March 2003

1

MIC3775

MIC3775

Micrel

Ordering Information

Part Number

Voltage

Junction Temp. Range

Package

MIC3775-1.5BMM

1.5V

–40

°C to +125°C

MSOP-8

MIC3775-1.65BMM

1.65V

–40

°C to +125°C

MSOP-8

MIC3775-1.8BMM

1.8V

–40

°C to +125°C

MSOP-8

MIC3775-2.5BMM

2.5V

–40

°C to +125°C

MSOP-8

MIC3775-3.0BMM

3.0V

–40

°C to +125°C

MSOP-8

MIC3775-3.3BMM

3.3V

–40

°C to +125°C

MSOP-8

MIC3775BMM

Adj.

–40

°C to +125°C

MSOP-8

MIC3775

750mA

Final

General Description

The MIC3775 is a 750mA low-dropout linear voltage regula-

tors that provides low-voltage, high-current output from an

extremely small package. Utilizing Micrel’s proprietary

Super

βeta PNP™ pass element, the MIC3775 offers ex-

tremely 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 1.8V

or 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.

For other voltages, contact Micrel.

Typical Applications

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

Super

βeta PNP is a trademark of Micrel, Inc.

PowerPC is a trademark of Motorola

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

IN

R1

1.25V

2.5V

10

µF

ceramic

R2

EN

OUT

ADJ

GND

MIC3775BMM

ENABLE

SHUTDOWN

1.25V/750mA Adjustable Regulator

0

50

100

150

200

250

300

0

0.25

0.5

0.75

OUTPUT CURRENT (A)

Dropout

vs. Output Current

1.8V

OUT

2.5V

OUT

3.3V

OUT