August 2004

1

M9999-081104

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.

Typical Application

4, 8

L1

10

µH

R2

R1

1

7

3

2

MIC2290BML

VIN

Li Ion

Battery

12V

EN

SW

OUT

GND

C1

1

µF

C2

10

µF

FB

6

Simple 12V Boost Regulator

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

• <1

µA 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

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

60

65

70

75

80

85

0

0.02

0.04

0.06

0.08

0.1

LOAD CURRENT (A)

12V

OUT

Efficiency

V

V

V