MIC2290

2mm × 2mm PWM Boost Regulator

with Internal Schotty Diode

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

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

408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

October 2007

M9999-101907

General Description

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

regulator housed in the small size 2mm × 2mm 8-pin MLF

®

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.

Data sheets and 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

4, 8

L1

10µH

R2

R1

1

7

3

2

MIC2290

VIN

Li Ion

Battery

VOUT

12V

EN

SW

OUT

GND

VIN

C1

1µF

C2

10µF

FB

6

Simple 12V Boost Regulator

60

65

70

75

80

85

0

0.02 0.04 0.06 0.08

0.1

LOAD CURRENT (A)

12VOUT Efficiency

V

IN =4.2V

V

IN =3.2V

V

IN =3.6V