March 2000

1

MIC29150/29300/29500/29750

MIC29150/29300/29500/29750

Micrel

MIC29150/29300/29500/29750 Series

High-Current Low-Dropout Regulators

General Description

The MIC29150/29300/29500/29750 are high current, high

accuracy, low-dropout voltage regulators. Using Micrel's

proprietary Super ßeta PNP™ process with a PNP pass

element, these regulators feature 300mV to 370mV (full load)

dropout voltages and very low ground current. Designed for

high current loads, these devices also find applications in

lower current, extremely low dropout-critical systems, where

their tiny dropout voltage and ground current values are

important attributes.

The MIC29150/29300/29500/29750 are fully protected against

overcurrent faults, reversed input polarity, reversed lead

insertion, overtemperature operation, and positive and nega-

tive transient voltage spikes. Five pin fixed voltage versions

feature logic level ON/OFF control and an error flag which

signals whenever the output falls out of regulation. Flagged

states include low input voltage (dropout), output current

limit, overtemperature shutdown, and extremely high voltage

spikes on the input.

On the MIC29xx1 and MIC29xx2, the ENABLE pin may be

tied to V

MIC29150/29300/29500 are available in 3- and 5-pin TO-220

and surface mount TO-263 packages. The MIC29750 7.5A

regulators are available in 3- and 5-pin TO-247 packages.

Features

• High Current Capability

MIC29150/29151/29152/29153 ................................ 1.5A

MIC29300/29301/29302/29303 ................................... 3A

MIC29500/29501/29502/29503 ................................... 5A

MIC29750/29751/29752 ........................................... 7.5A

• Low-Dropout Voltage ....................... 350mV at Full Load

• Low Ground Current

• Accurate 1% Guaranteed Tolerance

• Extremely Fast Transient Response

• Reverse-battery and “Load Dump” Protection

• Zero-Current Shutdown Mode (5-Pin versions)

• Error Flag Signals Output Out-of-Regulation

(5-Pin versions)

• Also Characterized For Smaller Loads With Industry-

Leading Performance Specifications

• Fixed Voltage and Adjustable Versions

Applications

• Battery Powered Equipment

• High-Efficiency “Green” Computer Systems

• Automotive Electronics

• High-Efficiency Linear Power Supplies

• High-Efficiency Post-Regulator For Switching Supply

MIC29150/29300/29500/29750 Three Terminal

Devices:

Pin 1 = Input, 2 = Ground, 3 = Output

MIC29151/29301/29501/29751 Five Terminal

Fixed Voltage Devices:

Pin 1 = Enable, 2 = Input, 3 = Ground, 4 = Output,

5 = Flag

MIC29152/29302/29502/29752 Adjustable with

ON/OFF Control

Pin 1 = Enable, 2 = Input, 3 = Ground, 4 = Output,

5 = Adjust

MIC29153/29303/29503 Adjustable with Flag

Pin 1 = Flag, 2 = Input, 3 = Ground, 4 = Output,

5 = Adjust

1 2 3

1 2 3 4 5

MIC29151/29152/29153BT

MIC29301/29302/29303BT

MIC29501/29502/29503BT

MIC29751/29752BWT

MIC29150/29300/

29500BT and

MIC29750BWT

Pin Configuration

1 2 3

MIC29150/29300BU

MIC29151/29152/29153BU

MIC29301/29302/29303BU

MIC29501/29502/29503BU

1 2 3 4 5

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