MIC2150/MIC2151

2-Phase Dual Output PWM Synchronous

Buck Control IC

MicroLead Frame and MLF are registered trademarks of Amkor Technology, 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

General Description

The

MIC2150/1

are

simple

2-phase

dual-output

synchronous buck control ICs featuring small size and high

efficiency. The ICs implement PWM control at 500kHz

(MIC2150) or 300kHz (MIC2151), with the outputs

switching 180

° out of phase. The result of the out-of-phase

operation is 1MHz input ripple frequency with ripple current

cancellation,

minimizing

the

required

input

filter

capacitance. A 1% output voltage tolerance allows the

maximum level of system performance. Internal drivers

with adaptive gate drive allow the highest efficiency with

the minimum external components.

A dual threshold enable pin, matched soft-start pins, and a

power good output are provided, allowing a high level of

control.

The MIC2150/1 are available in the small size 4mm×4mm

24-pin MLF

operating range from –40

°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Applications

• Multi-output power supplies with sequencing

• DSP, FPGA, CPU and ASIC power supplies

• Telecom and Networking equipment

• Servers

Features

• Dual Synchronous Buck Control IC with outputs

switching 180 degree out-of-phase

• 4.5V to 14.5V input voltage range

• Adjustable output voltages down to 0.7V

• 1% output voltage accuracy

• MIC2150: 500kHz PWM operation

• MIC2151: 300kHz PWM operation

• Adaptive gate drive allows efficiencies over 95%

• Adjustable current limit with no sense resistor

-

Senses low-side MOSFET current

• Internal drivers allow 20A per phase

• Power Good output allow simple sequencing

• Dual threshold enable pin

• Independent programmable soft-start pins

• Output over-voltage protection

• Input UVLO

• Works with ceramic output capacitors

• Junction temperature range of -40°C to +125°C

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Typical Application

August 2009

M9999-082809-A

(408) 944-0800