June 21-07 revH

SP7680: Complete Backlight Solution

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2007 Sipex Corporation

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FEATURES

Complete Backlight Solution

Separate control for 4 main, 2 sub, and keypad LEDs

Built-in 6-bit DAC for precise current setting

I

Data is stored in shutdown

1x and 1.5x mode operation with automatic switchover

Very low dropout: 200mV typ

Very low 31µA current (LSB)

2MHz switching frequency reduces external components

Power-saving shutdown mode of 1µA

Built-in over-temperature protection

Available in Lead Free, RoHS compliant package:

Small 16-pin 3x3 QFN

DESCRIPTION

The SP7680 is a complete backlight display solution that is designed to independently control LEDs for

main and auxiliary displays as well as the keypad. A two line I

adjust each current individually in order to provide ultimate flexibility in driving LEDs. 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. Extra low 33µA LSB allows trickle current through the LEDs for non-

reflecting LCD displays. The SP7680 automatically detects 1x or 1.5x operation for optimal efficiency.

TYPICAL APPLICATION CIRCUIT

MAIN

SUB

AUX

VIN

C1

C2

0.47µF

0.47µF

VOUT

SDA

SCL

VIN

2.2µF

1µF

SP7680

LED 1

GND

C2+

C2-

LED 6

LED 7

SDA

SCL

Solved by

TM

SP7680

Complete Backlight Solution

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