MIC3775

750mA µCap Low-Voltage

Low-Dropout Regulator

PowerPC is a trademark of IBM Corp.

Super βeta PNP is a registered trademark of Micrel, Inc.

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

December 2006

1

M9999-121906

General Description

The MIC3775 is a 750mA low-dropout linear voltage

regulators that provides low-voltage, high-current output

from an extremely small package. Utilizing Micrel’s

proprietary Superβeta PNP

offers extremely low-dropout (typically 280mV at 750mA)

and low ground current (typically 7.5mA at 750mA).

The MIC3775 is ideal for PC add-in cards that need to

convert from standard 5V to 3.3V or 3.0V, 3.3V to 2.5V or

2.5V to 1.8Vor 1.65V. A guaranteed maximum dropout

voltage of 500mV over all operating conditions allows the

MIC3775 to provide 2.5V from a supply as low as 3.0V and

1.8V or 1.5V from a supply as low as 2.25V.

The MIC3775 is fully protected with overcurrent limiting,

thermal shutdown, and reversed-leakage protection. Fixed

and adjustable output voltage options are available with an

operating temperature range of –40°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• Fixed and adjustable output voltages to 1.24V

• 280mV typical dropout at 750mA

–

Ideal for 3.0V to 2.5V conversion

–

Ideal for 2.5V to 1.8V or 1.65V conversion

• Stable with ceramic capacitor

• 750mA minimum guaranteed output current

• 1% initial accuracy

• Low ground current

• Current limiting and thermal shutdown

• Reversed-leakage protection

• Fast transient response

• Low-profile power MSOP-8 package

Applications

• Fiber optic modules

• LDO linear regulator for PC add-in cards

• PowerPC™ power supplies

• High-efficiency linear power supplies

• SMPS post regulator

• Multimedia and PC processor supplies

• Battery chargers

• Low-voltage microcontrollers and digital logic

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Typical Application

1.25V/750mA Adjustable Regulator