Backlight Driver For 5 LEDs With Charge Pump And PWM Control

The SC652 is a high ei ciency Charge Pump LED Driver using Semtech’s proprietary Charge Pump technology. Performance is optimized for use in single-cell Li-ion battery applications. The device provides backlight current using up to five matched current sinks. The load and supply conditions determine whether the Charge Pump operates in 1x, 1.5x, or 2x mode. The maximum current per LED is set by a resistor (RISET ) connected from the ISET pin to the input voltage. The current CAN be set between 500μA and 25mA. This current CAN be varied by applying a pulse-width modulated (PWM) signal to the EN/PWM pin. A low-pass Filter is used to develop a DC current level rather than a pulsed current output, resulting in a more ei cient system. The resulting DC current in each LED (I BL ) is equal to the maximum current setting multiplied by the duty cycle of the PWM control signal. Using this control system, I BL CAN gradually fade between levels. With a 2 x 2 (mm) package and 4 small capacitors, the SC652 provides a complete LED Driver solution with a minimal PCB footprint. By Semtech Corporation
SC652 's PackagesSC652 's pdf datasheet

SC652 Pinout, Pinouts
SC652 pinout,Pin out
This is one package pinout of SC652,If you need more pinouts please download SC652's pdf datasheet.

SC652 Application circuits
SC652 circuits
This is one application circuit of SC652,If you need more circuits,please download SC652's pdf datasheet.

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