MIC2250

High Efficiency Low EMI

Boost Regulator

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

November 2008

M9999-111708-A

General Description

The MIC2250 is a general purpose DC/DC boost switching

regulator that features low noise, EMI reduction circuitry,

and high efficiency across a wide output current range.

The MIC2250 is optimized for noise-sensitive hand held

battery powered applications. A proprietary control method

allows low ripple across the output voltage and current

ranges. The MIC2250 incorporates a pseudo-random

dithering function to reduce EMI levels up to 10dB enabled

by the DITH pin.

The MIC2250 is designed for use with inductor values from

4.7µH to 22µH, and is stable with ceramic capacitors from

1µF to 22µF.

The MIC2250 attains a high peak efficiency up to 90% at

100mA and excellent light load efficiency of 80% at 1mA.

High power density is achieved with the MIC2250’s

internal 34V/2A rated switch, allowing it to power large

loads in a tiny footprint.

The MIC2250 is available in a 8-pin 2mm x 2mm MLF

®

leadless package option with an operating junction

temperature range of –40°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• Over 80% efficient for a 300:1 load range

• 2.5V to 5.5V input voltage range

• Output voltage adjustable to 32V

• 2A switch current

• Constant peak current control reduces output ripple

• EMI reduction circuitry

• Stable with small ceramic capacitors

• <1µA shutdown current

• UVLO and thermal shutdown

Applications

• LCD/OLED display bias supply

• CCD bias supply

• Mobile Phones, PDA, Media Players, GPS PND

• Haptic displays

• Local 5V, 15V, 24V rail

___________________________________________________________________________________________________________

Typical Application