General Description

The MIC3287 is a 1.2MHz pulse width modulated (PWM) step-up switching regulator that is optimized for constant current white LED driving applications. With a switch current of over 350mA, the MIC3287-24 drives a string of up to 4 white LEDs in series, ensuring uniform brightness and eliminating several ballast resistors.

Features

• 2.8V to 6.5V Input Voltage

• 350mA Switch Current

• 1.2 MHz PWM Operation

• 250mV Feedback Voltage

• Optional 24V Output Over-Voltage Protection (OVP)

• Up to 36V Output Voltage without OVP

• <1 Line and Load Regulation

• <1µA Shutdown Current

• Over-Temperature Protection

• Under-Voltage Lock Out (UVLO)

• Low Profile Thin SOT-23-5 Package Option

• Low Profile Thin SOT-23-6 Package Option

• 8-pin 2mm x 2mm MLF® Package Option

• –40°C to +125°C Junction Temperature Range

Applications

• White LED Driver for Backlighting:

- Cell phones

- PDAs

- GPS systems

- Digital cameras

- MP3 players

- IP phones

• LED Flashlights

• Constant Current Power Supplies