January 2000

1

MIC5237

MIC5237

Micrel

Typical Application

MIC5237

500mA Low-Dropout Regulator

Preliminary Information

General Description

The MIC5237 is a general-purpose low-dropout regulator

capable of 500mA output current with better than 3% output

voltage accuracy. Using Micrel’s proprietary Super

ßeta PNP™ process with a PNP pass element, these regu-

lators feature less than 300mV dropout voltage and typically

8mA ground current at full load.

Designed for applications that require moderate current over

a broad input voltage range, including hand-held and battery-

powered devices, the MIC5237 is intended for applications

that can tolerate moderate voltage drop at higher current.

Key features include low ground current to help prolong

battery life, reversed-battery protection, current limiting, over-

temperature shutdown, and thermally efficient packaging.

The MIC5237 is available in fixed output voltages only.

For space-critical applications and improved performance,

see the MIC5209 and MIC5219. For output current require-

ments up to 750mA, see the MIC2937.

Features

• Guaranteed 500mA output over the full operating

temperature range

• Low 300mV typical dropout voltage at full load

• Extremely tight load and line regulation

• Current and thermal limiting

• Reversed-battery protection

• TO-220 and TO-263 packages

• Low temperature coefficient

• No-load stability

• Low-noise output

Applications

• Portable and laptop computers

• Desktop computer

• Battery chargers

• SMPS post-regulator/dc-to-dc modules

• Consumer and personal electronics

Ordering Information

Part Number

Voltage

Junct. Temp. Range

Package

MIC5237-2.5BT

2.5V

–40

°C to +125°C

TO-220

MIC5237-2.5BU

2.5V

–40

°C to +125°C

TO-263

MIC5237-3.3BT

3.3V

–40

°C to +125°C

TO-220

MIC5237-3.3BU

3.3V

–40

°C to +125°C

TO-263

MIC5237-5.0BT

5.0V

–40

°C to +125°C

TO-220

MIC5237-5.0BU

5.0V

–40

°C to +125°C

TO-263

MIC5237-5.0

IN

OUT

GND

1.0µF

1.0µF

tantalum

≥5.6V

5.0V

±3%

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