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SC662 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC662 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 30 page  © 2010 Semtech Corporation SC662 Backlight Driver for 6 LEDs with SemPulse ® Interface POWER MANAGEMENT 1 SC662 IN SPIF GND OUT BL1 CIN 1.0µF C1+ From Microprocessor COUT 1.0µF C2 1.0µF C1 1.0µF BL2 BL3 BL4 C2+ C1- C2- BL5 BL6 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 Selectable charge pump frequency — 250kHz/1MHz SemPulse® single wire interface Backlight current accuracy — ±1.5% typical Backlight current matching — ±0.5% typical LED float detection Automatic sleep mode with all LEDs off Sleep mode quiescent current — 60µA typical Shutdown current — 0.1µA typical Ultra-thin package — 2 x 2 x 0.6 (mm) Lead-free and halogen-free 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 SC662 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 SC662 uses the proprietary SemPulse ® 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 charge pump switches at 1MHz or 250kHz, and the frequency is selectable using the SemPulse interface. Both 1MHz and 250kHz frequencies are supported by 0402 size (1005 metric) ceramic capacitors. The SC662 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. November 30, 2010 Typical Application Circuit |
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