July 2005

1

MIC5236

MIC5236

Micrel, Inc.

MIC5236

Low Quiescent Current µCap LDO Regulator

General Description

The MIC5236 is a low quiescent current, µCap low-dropout

regulator. With a maximum operating input voltage of 30V and

a quiescent current of 20µA, it is ideal for supplying keep-alive

power in systems with high-voltage batteries.

Capable of 150mA output, the MIC5236 has a dropout volt-

age of only 300mV. It can also survive an input transient of

–20V to +60V.

As a µCap LDO, the MIC5236 is stable with either a ceramic

or a tantalum output capacitor. It only requires a 1.0µF output

capacitor for stability.

The MIC5236 includes a logic compatible enable input and

an undervoltage error flag indicator. Other features of the

MIC5236includethermalshutdown,current-limit,overvoltage

shutdown,load-dumpprotection,reverseleakageprotections,

and reverse battery protection.

AvailableinthethermallyenhancedSOIC-8andMSOP-8,the

MIC5236comesinfixed2.5V,3.0V,3.3V,5.0V,andadjustable

voltages. For other output voltages, contact Micrel.

Typical Application

3.0V/100µA

30V

IN

MIC5236

EN

OUT

GND

ERR

Features

• Wide input range: 2.3V to 30V

• Low dropout:

230mV @50mA;

300mV @150mA

• Fixed 2.5V, 3.0V, 3.3V, 5.0V, and Adjustable outputs

• ±1.0% initial output accuracy

• Stable with ceramic or tantalum output capacitor

• Load dump protection: –20V to +60V input transient

survivability

• Logic compatible enable input

• Low output flag indicator

• Overcurrent protection

• Thermal shutdown

• Reverse-leakage protection

• Reverse-battery protection

• High-power SOIC-8 and MSOP-8

Applications

• Keep-alive supply in notebook and

portable personal computers

• Logic supply from high-voltage batteries

• Automotive electronics

• Battery-powered systems

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

3.0V/150mA

5V

IN

MIC5236

EN

47k

OUT

GND

ERR

Regulator with Error Output

3.0V/150mA

5V

IN

R1

R2

MIC5236

EN

OUT

GND

ADJ

Regulator with Adjustable Output