Backlight Driver For 7 LEDs With Charge Pump And PWM Control

The SC656 is a high efciency 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 seven matched current sinks. The load and supply conditions determine whether the Charge Pump operates in x, .5x, or 2x mode. The seven backlights CAN be confgured as a single group or split into two independent banks by setting the state of the BANK2 and BANK pins. If only one bank is needed, the BANK2, BANK, ENS and ISETS pins must be grounded. The maximum current per LED in each bank is set by a resistor connected to ISETM or ISETS. LED current CAN be set between 500µA and 25mA. Backlight current is varied by applying a pulse-width modulated (PWM) signal to the ENM pin for the main LED bank and the ENS pin for the sub LED bank. The resulting DC current in each LED (I BL ) is equal to the maximum current setting multiplied by the duty cycle of the PWM signal. During PWM operation, a low-pass flter is used to develop a DC current through the LED The resulting power conversion is more efcient than comparable pulsed current solutions. Backlight fading is initiated when the duty cycle is changed. By Semtech Corporation
SC656 's PackagesSC656 's pdf datasheet

SC656 Pinout, Pinouts
SC656 pinout,Pin out
This is one package pinout of SC656,If you need more pinouts please download SC656's pdf datasheet.

SC656 Application circuits
SC656 circuits
This is one application circuit of SC656,If you need more circuits,please download SC656's pdf datasheet.

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