August 2003

1

MIC5238

MIC5238

Micrel

MIC5238

Ultra-Low Quiescent Current, 150mA

General Description

The MIC5238 is an ultra-low voltage output, 150mA LDO

regulator. Designed to operate in a single supply or dual

supply mode, the MIC5238 consumes only 23

µA of bias

current, improving efficiency. When operating in the dual

supply mode, the efficiency greatly improves as the higher

voltage supply is only required to supply the 23

µA bias

current while the output and base drive comes off of the much

lower input supply voltage.

As a

µCap regulator, the MIC5238 operates with a 2.2µF

ceramic capacitor on the output, offering a smaller overall

solution. It also incorporates a logic-level enable pin that

allows the MIC5238 to be put into a zero off-current mode

when disabled.

The MIC5238 is fully protected with current limit and thermal

shutdown. It is offered in the IttyBitty™ SOT-23-5 package

with an operating junction temperature range of

–40

°C to +125°C.

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

IttyBitty is a trademark of Micrel, Inc.

Features

• Ultra-low input voltage range: 1.5V to 6V

• Ultra-low output voltage: 1.1V minimum output voltage

• Low dropout voltage: 310mV at 150mA

• High output accuracy:

±2.0% over temperature

•

µCap: stable with ceramic or tantalum capacitors

• Excellent line and load regulation specifications

• Zero shutdown current

• Reverse leakage protection

• Thermal shutdown and current limit protection

• IttyBitty™ SOT-23-5 package

Applications

• PDAs and pocket PCs

• Cellular phones

• Battery powered systems

• Low power microprocessor power supplies

Typical Application

15

2

34

ceramic

EN

MIC5238-1.0BM5

1.0V

OFF ON

Ultra-Low Voltage Application

Ordering Information

Part Number

Marking

Voltage*

Junction Temp. Range

Package*

MIC5238-1.1BM5

L411

1.1V

–40

°C to +125°C

SOT-23-5

MIC5238-1.3BM5

L413

1.3V

–40

°C to +125°C

SOT-23-5

MIC5238-1.1BD5

N411

1.1V

–40

°C to +125°C

TSOT-23-5

MIC5238-1.3BD5

N413

1.3V

–40

°C to +125°C

TSOT-23-5

* For other voltages and package option contact the factory