MIC24051

12V, 6A High-Efficiency Buck Regulator

SuperSwitcher II



HyperLight Load is a registered trademark of Micrel, Inc.

Hyper Speed Control, SuperSwitcher II, and Any Capacitor are trademarks of Micrel, 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

November 2012

M9999-112612-A

General Description

The Micrel MIC24051 is a constant-frequency, synchronous

buck regulator featuring a unique adaptive on-time control

architecture. The MIC24051 operates over an input supply

range of 4.5V to 19V and provides a regulated output of up to

6A of output current. The output voltage is adjustable down to

0.8V with a guaranteed accuracy of ±1%, and the device

operates at a switching frequency of 600kHz.

Micrel’s Hyper Speed Control

 architecture allows for ultra-

fast transient response while reducing the output capacitance

advantages of fixed-frequency operation and fast transient

response in a single device.

The MIC24051 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, foldback current limit, “hiccup mode” short-

circuit protection and thermal shutdown. An open-drain

Power Good (PG) pin is provided.

The 6A HyperLight Load

on Micrel’s web site.

All support documentation can be found on Micrel’s web

site at: www.micrel.com.

Features

•

Hyper Speed Control architecture enables

-

-

Small output capacitance

•

4.5V to 19V voltage input

•

6A output current capability, up to 95% efficiency

•

Adjustable output from 0.8V to 5.5V

•

±1% feedback accuracy

•

Any Capacitor

 stable - zero-to-high ESR

•

600kHz switching frequency

•

No external compensation

•

Power Good (PG) output

•

Foldback current-limit and “hiccup mode” short-circuit

protection

•

Supports safe start-up into a pre-biased load

•

–40

°C to +125°C junction temperature range

•

Available in 28-pin 5mm

× 6mm QFN package

Applications

•

Servers and work stations

•

Routers, switches, and telecom equipment

•

Base stations

_________________________________________________________________________________________________________________________

Typical Application

Efficiency (VIN = 12V)

vs. Output Current

50

55

60

65

70

75

80

85

90

95

100

0

1

2

3

4

5

6

7

8

OUTPUT CURRENT (A)

5.0V

3.3V

2.5V

1.8V

1.5V

1.2V

1.0V

0.9V

0.8V