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Date: 03/10/06

SP6686 400mA, Buck/Boost Charge Pump LED Driver

© Copyright 2006 Sipex Corporation

SP6686

DESCRIPTION

The SP6686 is a current regulated charge pump ideal for powering high brightness LEDs for

camera flash applications. The charge pump can be set to regulate two current levels for

FLASH and TORCH modes. The SP6686 automatically switches modes between step-up

and step-down ensuring that LED current does not depend on the forward voltage. A low

current sense reference voltage (50mV) allows the use of small 0603 current sensing

resistors. The SP6686 is offered in 10-pin DFN package.

TYPICAL APPLICATION CIRCUIT

FEATURES

■ Output Current up to 480mA

■ Up to 94% Efficiency in Torch Mode

■ Automatic Softstart limits inrush current

■ Adjustable FLASH mode

■ x1 and x2 Automatic Modes for High Efficiency

■ Minimum External Components: No Inductors

■ High Frequency Operation: 2.4 MHz

■ Low 50mV reference for low loss sensing

■ 1µA shutdown current

■ PWM Dimming Control

■ Automatic switchover between buck/boost

■ Over voltage protection on output

■ Over current/temerature protection

■ Low Ripple and EMI

■ Space Saving 10-pin 3mm x 3mm DFN

Package

APPLICATIONS

■ White LED Torch/Flash for Cell

Phones, DSCs, and Camcorders

■ Generic Lighting/Flash/Strobe

Applications

■ White LED Backlighting

400mA Buck/Boost Charge Pump LED Driver

Now Available in Lead Free Packaging

SP6686

10 Pin DFN

10

9

8

7

6

1

2

3

4

5

C1

C2

FLASH

EN

SP6686

®

ENABLE

TORCH/FLASH

C1

C2

FLASH

FB

2.2µF

(2.7 - 5.5V)

1µF

0.47µF

EN

400mA FLASH

106K

0.33

Ω

Ω

WLED