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7 0 0 m A B u c k / B o o s t C h a r g e P u m p L E D D r i v e r
June 2009
GENERAL 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 regulated 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 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.
Rev. 2.0.0
APPLICATIONS
? White LED Torch/Flash for Cell Phone,
DSCs and Camcorders
? White LED Backlighting
? Generic Lighting/Flash Application
? General Purpose High Current Boost
FEATURES
? Output Current up to 700mA
? Up to 94% Efficiency in Torch Mode
? Minimum External Components:
No Inductor
? Adjustable FLASH Mode Current
? 1x and 2x Charge Pump Operation
? 2.4MHz High Frequency Operation
? I Q < 1μA in Shutdown
? Built-In Soft Start Limit Inrush Current
? Output Overvoltage Protection
? Over current/Temperature Protection
? 10pin 3x3mm DFN Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP6685 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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