imin=Current value in a channel with the minimum current value among all channels www.rohm.com 2011.04 - Rev.A 2/11 2011 ROHM Co., Ltd. All rights reserved.