LED Drivers for LCD Backlights Backlight LED Drivers for Small LCD Panels (Charge Pump Type) No.11040EBT23 BD1604MUV, BD1604MVV Description This LSI is a 4 white LED driver for small LCD backlight. At the charge pump type, the number of external devices is minimized. Features 1) 4 parallel LED driver is mounted. 2) The LED current can be controlled via an external resistance. 3) Maximum current is 120mA (30mA 4). 4) LED1 to LED4 can be turned on or off via an external control pin. 5) The relative current accuracy among LEDs (LED1 to LED4) is 3%. 6) Automatically transition to each mode (1.0, 1.5, 2.0). 7) High efficiency (90% or more at maximum) is achieved. 8) Various protection functions such as output voltage protection function, current overload limiter and thermal shutdown circuit are mounted. Applications This driver provides for: - Backlight using white LED - Auxiliary lights for mobile phone cameras and simplified flash Lineup Parameter BD1604MUV BD1604MVV Number of LED channels 4ch 4ch Maximum current 120mA 120mA VQFN016V3030 SQFN016V4040 Package 3.00mm3.00mm 4.00mm4.00mm Absolute Maximum Rating (Ta=25 ) Parameter Symbol Ratings Unit Power supply voltage Vmax 7 V 1 BD1604MUV 700 * Allowable loss Pd mW 2 BD1604MVV 780 * Operating temperature range Topr 30~85 Storage temperature range Tstr 55~150 *1 When a glass epoxy substrate (70mm70mm1.6mm) has been mounted, this loss will decrease 5.6mW/ if Ta is higher than or equal to 25. *2 When a glass epoxy substrate (70mm70mm1.6mm) has been mounted, this loss will decrease 6.24mW/ if Ta is higher than or equal to 25. Recommended Operation Range Parameter Symbol Limits Unit Condition Operating supply voltage VBAT 2.75.5 V VBAT voltage www.rohm.com 2011.06 - Rev.B 1/10 2011 ROHM Co., Ltd. All rights reserved. Technical Note BD1604MUV, BD1604MVV Electrical Characteristics Unless otherwise specified, Ta is 25 and VBAT is 3.6V. Limits Parameter Symbol Unit Condition Min. Typ. Max. Circuit current Circuit current 0 IQ0 - 0.1 1 A EN=0V Circuit current 1.0 IQ1.0 - 1.0 2.0 mA x1.0 Mode, Iout = 0mA Circuit current 1.5 IQ1.5 - 2.3 3.3 mA x1.5 Mode, Iout = 0mA Circuit current 2.0 IQ2.0 - 2.5 3.5 mA X2.0 Mode, Iout = 0mA Unless otherwise specified, Ta is 25 and VBAT is 3.6V. Limits Parameter Symbol Unit Condition Min. Typ. Max. Current driver LED maximum current ILEDmax - - 30 mA LED current accuracy ILEDdiff - 0.5 5.0 % ILED=10mA LED current matching ILEDmatch - 0.5 3.0 % ILED=10mA *1) Minimum voltage LED pin control voltage VLED 0.08 0.10 0.20 V at LED1~LED4 pins ISET voltage ISET 0.5 0.6 0.7 V Oscillation frequency Fosc 0.8 1.0 1.2 MHz Over current limiter IOV - 600 900 mA LED current limiter ILEDOV 40 60 100 mA *1) LED current matching = (ILEDmax-ILEDmin)/(ILEDmax+ILEDmin)*100 ILEDmax : Maximum value of LED1-4 current ILEDmin : Minimum value of LED1-4 current Unless otherwise specified, Ta is 25 and VBAT is 5.5V. Limits Parameter Symbol Unit Condition Min. Typ. Max. Control Signal etc. Input H voltage VIH 1.4 - - V EN,SEL0,SEL1,SEL2 Input L voltage VIL - - 0.4 V EN,SEL0,SEL1,SEL2 Input H current1 IIH1 - 18.3 30 A EN=5.5V Input H current2 IIH2 - 0 1 A SEL0,SEL1,SEL2=5.5V Input L current IIL -1 0 - A EN,SEL0,SEL1,SEL2=0V Unless otherwise specified, Ta is 25 and VBAT is 3.6V. Limits Parameter Symbol Unit Condition Min. Typ. Max. Control Signal etc. UVLO detecting voltage VUVLO 1.9 2.2 2.5 V www.rohm.com 2011.06 - Rev.B 2/10 2011 ROHM Co., Ltd. All rights reserved.