IS31BL3230

IS31BL3230 8 CHANNELS CONSTANT CURRENT LED DRIVER WITH PWM BRIGHTNESS CONTROL February 2012 GENERAL DESCRIPTION The IS31BL3230 provides eight regulated current sources, each delivers up to 40mA of load current with careful selection of external sense resistors, all outputs at the IS31BL3230 may be connected in parallel to enable the current through the LED to be as high as 320mA. The IS31BL3230 does not include a charge pump and therefore has no noise and significantly improved the efficiency. The external resistor, RSET1, determines the constant current output of ports LED1 thru LED4, while resistor RSET2 determines the constant current output of ports LED5 thru LED8. Brightness can be controlled with PWM techniques. The constant current source is set with two external sense resistors. Alternatively, a PWM signal applied to the PWM pin can vary the perceived brightness of the LED. The device is in shut down mode when the PWM Input is logic low. FEATURES  Ultra low headroom voltage  Cost effective LED driver  Current adjustable via external resistors  Best Noise and Efficiency Performance  Highly integrated design, minimal component  1.6μA (typ.) Shutdown current  Small package QFN-16 3mm×3mm APPLICATIONS  Flash LED driver  Backlight LED driver TYPICAL APPLICATION CIRCUIT http://www.DataSheet4U.net/ VIN Cin 1uF PWM ISET1 ISET2 RSET1 RSET2 GND LED1 LED2 LED3 LED4 LED5 LED6 LED7 LED8 Figure 1 Typical Application Circuit Integrated Silicon Solution, Inc. – www....