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SP6685ER

700mA Buck/Boost Charge Pump LED Driver

Signal Processing Technologies 

SP6685

700mA Buck/Boost Charge Pump LED Driver

FEATURES

■ Output Current up to 700mA

VIN 1

10 VOUT

■ Up to 94% Efficiency in Torch Mode

■ Adjustable FLASH Mode Current

■ Minimum External Components: No Inductors

■ Automatic Buck/Boost Mode Switchover

C1 2

C2 3

FLASH 4

SP6685 9

10 Pin DFN 8

7

PGND

SGND

FB

■ Wide VIN Range: 2.7V to 5.5V

EN 5

6 RSET

■ High Frequency Operation: 2.4 MHz

■ Low 50mV Reference for low Loss Sensing Now Available in Lead Free Packaging

■ IQ < 1μA in Shutdown

■ PWM Dimming Control

■ Automatic Soft Start Limits Inrush Current

■ Overvoltage Protection on Output

APPLICATIONS

■ White LED Torch/Flash for Cell

Phones, DSCs, and Camcorders

■ White LED Backlighting

■ Overcurrent/Temperature Protection

■ Low Ripple and EMI

■ Generic Lighting/Flash/Strobe

Applications

■ Ultra-low Dropout Voltage in Buck Mode

■ General Purpose High Current Boost

■ Space Saving 10-pin 3mm x 3mm DFN Package

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 the 10-pin DFN package.

VIN

(2.7 - 5.5V)

O

CIN

4.7μF

CFC

1μF

TORCH/FLASH

ENABLE

TYPICAL APPLICATION CIRCUIT

VIN

® VOUT

C1 SP6685 PGND

C2

FLASH

EN

SGND

FB

RSET

COUT

1μF

RSET

88KΩ

WLED

RSENSE

0.22Ω

Date: 7/6/06 Rev B

SP6685, 700mA Buck/BoostCharge Pump LED Driver

1

© 2006 Sipex Corporation

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