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SC624 Scheda tecnica(PDF) 1 Page - Semtech Corporation |
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SC624 Scheda tecnica(HTML) 1 Page - Semtech Corporation |
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1 / 22 page  POWER MANAGEMENT 1 SC624 LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and SemWireTM 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 SemWireTM single wire interface — up to 75kbit/s 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 SC624 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 SC624 also provides two low-dropout, low-noise linear regulators for powering a camera module or other peripheral circuits. The SC624 uses the proprietary SemWireTM single wire interface. The interface controls all functions of the device, including backlight current and two LDO voltage outputs. The single wire implementation minimizes microcontroller and interface pin counts. 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. SC624 VIN SWIF BYP AGND PGND VOUT BL1 CIN 1μF MAIN BACKLIGHT LDO1 GREF C1+ SemWire Interface VLDO1 = 2.5V to 3.3V VLDO2 = 1.5V to 1.8V VBAT CBYP 22nF COUT 2.2μF CLDO2 1μF CLDO1 1μF C2 1μF C1 1μF LDO2 BL2 BL3 BL4 C2+ C1- C2- US Patents: 6,504,422; 6,794,926 Typical Application Circuit June 27, 2007 |
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