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SC627A Datasheet(PDF) 1 Page - Semtech Corporation |
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SC627A Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 24 page POWER MANAGEMENT 1 SC627A LED Light Management Unit Charge Pump, 4 LEDs, 700mA Flash LED, 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 Flash LED — 700mA max in flash mode, 250mA max continuous for spotlight 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 External flash control pin to sync with camera Optional 1s flash time out 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 and flash PDA backlighting and flash Camera I/O and core power Description The SC627A 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. It also can supply continuous or bursted current to a flash LED using the dedicated flash driver current sink. 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. A flash-timeout feature disables the flash if active for longer than 1 second. The SC627A also provides two low-dropout, low-noise linear regulators for powering a camera module or other peripheral circuits. The SC627A uses an I2C compatible serial interface. The interface controls all functions of the device, including backlight and flash currents as well as two LDO voltage outputs. The flash/spotlight output is triggered via either the I2C interface or a dedicated pin. 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. SC627A VIN SDA FLEN BYP AGND PGND VOUT BL 1 BL 2 BL 3 FL BL 4 FLASH CIN 2.2μF MAIN BACKLIGHT LDO 1 LDO 2 1 C + C1- C2+ C2- I2C Data Flash Control VLDO1 = 2.5V to 3.3V VLDO2 = 1.5V to 1.8V Enable Control I2C Clock SCL EN VBAT CBYP 22nF C1 2.2μF C2 2.2μF COUT 4.7μF CLDO2 1μF CLDO1 1μF US Patents: 6,504,422; 6,794,926 Typical Application Circuit May 21, 2007 |
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