MIC2291 - Micrel Semiconductor

MIC2291 1.2A PWM Boost Regulator Photo Flash LED Driver

The MIC2291 is a 1.2MHz Pulse Width Modulation (PWM), boost-switching regulator that is optimized for high-current, white LED photo flash applications. With a guaranteed switch current of 1.2A, the MIC2291 easily drives a string of 3 white LEDs in series at 100mA, ensuring a high level of brightness and eliminating several ballast resistors. The MIC2291 impl.

Features

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• 2.5V to 10V input voltage Output voltage up to 34V 1.2A switch current 1.2MHz PWM operation 95mV feedback voltage Overvoltage protection (OVP)
  – Options for 15V and 34V Stable with ceramic capacitors <1% line and load regulation 1µA shutdown current Over temperature protection UVLO Low-profile Thin SOT23-5 package option 2mm × 2mm MLF™ package option
  –40°C to +125°C junction temperature range Applications
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• Photo Flash LED driver Cell phones PDAs GPS systems Digital cameras IP phones LED flashlights Typical Application 10µH 100mA 10µH 100mA MIC2291BD5.