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SP7682ER1-L Datasheet

  • SP7682ER1-L

  • Backlight and Flash Driver in QFN 3mm x 3mm

  • 19頁

  • EXAR   EXAR

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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
2
C serial interface
VIN
SP7682A 鈥?Single Line Programmable Serial Interface
PGND
2.4MHz switching frequency
Flash LED output current adjustable in 10mA steps to 500mA
EN
Backlight LED output current adjustable in 0.5mA steps to 31.5mA
SCL (SETFL)
Power-saving shutdown mode of 1渭A
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
C1+
C2+
VOUT
SGND
LED 1
LED 2
SDA (SETBL)
FLASH
LED 4
LED 3
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
2
C 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
C1 1uF
VIN = 2.7V to 5.5V
VIN C1+ C1- C2+
C
IN
SDA (SETBL)
SCL (SETFL)
4.7uF
SDA (SETBL)
SCL (SETFL)
FLASH
Flash
C2-
VOUT
C
OUT
2.2uF
C2 1uF
C1-
C2-
SP7682
(SP7682A)
EN
EN
LED1
LED2
LED3
LED4
PGND SGND
Sept 27-07 rev G
SP7682: Backlight and Flash Driver
Page 1
漏
2007 Exar Corporation

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