January 2010

1

M9999-011310

Micrel, Inc.

MIC2199

MIC2199

300kHz 4mm × 4mm Synchronous Buck Converter

General Description

The MIC2199 is a high-power 300kHz synchronous buck

DC-to-DC controller housed in a small 4mm×4mm MLF™

12-pin package. The MIC2199 operates from a wide 4.5V

to 32V input and can be programmed for output voltages

from 0.8V to 6V. The wide input voltage capability makes

the MIC2199 an ideal solution for point-of-load DC-to-DC

conversion in 5V, 12V, 24V, and 28V systems.

The 300kHz switching frequency allows the use of a small

inductor and small output capacitors.The current mode PWM

control along with the external COMP pin allows for ease of

stability compensation and fast transient response across a

wide range of applications.

An all N-Channel synchronous architecture and powerful

output drivers allow up to 20A of output current capability.

For smaller external components, refer to the 500kHz

MIC2198.

The MIC2199 is available in a 12-pin 4mm×4mm MLF™

package with a junction temperature range from –40°C to

125°C.

Features

• 4.5Vto32Vinputrange

• 4mm×4mm MLF™ package

• 300kHzPWMoperation

• 95%efficiency

• Outputvoltageadjustabledownto0.8V

• 20Aoutputcurrentcapability

• DrivesallN-ChannelMOSFETs

• Logiccontrolledmicropowershutdown

• Cycle-by-cyclecurrentlimiting

• Adjustableundervoltagelockout

• Frequencyfoldbackovercurrentprotection

Applications

• Point-of-loadDC-to-DCconversionfrom5V,12V,

24V, 28V supplies

• Telecomequipment

• Wirelessmodems

• Servers

• Basestations

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

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

Typical Application

IRF7821

IRF7821

2µH

0.01Ω

3.3V/7A

10kΩ

6.04kΩ

1nF

4.5V to 24V

VIN

EN/UVLO

COMP

CSH

LSD

VSW

VDD

BST

HSD

GND

VOUT

FB

2.2nF

2kΩ

U1 MIC2199BML

SD103BWS

0.1µF

22

µF

4.7µF

220µF

4.5V–24V to 3.3V/7A Converter

85.0

90.0

95.0

100.0

0

2

4

6

8

Efficiency for