MP2905

3V-28V Input, Hysteretic

Synchronous Step-Down Controller

MP2905 Rev. 0.91

www.monolithicpower.com

1

4/18/2011

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The Future of Analog IC Technology

DESCRIPTION

The MP2905 is a hysteretic voltage-mode control,

synchronous PWM buck controller. The output

voltage can be regulated from 0.6V to 0.9*VIN. It

achieves high output current over a wide input

supply range from 3V-28V.

MP2905 integrates an internal LDO regulator that

makes the controller function at a wide input

supply.

Hysteretic voltage-mode control provides fast

transient

response

without

additional

loop

compensation.

An adjustable soft-start prevents inrush current at

turn-on. The device senses high-side switch

voltage drop for hiccup current limit and short

current protection. The frequency is adjustable

from 200kHz to 500kHz.

The MP2905 is available in 10-pin MSOP

package, provides a very compact system

solution with minimal reliance on external

components.

FEATURES

• Wide 3V to 28V Operating Input Range

• Output Adjustable from 0.6V to 0.9*Vin

• Switching frequency from 200kHz to 500kHz

• Programmable Soft-Start

• Hiccup current limit

• Lossless peak current sensing

• MSOP-10 package

APPLICATIONS

• Motherboard Power Supplies

• AGP and PCI-Express Power Supplies

• Graphic-Card Power Supplies

• Set-Top Boxes

• Point-of-Load Power Supplies

TYPICAL APPLICATION