Nov28-06 RevC

ANP8: SP6648 Flashlight Solution

© 2006 Sipex Corporation

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FEATURES

1.8V → 3.2V Input range

Regulated 350mA output current

Highly integrated design, minimal components

On chip synchronous power switches

Small 3x3mm 10 Pin DFN package

High efficiency: Greater than 90%

Constant brightness over full battery range

Uses 2 cell Alkaline, NiCAD or NiMH battery

Also works for Lithium camera battery

Efficiency over full battery

voltage range.

Introduction

The SP6648 integrated synchronous boost regulator is a compact circuit that provides a ultra-

shown below is configured to provide 350mA constant output current for a two cell alkaline

battery application. All components are compact surface mount devices, yielding a tiny final

solution.

Diode D1 has been added to reduce the effective feedback voltage from 1.25V down to 0.61V to

improve efficiency. The LED current can be programmed as high as 900mA depending on the set

resistor value. Operating quiescent current of the part is only 12uA, so only a negligible amount of

power is used by the part itself. The SP6648 is available in MSOP for easy pin access in proto-

type and testing, and also 3x3mm DFN for the smallest production circuit.

Application Schematic

Solved by

TM

APPLICATION NOTE ANP8

SP6648 Flashlight Application