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SC614DB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC614DB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 25 page  1 POWER MANAGEMENT SC614 Low Noise Backlight and Flash Driver With Serial Interface United States Patent No. 6,504,422 www.semtech.com POWER MANAGEMENT April 28, 2006 Features Four independent current sinks for main backlight, adjustable from 0.4mA to 32mA each Dedicated MDIM pin for PWM dimming of main backlight Three independent current sinks for sub-backlight or flash, adjustable from 0.4mA to 102mA each Configurable sub-backlight or flash sinks Dedicated SDIM pin for PWM dimming of sub- backlight Dedicated FL pin for flash control Current accuracy to within ±1.5% down to 4.8mA Current matching to within ±0.5% down to 4.8mA Very high efficiency over 90% of battery life Shutdown current 0.1μA (typ) Three charge pump operating modes: 1x, 1.5x, and 2x I2C serial interface Soft-start/in-rush current limiting 1.33MHz and 250kHz programmable fixed frequency options Short-circuit/thermal protection Output open circuit protection MLPQ-24 package (4mm x 4mm), fully WEEE and RoHS compliant Cellular phone backlighting and flash LCD modules PDA backlighting and flash RGB LED Driver The SC614 is a high efficiency charge pump LED driver using Semtech’s proprietary mAhXLifeTM technology. Performance is optimized for use in Li-ion battery applications. Each of 7 LED currents can be programmed via the I2C serial control bus. M1 through M4 are for LED backlighting of LCD main displays. S1/FL3 through S3/FL1 can be used for backlighting sub displays and/ or for driving flash LEDs. These three current sinks are configurable over the I2C interface for any combination of pins for sub or flash use. The charge pump automatically selects an operating mode based on the number of active loads, input voltage, and load currents required. Any combination of LED drivers can be enabled at one time, allowing the SC614 to power any combination of backlight and flash required by the application. Two dedicated pins, MDIM and SDIM, are provided to allow PWM dimming of the main and sub-backlights and one dedicated pin, FL, allows direct control of the flash. All three pins can be utilized without having to use the I2C interface once the registers are set up. The enable pin can be used to put the device in low-current shutdown mode drawing 0.1μA (typ), or a reg- ister can be written that sets the device in a sleep mode that reduces the current to 50μA (typ). Description D1 LED C2 1u 434mA Max (500ms) D2 LED D3 LED D4 LED D5 LED 32mA Max 32mA Max 32mA Max 32mA Max 306mA Max. C1 2u2 C3 1u C4 1u VIN 11 VIN 17 EN 2 SDA 7 SCL 8 ASEL 5 SDIM 3 MDIM 4 FL 6 VOUT 9 VOUT 16 M1 1 M2 24 M3 23 M4 22 S1/FL3 20 S2/FL2 19 S3/FL1 18 GND 12 GND 21 U1 SC614 EN SDA SCL SDIM FL MDIM 328mA Max Continuous VBAT R1 Pull-up R2 Pull-up VLOGIC Note: R1 and R2 pull-up resistors are a requirement of the I2C specification MAIN BACKLIGHT FLASH Typical Application Circuit Applications |
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