Exar offers a broad array of power management integrated circuits (
ICs) that are used in a wide variety of end applications.
Exar’s state of the art solutions provide high efficiency, low quiescent current, small size and the industry’s best price/performance ratio.
Many of Exar’s most advanced power management ICs are offered in thermally enhanced, lead-free DFN or QFN packages for the best blend of low thermal impedance and minimal circuit board area.
Exar power management products can be used as stand alone solutions but are designed to be used together to create a complete power management system. This product group includes low drop out linear regulators (LDOs), DC to DC switching regulators, PWM controllers, charge pumps, and microprocessor supervisors.
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 I2C 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.
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
- I2C 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