MIC2208

3mmx3mm 1MHz 3A PWM Buck

Regulator

General Description

The Micrel MIC2208 is a high efficiency PWM buck

(step-down) regulator that provides up to 3A of

output current. The MIC2208 operates at 1MHz and

has external compensation that allows a closed loop

bandwidth of over 100KHz.

The low on-resistance internal p-channel MOSFET

of the MIC2208 allows efficiencies over 94%,

reduces external component count and eliminates

the need for an expensive current sense resistor.

The MIC2208 operates from 2.7V to 5.5V input and

the output can be adjusted down to 1V. The devices

can operate with a maximum duty cycle of 100% for

use in low-dropout conditions.

The MIC2208 is available in the exposed pad 3mm x

3mm MLF-12L package with a junction operating

range from –40°C to +125°C.

Features

•

2.7 to 5.5V supply voltage

•

1MHz PWM mode

•

Output current to 3A

•

>90% efficiency

•

Adjustable output voltage option down to 1V

•

Ultra-fast transient response

•

External Compensation

•

Stable with a wide range of output

capacitance

•

Fully integrated 5A MOSFET switch

•

Micropower shutdown

•

Thermal shutdown and current limit

protection

•

Pb-free 3mm x 3mm MLF-10L package

•

–40

°C to +125°C junction temperature range

•

Internal soft-start

Applications

•

5V or 3.3V Point of Load Conversion

•

Telecom/Networking Equipment

•

Set Top Boxes

•

Storage Equipment

•

Video Cards

Typical Application

MIC2208

3A 1MHz Buck Regulator

MLF and MicroLeadFrame are trademarks of Amkor Technology

Micrel, Inc • 2180 Fortune Drive • San Jose, Ca 95131 • USA • tel +1 (408) 944-0800 • fax +1 (408) 474-1000 • http://www.micrel.com

September 2005

M9999-092905

www.micrel.com