SP6686ER-L/TR 데이터 시트보기 (PDF) - Exar Corporation

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SP6686ER-L/TR

400mA Buck/Boost Charge Pump LED Driver

Exar Corporation 

August 2009

SP6686

400mA Buck/Boost Charge Pump LED Driver

Rev. 2.0.0

GENERAL 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 designed to operate from a

single cell lithium-ion battery or fixed 3.3V or

5.0V power rails and is available in a RoHS

compliant, “green”/halogen free space saving

10-pin 3mmx3mm DFN package

TYPICAL APPLICATION DIAGRAM

APPLICATIONS

• White LED Torch/Flash for Mobile

Phones, DSCs and Camcorders

• Generic Lighting/Flash/Strobe

Applications

• White LED Backlighting

FEATURES

• Output Current up to 400mA

• Up to 94% Efficiency in Torch Mode

• Adjustable FLASH Mode

• x1 and x2 Automatic Modes for High

Efficiency

• Minimum External Components: No

Inductors

• 2.4MHz High Frequency Operation

• 1μA Shutdown Current

• Built-In Soft Start Limit Inrush Current

• Output Overvoltage Protection

• Over current/Temperature Protection

• 10-pin 3mm x 3mm DFN Package

Fig. 1: SP6686 Application Diagram

Exar Corporation

48720 Kato Road, Fremont CA 94538, USA

www.exar.com

Tel. +1 510 668-7000 – Fax. +1 510 668-7001

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