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SC658ULTRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC658ULTRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 22 page  © 2009 Semtech Corporation POWER MANAGEMENT US Patents: 6,504,422; 6,794,926 Typical Application Circuit SC658 Backlight Driver for 4 LEDs with SemPulseTM Interface SC658 IN SPIF GND OUT BL1 CIN 2.2µF 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 — x, .5x and 2x Four 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 — ±.5% typical Backlight current matching — ±0.5% typical LED float detection Automatic sleep mode (LEDs off) — I Q = 60µA (typ.) Shutdown current — 0.µA (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 SC658 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 four matched current sinks. The load and supply conditions determine whether the charge pump operates in x, .5x, or 2x mode. An optional fading feature that gradually adjusts the backlight current is provided to simplify control software. The SC658 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 four LEDs can be grouped in up to three separate banks that can be independently controlled. The SC658 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 SC658 provides a complete LED driver solution with a minimal PCB footprint. April 3, 2009 |
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