MIC2159

SYNCHRONOUS-itty™ Step-Down

Converter IC

MLF and MicroLead Frame is a registered trademark of Amkor Technologies

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

October 2006

M9999-101206

General Description

The MIC2159 is a high efficiency, simple to use

synchronous buck controller ICs housed in a 10-pin MSOP

ePAD package. The MIC2159 switches at 400kHz,

allowing the smallest possible external components and is

designed to drive loads up to 30A. The devices feature

high output driver capability, combined with an all n-

channel synchronous architecture.

The MIC2159 operates from a 3V to 14.5V input and can

be configured to generate output voltages as low as 0.8V.

Efficiencies of over 95% can be achieved within the

smallest possible printed circuit board space area.

The MIC2159 is available in a thermally capable 10-pin

ePAD MSOP package, with an junction operating range

from –40

°C to +125°C.

Features

• Small footprint 10-lead ePAD MSOP

• 3V to 14.5V input voltage range

• Adjustable output voltage down to 0.8V

• 400KHz operation

• Drives two n-channel MOSFETs

-

Built-in 3

Ω drivers

• Simple control: voltage-mode PWM

• Fast transient response

-

Transient Hysteretic control

-

Externally compensated

• Over-current protection

• Hiccup mode short-circuit protection

• Dual function COMP & EN pin

-

• Short minimum ON time

-

30ns

-

Very low duty cycle possible

Applications

• Point-of-Load DC/DC conversion

• High Current Power Supplies

• Telecom/datacom and Networking Power Supplies

• Servers and Workstations

• Graphics Cards and other PC Peripherals

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Typical Application

MIC2159 Adjustable Output 400kHz Converter