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MIC5239

Low Quiescent Current 500mA µCap LDO Regulator

Micrel 

MIC5239

Low Quiescent Current 500mA µCap

LDO Regulator

General Description

Features

The MIC5239 is a low quiescent current, µCap low-dropout

regulator. With a maximum operating input voltage of 30V

and a quiescent current of 23µA, it is ideal for supplying

keep-alive power in systems with high voltage batteries.

Capable of 500mA output, the MIC5239 has a dropout

voltage of only 350mV. It can provide high output current

for applications such as USB.

• Ultra-low quiescent current (IQ = 23µA @IO = 100µA)

• Continuous 500mA output current

• Wide input range: 2.3V to 30V

• Low dropout voltage: 350mV @500mA

• ±1.0% initial output accuracy

• Stable with ceramic or tantalum output capacitor

As a µCap LDO, the MIC5239 is stable with either a

ceramic or a tantalum output capacitor. It only requires a

3.3µF output capacitor for stability.

The MIC5239 includes a logic compatible enable input and

an undervoltage error flag indicator. Other features of the

MIC5239 include thermal shutdown, current limit, overvolt-

age shutdown, reverse-leakage protection, and reverse-

battery protection.

• Logic compatible enable input

• Low output voltage error flag indicator

• Overcurrent protection

• Thermal shutdown

• Reverse-leakage protection

• Reverse-battery protection

• High-power SOIC-8, MSOP-8 and SOT-223 packages

Available in the thermally enhanced SOIC-8, MSOP-8 and

SOT-223, the MIC5239 comes in fixed 1.5V, 1.8V, 2.5V,

3.0V, 3.3V and 5.0V, and adjustable voltages. For other

output voltages, contact Micrel.

All support documentation can be found on Micrel’s web

site at: www.micrel.com.

Applications

• USB power supply

• Keep-alive supply in notebook and portable personal

computers

• Logic supply from high voltage batteries

• Automotive electronics

• Battery-powered systems

___________________________________________________________________________________________________________

Typical Application

40

MIC5239

VIN

IN OUT

30V

EN FLG

GND

VOUT

3.0V/100µA

IGND = 23µA

35

IOUT = 1mA

30

IOUT = 100µA

25

20

15 IOUT = 10µA

Regulator with Low IO and Low IQ

10

4 9 14 19 24 29

Ground Current vs. Input Voltage

MLF and MicroLeadFrame is a registered trademark of Amkor Technologies

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

December 2007

M9999-121007

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