General Description

The MIC3291 is a PWM switching boost regulator that is optimized for constant current white LED (WLED) driver applications. The MIC3291 features an internal Schottky diode, allowing an efficient DC/DC solution that requires only four external components.

Features

• Single wire combines 16 level linear brightness and shutdown control

• 18V / 25V OVP options supports up to four and six WLEDs

• Startup in any one of 16 brightness levels

• Internal Schottky diode

• 2.5V to 6.5V input voltage

• 1.2MHz PWM operation

• Over 500mA switch current

• 250mV reference voltage

• ±5 LED current accuracy

• <1µA shutdown current

• UVLO and over-temperature protection

• Thin SOT23-6L package option

• 2mm × 2mm leadless MLF® package option

• –40°C to +125°C junction temperature range

Applications

• Mobile handsets

• LCD handset backlighting

• Digital cameras

• Portable media players/MP3 players

• Portable applications