MIC2176-1/-2/-3

Wide Input Voltage, Synchronous Buck

Controllers Featuring Adaptive On-Time

Control

Hyper Speed Control™ Family

Hype

MLF and

4-0800 • fax + 1 (

r Speed Control, SuperSwitcher II and Any Capacitor are trademarks of Micrel, Inc.

Micro

LeadFrame are registered trademarks of Amkor Technology, Inc.

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

Novem

M9999-111710-A

ber 2010

General Description

The Micrel MIC2176-1/-2/-3 is a family of constant-frequency,

synchronous buck controllers featuring a unique digitally

modified adaptive ON-time control architecture. The MIC2176

family operates over an input supply range of 4.5V to 75V

and can be used to supply up to 15A of output current. The

output voltage is adjustable down to 0.8V with a guaranteed

accuracy of ±1%, and the device operates at a constant

switching frequency of 100kHz, 200kHz, and 300kHz.

Micrel’s Hyper Speed Control

fast transient response while reducing the output capacitance

combines the advantages of fixed-frequency operation and

fast transient response in a single device.

The MIC2176 offers a full suite of protection features to

ensure protection of the IC during fault conditions. These

include undervoltage lockout to ensure proper operation

under power-sag conditions, internal soft-start to reduce

inrush current, fold-back current limit, “hiccup” mode short-

circuit protection and thermal shutdown.

All support documentation can be found on Micrel’s web

site at: www.micrel.com.

Features

•

Hyper Speed Control

-

-

Small output capacitance

•

4.5V to 75V input voltage

•

Output down to 0.8V with ±1% accuracy

•

Any Capacitor

-

Zero-ESR to high-ESR output capacitance

•

100kHz/200kHz/300kHz switching frequency

•

Internal compensation

•

6ms Internal soft-start

•

Foldback current limit and “hiccup” mode short-circuit

protection

•

Thermal shutdown

•

Supports safe start-up into a pre-biased output

•

–40

°C to +125°C junction temperature range

•

Available in 10-pin MSOP package

Applications

•

Distributed power systems

•

Networking/Telecom Infrastructure

•

Printers, scanners, graphic cards and video cards

___________________________________________________________________________________________________________

Typical Application

MIC2176-2 Adjustable Output 200KHz Buck Converter

Efficiency

vs. Output Current

40

45

50

55

60

65

70

75

80

85

90

95

0

12

345

OUTPUT CURRENT (A)

MIC2176-2