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SC621 数据表(PDF) 1 Page - Semtech Corporation |
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SC621 数据表(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  POWER MANAGEMENT 1 SC621 LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, 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 Flash LED — 400mA max in flash mode, 250mA max continuous for spotlight 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 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 SC621 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 SC621 also provides two low-dropout, low-noise linear regulators for powering a camera module or other peripheral circuits. The SC621 uses the proprietary SemWireTM single wire interface. The interface controls all functions of the device, including backlight and flash currents as well as two LDO voltage outputs. The single wire implementation minimizes microcontroller and interface pin counts. The flash/spotlight output is triggered via either the SemWire 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. SC621 VIN SWIF FLEN BYP AGND PGND VOUT BL1 FL FLASH CIN 2.2μF MAIN BACKLIGHT LDO1 GREF C1+ SemWire Interface Flash Control VLDO1 = 2.5V to 3.3V VLDO2 = 1.5V to 1.8V VBAT CBYP 22nF COUT 4.7μF CLDO2 1μF CLDO1 1μF C2 2.2μF C1 2.2μF LDO2 BL2 BL3 BL4 C2+ C1- C2- US Patents: 6,504,422; 6,794,926 Typical Application Circuit June 27, 2007 |
类似零件编号 - SC621 |
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类似说明 - SC621 |
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