SP6685(2004) Просмотр технического описания (PDF) - Signal Processing Technologies

Номер в каталоге

Компоненты Описание

производитель

SP6685
(Rev.:2004)

Charge Pump LED Driver For Camera Flash

Signal Processing Technologies 

®

Preliminary

SP6685

Charge Pump LED Driver For Camera Flash

FEATURES

■ High Output Current Charge Pump: 700mA

VIN 1

10 VOUT

■ 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

C1 2

C2 3

FLASH 4

EN 5

SP6685

10 Pin DFN

9 PGND

8 SGND

7 FB

6 RSET

■ 1 µA shutdown current

■ PWM Dimming Control

Now Available in Lead Free Packaging

■ 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

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

VIN

(2.7 - 4.3V)

CIN

4.7µF

CFC

1µF

TORCH/FLASH

ENABLE

VIN

® VOUT

C1 SP6685 PGND

C2

FLASH

EN

SGND

FB

RSET

COUT

1µF

D1

1W LED

VREF = 50 - 150mV

RSET

88.7K

RSENSE

0.22Ω

Date: 12/15/04

SP6685 Charge Pump LED Driver for Camera Flash

1

© Copyright 2004 Sipex Corporation

Share Link: