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SC624AEVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC624AEVB Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 23 page POWER MANAGEMENT 1 SC624A LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface © 2007 Semtech Corporation Features 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 ) — I Q = 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 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 100 μA 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. SC624A VIN SDA BYP AGND PGND VOUT BL 1 BL 2 BL 3 BL 4 CIN 1μF MAIN BACKLIGHT LDO 1 LDO 2 1 C+ C1- C2+ C2- I2C Data VLDO1 = 2.5V to 3.3V VLDO2 = 1.5V to 1.8V Enable Control I2C Clock SCL EN VBAT CBYP 22nF C1 1μF C2 1μF COUT 2.2μF CLDO2 1μF CLDO1 1μF US Patents: 6,504,422; 6,794,926 Typical Application Circuit June 27, 2007 |
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