MIC2168A

1MHz PWM Synchronous Buck-Control IC

General Description

The MIC2168A is a high-efficiency, simple to use 1MHz

PWM synchronous buck-control IC housed in a small

MSOP-10 package.

The

MIC2168A

allows

compact

DC/DC solutions with a minimal external component count

and cost.

The MIC2168A operates from a 3V to 14.5V input, without

the need of any additional bias voltage. The output voltage

can be precisely regulated down to 0.8V. The adaptive all

N-Channel MOSFET drive scheme allows efficiencies over

95% across a wide load range.

The MIC2168A senses current across the high-side N-

Channel MOSFET, eliminating the need for an expensive

and lossy current-sense resistor. Current limit accuracy is

maintained by a positive temperature coefficient that tracks

cost and space are saved by the internal in-rush-current

limiting and digital soft-start.

The MIC2168A is identical to the MIC2168 with the

exception that the MIC2168A increases the overcurrent

blanking time from 80ns (typ.) to 120ns (typ.)

The MIC2168A is available in a 10-pin MSOP package,

with a wide junction operating range of –40°C to +125°C.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• 3V to 14.5V input voltage range

• Adjustable output voltage down to 0.8V

• Up to 95% efficiency

• 1MHz PWM operation

• Adjustable current-limit senses high-side N-Channel

MOSFET current

• No external current sense resistor

• Adaptive gate drive increases efficiency

• Ultra-fast response with hysteretic transient recovery

mode

• Overvoltage protection protects the load in fault

conditions

• Dual mode current limit speeds up recovery time

• Hiccup mode short-circuit protection

• Internal soft-start

• Small-size MSOP 10-pin package

Applications

• Point-of-load DC/DC conversion

• Set-top boxes

• Graphic cards

• LCD power supplies

• Telecom power supplies

• Networking power supplies

• Cable modems and routers

Typical Application

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 22, 2015

Revision 3.0