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MIC37150

1.5A, Low Voltage µCap LDO Regulator

Micrel 

MIC37150/51/52/53

1.5A, Low Voltage µCap LDO Regulator

General Description

The Micrel MIC37150/51/52/53 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 MIC37150/51/52/53 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, micro-

controllers, 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 MIC37150/51/52/53 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 MIC37150/51/52/53 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.

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

– VIN: 2.25V to 6.0V

• ±1.0% initial output tolerance

• Fixed and adjustable output voltages

– MIC37150—3-pin fixed voltages

– MIC37151—5-pin S-Pak or 8-pin e-Pad SOIC

fixed voltages with flag

– MIC37152—5-pin adjustable voltage

– MIC37153—8-pin adjustable voltage with flag

• Excellent line and load regulation specifications

• Logic controlled shutdown

• Thermal shutdown and current limit protection

• Reverse-leakage protection

• Low profile 3 or 5-pin S-Pak packages or 8-pin e-Pad

SOIC

Applications

• LDO linear regulator for low-voltage digital IC

• PC add-in cards

• High efficiency linear power supplies

• SMPS post regulator

• Battery charger

Typical Application

VIN = 3.0V

CIN

MIC37151

VIN

VOUT

VEN

FLG

GND

100k

VOUT = 2.5V VIN

COUT

47µF, Ceramic

CIN

MIC37152

VIN

VOUT

R1

VEN

ADJ

GND

R2

1.3V

COUT

47µF, Ceramic

Fixed 2.5V Regulator with Error Flag

Adjustable Regulator

Super ßeta PNP is a trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

October 2007

M9999-101907

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