SP6686ER-L/TR 查看數據表（PDF） - Signal Processing Technologies

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SP6686ER-L/TR

400mA Buck/Boost Charge Pump LED Driver

Signal Processing Technologies 

SP6686

400mA Buck/Boost Charge Pump LED Driver

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

VIN 1

C1 2

C2 3

FLASH 4

EN 5

10

SP6686 9

8

10 Pin DFN

7

6

VOUT

PGND

SGND

IFB

ISET

■ High Frequency Operation: 2.4 MHz

■ Low 50mV reference for low loss sensing

Now Available in Lead Free Packaging

■ 1µA shutdown current

■ PWM Dimming Control

■ Automatic switchover between buck/boost

■ Over voltage protection on output

■ Over current/temerature protection

■ Low Ripple and EMI

APPLICATIONS

■ White LED Torch/Flash for Cell

Phones, DSCs, and Camcorders

■ Generic Lighting/Flash/Strobe

Applications

■ Space Saving 10-pin 3mm x 3mm DFN

Package

■ White LED Backlighting

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

VIN

(2.7 - 5.5V)

CIN

2.2µF

CFC

0.47µF

TORCH/FLASH

ENABLE

VIN

® VOUT

C1 SP6686 PGND

C2

FLASH

SGND

FB

EN

RSET

400mA FLASH

COUT

1µF

WLED

RSET

106K Ω

RSENSE

0.33Ω

Date: 03/10/06

SP6686 400mA, Buck/Boost Charge Pump LED Driver

1

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