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MIC2164

Synchronous Buck Controllers Featuring Adaptive On-Time Control 28V Input, Constant Frequency

Micrel 

MIC2164/-2/-3/C

Synchronous Buck Controllers

Featuring Adaptive On-Time Control

28V Input, Constant Frequency

Hyper Speed Control™ Family

General Description

Features

The Micrel MIC2164/-2/-3/C are constant-frequency,

synchronous buck controllers featuring adaptive on-time

control. The MIC2164/-2/-3/C are the first products in the new

Hyper Speed Control™ family of buck controllers introduced

by Micrel.

The MIC2164/-2/-3/C controllers operate over an input supply

range of 3V to 28V, and are independent of the IC supply

voltage. The devices are capable of supplying 25A output

current. While the MIC2164 operates at 300kHz, the

MIC2164-2 operates at 600kHz, and the MIC2164-3 operates

at 1MHz.

A unique Hyper Speed Control™ architecture allows for ultra-

fast transient response while reducing the output capacitance

and also makes High VIN/Low VOUT operation possible. The

MIC2164/-2/-3/C controllers utilizes an architecture which is

adaptive TON ripple controlled. A UVLO feature is provided to

ensure proper operation under power-sag conditions to

prevent the external power MOSFET from overheating. A soft

start feature is provided to reduce the inrush current.

Foldback current limit and “hiccup” mode short-circuit

protection ensure FET and load protection.

• Hyper Speed Control™ architecture enables

- High delta V operation (VHSD = 28V and VOUT = 0.8V)

- Smaller output capacitors than competitors

• 3V to 28V input voltage

• Any CapacitorTM stable

- Zero ESR to high ESR

• 25A output current capability

• 300kHz/600kHz/1MHz switching frequency

• Adaptive on-time mode control

• Adjustable output from 0.8V to 5.5V with ±1%

(MIC2164/-2/-3) or ±3% (MIC2164C) FB accuracy

• Up to 95% efficiency

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

protection

• 6ms Internal soft start

• Thermal shutdown

• Safe start-up into pre-biased loads

• –40°C to +125°C junction temperature range

• Available in 10-pin MSOP package

The MIC2164/-2/-3/C controllers are available in a 10-pin

MSOP (MAX1954A-compatible) package with a junction

operating range from –40°C to +125°C.

All support documentation can be found on Micrel’s web site

at: www.micrel.com.

Applications

• Set-top box, gateways and routers

• Printers, scanners, graphic cards and video cards

• Telecommunication, PCs and servers

________________________________________________________________________________________________________________________

Typical Application

MIC2164/-2/-3/C Synchronous Controllers Featuring Adaptive On-Time Control

100

95

90

85

80

75

70

65

60

55

50

0

MIC2164

12V to 3.3V Efficiency

VIN=5V

4

8

12

16

20

OUTPUT CURRENT (A)

Hyper Speed Control and Any Capacitor is a trademark 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

September 2010

M9999-091310-D

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