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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC654 датащи(PDF) 1 Page - Semtech Corporation |
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SC654 датащи(HTML) 1 Page - Semtech Corporation |
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1 / 22 page  © 2009 Semtech Corporation POWER MANAGEMENT 1 US Patents: 6,504,422; 6,794,926 Typical Application Circuit SC654 Light Management Unit for 6 LEDs with SemPulseTM Interface SC654 IN SPIF GND OUT BL1 BL5 CIN 2.2μF BL6 C1+ From Microprocessor VBAT = 2.9 to 5.5V COUT 2.2μF C2 2.2μF C1 2.2μF BL2 BL3 BL4 C2+ C1- C2- Features Input supply voltage range — 2.9V to 5.5V Very high efficiency charge pump driver system with three modes — 1x, 1.5x and 2x Six programmable current sinks — 0mA to 25mA Up to three LED grouping options Fade-in/fade-out feature for main LED bank Charge pump frequency — 250kHz SemPulse single wire interface Backlight current accuracy — ±1.5% typical Backlight current matching — ±0.5% typical LED float detection Automatic sleep mode (LEDs off ) — I Q = 60μA (typ.) Shutdown current — 0.1μA (typical) Ultra-thin package — 2 x 2 x 0.6 (mm) Fully WEEE and RoHS compliant Applications Cellular phones, smart phones, and PDAs LCD modules Portable media players Digital cameras Personal navigation devices Display/keypad backlighting and LED indicators Description The SC654 is a high efficiency charge pump LED driver using Semtech’s proprietary charge pump technology. Performance is optimized for use in single-cell Li-ion battery applications. The charge pump provides backlight current utilizing six 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 SC654 uses the proprietary SemPulseTM single wire interface to control all functions of the device, including backlight currents. The single wire interface minimizes microcontroller and interface pin counts. The six LEDs can be grouped in up to three separate banks that can be independently controlled. The SC654 enters sleep mode when all the LED drivers are disabled. In this mode, the quiescent current is reduced while the device continues to monitor the SemPulse interface. With a 2 x 2 (mm) package and four small capacitors, the SC654 provides a complete LED driver solution with a minimal PCB footprint. January 30, 2009 |
Аналогичный номер детали - SC654 |
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Аналогичное описание - SC654 |
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