MIC2207

3mmx3mm 2MHz 3A PWM Buck

Regulator

General Description

The Micrel MIC2207 is a high efficiency PWM buck

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

output current. The MIC2207 operates at 2MHz and

has proprietary internal compensation that allows a

closed loop bandwidth of over 200KHz.

The low on-resistance internal p-channel MOSFET

of the MIC2207 allows efficiencies over 94%,

reduces external components count and eliminates

the need for an expensive current sense resistor.

The MIC2207 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 MIC2207 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

•

2MHz PWM mode

•

Output current to 3A

•

>94% efficiency

•

100% maximum duty cycle

•

Adjustable output voltage option down to 1V

•

Ultra-fast transient response

•

Ultra-small external components

Stable with a 1µH inductor and a 4.7µF

output capacitor

•

Fully integrated 3A MOSFET switch

•

Micropower shutdown

•

Thermal shutdown and current limit

protection

•

Pb-free 3mm x 3mm MLF-12L package

•

–40

°C to +125°C junction temperature range

Applications

•

5V or 3.3V Point of Load Conversion

•

Telecom/Networking Equipment

•

Set Top Boxes

•

Storage Equipment

•

Video Cards

____________________________________________________________________________________________________

Typical Application

MIC2207

3A 2MHz Buck Regulator

80

82

84

86

88

90

92

94

96

00.5

11.522.5

3

OUTPUT CURRENT (A)

MIC2207

3.3V

OUT

Efficiency

4.5V

IN

5V

IN

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

April 2005

M9999-040705

www.micrel.com