IS31BL3230 8 CHANNELS CONSTANT CURRENT LED DRIVER WITH PWM BRIGHTNESS CONTROL March 2015 GENERAL DESCRIPTION FEATURES The IS31BL3230 provides eight regulated current Ultra low headroom voltage sources, each delivers up to 90mA of load current with Total output current can be 720mA careful selection of external sense resistors, all outputs Cost effective LED driver at the IS31BL3230 may be connected in parallel to Current adjustable via external resistors enable the current through the LED to be as high as Best noise and efficiency performance 720mA. Highly integrated design, minimal component The IS31BL3230 does not include a charge pump and 1.6 A (Typ.) shutdown current therefore has no noise and significantly improved the Small package QFN-16 (3mm3mm) efficiency. The external resistor, R , determines the SET1 constant current output of ports LED1 thru LED4, while resistor R determines the constant current output of SET2 APPLICATIONS ports LED5 thru LED8. Flash LED driver Brightness can be controlled with PWM techniques. The Backlight LED driver 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. TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit for Flash LED Driving Lumissil Microsystems www.lumissil.com 1 Rev. B, 02/09/2015 IS31BL3230 Figure 2 Typical Application Circuit for 8 LEDs Driving Lumissil Microsystems www.lumissil.com 2 Rev. B, 02/09/2015