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Date: 12/15/04

SP6685 Charge Pump LED Driver for Camera Flash

© Copyright 2004 Sipex Corporation

SP6685

DESCRIPTION

The SP6685 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 SP6685 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 SP6685 is offered in 10-pin DFN package.

®

TYPICAL APPLICATION CIRCUIT

FEATURES

■ High Output Current Charge Pump: 700mA

■ 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

■ 1 µA shutdown current

■ PWM Dimming Control

■ Over voltage protection on output

■ Over current protection

■ Over temperature protection

■ Space Saving 10-pin 3mm x 3mm DFN

Package

APPLICATIONS

■ LED Torch/Flash for Cell

Phones, DSCs, and Camcorders

■ Generic Lighting/Flash/Strobe

Applications

Charge Pump LED Driver For Camera Flash

Preliminary

Now Available in Lead Free Packaging

SP6685

10 Pin DFN

10

9

8

7

6

VOUT

PGND

SGND

FB

RSET

1

2

3

4

5

VIN

C1

C2

FLASH

EN

SP6685

®

D1

1W LED

ENABLE

TORCH/FLASH

C1

C2

FLASH

FB

4.7µF

(2.7 - 4.3V)

1µF

1µF

EN

0.22

Ω

88.7K