MIC5225

Ultra-Low Quiescent Current

150mA µCap Low Dropout Regulator

IttyBitty is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

July 2008

M9999-072908-A

General Description

The MIC5225 is a 150mA highly accurate, low dropout

regulator with high input voltage and ultra-low ground

current. This combination of high voltage and low ground

current makes the MIC5225 ideal for a wide variety of

applications including USB and portable electronics

applications, using 1-cell, 2-cell or 3-cell Li-Ion battery

inputs.

A µCap LDO design, the MIC5225 is stable with either a

ceramic or tantalum output capacitor. It only requires a

2.2µF capacitor for stability.

Features of the MIC5225 includes enable input, thermal

shutdown, current limit, reverse battery protection, and

reverse leakage protection.

Available in fixed and adjustable output voltage versions,

the MIC5225 is offered in the IttyBitty

with a junction temperature range of –40°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Features

• Wide input voltage range: 2.3V to 16V

• High output accuracy of ±2.0% over temperature

• Guaranteed 150mA output

• Very low ground current: 29µA

• Low dropout voltage of 310mV at 150mA

• µCap: Stable with ceramic or tantalum capacitors

• Excellent line and load regulation specifications

• Reverse battery protection

• Reverse leakage protection

• Zero shutdown current

• Thermal shutdown and current limit protection

Applications

• Cellular phones

• Keep alive supply in notebook and portable computers

• Battery-powered equipment

• Consumer/personal electronics

• High-efficiency linear power supplies

• Automotive electronics

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Typical Application

15

2

34

ceramic

EN

MIC5225YM5

OFF ON

Ultra-Low Current Adjustable Regulator Application

20

22

24

26

28

30

32

34

36

38

40

4

6

8

10

12

14

16

INPUT VOLTAGE (V)

Ground Pin Current

vs. Input Voltage