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SC624A

Semtech Corporation
Part Number SC624A
Manufacturer Semtech Corporation
Description LED Light Management Unit Charge Pump
Published Dec 22, 2009
Detailed Description SC624A LED Light Management Unit POWER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ „ „ „ Charge Pump, 4 LEDs, Dual LDOs, an...
Datasheet PDF File SC624A PDF File

SC624A
SC624A

Overview
SC624A LED Light Management Unit POWER MANAGEMENT Features „ „ „ „ „ „ „ „ „ „ „ „ „ Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface Description The SC624A is a high efficiency charge pump LED driver using Semtech’s proprietary mAhXLifeTM technology.
Performance is optimized for use in single-cell Li-ion battery applications.
The charge pump provides backlight current in conjunction with four matched current sinks.
The load and supply conditions determine whether the charge pump operates in 1x, 1.
5x, or 2x mode.
An optional fading feature that gradually adjusts the backlight current is provided to simplify control software.
The SC624A also provides two low-dropout, low-noise linear regulators for powering a camera module or other peripheral circuits.
The SC624A uses an I2C compatible serial interface.
The interface controls all functions of the device, including backlight current and two LDO voltage outputs.
In sleep mode, the device reduces quiescent current to 100μA while continuing to monitor the serial interface.
The two LDOs can be enabled when the device is in sleep mode.
Total current reduces to 0.
1μA in shutdown.
Input supply voltage range — 3.
0V to 5.
5V Charge pump modes — 1x, 1.
5x and 2x Four programmable current sinks with 32 steps from 0.
5mA to 25mA Two user-configurable 100mA low-noise LDO regulators Charge pump frequency — 250kHz I2C compatible interface — up to 400kHz Backlight current accuracy ±1.
5% typical Backlight current matching ±0.
5% typical Programmable fade-in/fade-out for main backlight Automatic sleep mode (LEDs off ) — IQ = 100μA Low shutdown current — 0.
1μA (typical) Ultra-thin package — 3mm x 3mm x 0.
6mm Fully WEEE and RoHS compliant Applications „ Cellular phone backlighting „ PDA backlighting „ Camera I/O and core power www.
DataSheet4U.
com Typical Application Circuit MAIN BACKLIGHT VBAT CIN 1μ F VIN I2C Data I2C Clock SDA SCL EN BYP CBYP 22nF AGND PGND C1+ C1 1μ F C1BL 1 BL 2 BL 3 BL 4 LDO 1 LDO 2 C2+ C2C2 1μ F CLDO1 1μ F VLDO1...


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