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SP7682A Datasheet(PDF) 1 Page - Exar Corporation |
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SP7682A Datasheet(HTML) 1 Page - Exar Corporation |
1 / 19 page Sept 27-07 rev G SP7682: Backlight and Flash Driver © 2007 Exar Corporation Page 1 SP7682/SP7682A Backlight and Flash Driver in QFN 3mm x 3mm FEATURES Output current up to 500mA for Flash LED Up to 94% efficiency in 1x mode Triple mode 1x, 1.5x and 2x charge pump Built-in current setting DAC SP7682 - I 2C serial interface SP7682A – Single Line Programmable Serial Interface 2.4MHz switching frequency Flash LED output current adjustable in 10mA steps to 500mA Backlight LED output current adjustable in 0.5mA steps to 31.5mA Power-saving shutdown mode of 1μA Time Out function to protect the LED in Flash mode (2s) Thermal shutdown protection Built-in over-voltage and over-current protection Automatic soft start limits in-rush current Lead Free, RoHS Compliant Packaging: Space saving 16-pin 3X3mm QFN package DESCRIPTION The SP7682 or SP7682A provides a complete LED backlight and flash solution that is designed to drive 4 low current LEDs for backlighting and a single channel high current output for a LED flash. The SP7682 and SP7682A have serial interfaces that can program the backlight LED current in steps of 0.5mA up to 31.5mA and flash LED current in steps of 10mA up to 500mA. The SP7682A uses two single line serial interfaces for programming the backlight current and flash current. The SP7682 uses an I 2C serial interface which also allows programming active, standby and shutdown states, selecting flash timeout periods and switching individual LEDs for the backlight. The data is loaded into internal registers upon power up and stored while in shutdown. When the chip is enabled, the stored values set the LED currents. The SP7682/SP7682A automatically detects 1x, 1.5x or 2x operation for optimal efficiency. TYPICAL APPLICATION CIRCUIT VIN = 2.7V to 5.5V C1 1uF VOUT SDA (SETBL) 4.7uF 2.2uF SP7682 (SP7682A) Flash SDA (SETBL) FLASH SCL (SETFL) SCL (SETFL) C2 1uF LED1 LED2 LED3 LED4 EN EN VIN PGND EN SCL (SETFL) VOUT SGND LED 1 LED 2 VIN C1+ C1- C2+ C2- PGND SGND CIN COUT |
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