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A8431 - White LED Driver Constant Current Step-up Converter

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Overview

www.DataSheet4U.com Preliminary Data Sheet Subject to Change without Notice April 5, 2005 A8431 The A8431 is a noninverting boost dc-dc converter that provides a programmable constant current output up to 32 V for driving white LEDs in series.The A8431 also offers an OVP (overvoltage protection) pin.

Driving the LEDs in series ensures identical currents and uniform brightness.

Up to four white LEDs can be driven at 20 mA from a single cell Li-ion or a multicell NiMH power source.

Key Features

  • Output voltage up to 32 V (OVP level) 2.5 V to 10 V input Drives up to 4 LEDs at 20 mA from a 2.5 V supply Drives up to 5 LEDs at 20 mA from a 3 V supply 1.2 MHz switching frequency 300 mA switch current limit 1 µA shutdown current OVP pin eliminates the need for an external Zener diode on the output.

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