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MIC2290
(Rev.:2004)

2mm × 2mm PWM Boost Regulator with Internal Schotty Diode

Micrel 

MIC2290

Micrel

MIC2290

2mm × 2mm PWM Boost Regulator with

Internal Schotty Diode

General Description

The MIC2290 is a 1.2MHz , PWM, boost-switching regulator

housed in the small size 2mm × 2mm MLF™-8 package. The

MIC2290 features an internal Schottky diode that reduces

circuit board area and total solution cost. High power density

is achieved with the MIC2290’s internal 34V/0.5A switch,

allowing it to power large loads in a tiny footprint.

The MIC2290 implements a constant frequency 1.2MHz

PWM control scheme. The high frequency operation saves

board space by reducing external component sizes. The

fixed frequency PWM topology also reduces switching noise

and ripple to the input power source.

The MIC2290’s wide 2.5V to 10V input voltage allows direct

operation from 3- to 4-cell NiCad/NiMH/Alkaline batteries, 1-

and 2-cell Li Ion batteries, as well as fixed 3.3V and 5V

systems.

The MIC2290 is available in a low-profile 2mm × 2mm

8-pin MLF™ leadless package and operates from a junction

temperature range of –40°C to +125°C.

All support documentation can be found on Micrel’s web

site at www.micrel.com.

Features

• Internal Schottky diode

• 2.5V to 10V input voltage

• Output voltage adjustable to 34V

• Over 500mA switch current

• 1.2MHz PWM operation

• Stable with ceramic capacitors

• <1% line and load regulation

• Low input and output ripple

• <1µA shutdown current

• UVLO

• Output overvoltage protection

• Over temperature protection

• 2mm × 2mm 8-pin MLF™ package

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

Applications

• Organic EL power supply

• TFT LCD bias supply

• 12V DSL power supply

• CCD bias supply

• SEPIC converters

Typical Application

L1

VIN

10µH

Li Ion

Battery

MIC2290BML

2

7

VIN SW

3

1

EN OUT

C1

6

1µF

FB

GND

4, 8

VOUT

12V

R1

C2

10µF

R2

Simple 12V Boost Regulator

12VOUT Efficiency

85

VIN = 4.2V

80

75 VIN = 3.2V

70

VIN = 3.6V

65

600 0.02 0.04 0.06 0.08 0.1

LOAD CURRENT (A)

MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

August 2004

1

M9999-081104

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