August 2003

1

MIC37150/37151/37152

MIC37150/37151/37152

Micrel

MIC37150/37151/37152

1.5A, Low Voltage

General Description

The Micrel MIC37150/51/52 is a 1.5A low-dropout linear

voltage regulator that provides a low voltage, high current

output with a minimum of external components. It offers high

precision, ultra-low dropout (500mV over temperature), and

low ground current.

The MIC37150/51/52 operates from an input of 2.25V to

6.0V. It is designed to drive digital circuits requiring low

voltage at high currents (i.e., PLDs, DSPs, microcontrollers,

etc.). It is available in fixed and adjustable output voltages.

Fixed voltages include 1.5V, 1.65V, 1.8V, 2.5V and 3.3V. The

adjustable version is capable of supplying output voltages

from 1.24V to 5.5V.

Features of the MIC37150/51/52 LDO include thermal and

current limit protection, and reverse current and reverse

battery protection. Logic enable and error flag pins are

available.

Junction temperature range of the MIC37150/51/52 is from

–40°C to 125°C.

For applications requiring input voltage greater than 6.0V,

see MIC3910x, MIC3915x, MIC3930x, and MIC3950x LDOs.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Typical Application

VOUT

VIN

FLG

GND

VEN

47µF, Ceramic

100k

MIC37151

Fixed 2.5V Regulator with Error Flag

VOUT

VIN

ADJ

GND

VEN

47µF, Ceramic

R1

R2

1.3V

MIC37152

Adjustable Regulator

Features

• 1.5A minimum guaranteed output current

• 500mV maximum dropout voltage over temperature

Ideal for 3.0V to 2.5V conversion

Ideal for 2.5V to 1.8V, 1.65V, or 1.5V conversion

• Stable with ceramic or tantalum capacitor

•Wide input voltage range:

V

2.25V to 6.0V

• +1.0% initial output tolerance

• Fixed and adjustable output voltages

MIC37150—3-pin fixed voltages

MIC37151—5-pin fixed voltages

MIC37152—5-pin adjustable voltage

• Excellent line and load regulation specifications

• Logic controlled shutdown

• Thermal shutdown and current limit protection

• Reverse-leakage protection

• Low profile S-Pak 3 or 5 pin packages

Applications

• LDO linear regulator for low-voltage digital IC

• PC add-in cards

• High efficiency linear power supplies

• SMPS post regulator

• Battery charger

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

Super ßeta PNP is a trademark of Micrel, Inc.