Datasheet

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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 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

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

SOT23-5 package

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

• IttyBitty

SOT23-5 Package

Applications

• Cellular phones

• Keep alive supply in notebook and portable computers

• Battery-powered equipment

• Consumer/personal electronics

• High-efficiency linear power supplies

• Automotive electronics

_______________________________________________________________________________________________________

Typical Application

OUT

= 2.2µF

ceramic

GND

= 18µA

= 1.0µF

MIC5225YM5

OUT

= 1.8V

OFF

Ultra-Low Current Adjustable Regulator Application

4 6 8 10 12 14 16

INPUT VOLTAGE (V)

Ground Pin Current

vs. Input Voltage

OUT

= 10µA

OUT

= 1mA

OUT

= 100µA

Summary of content (9 pages)

PAGE 1
MIC5225 Ultra-Low Quiescent Current 150mA µCap Low Dropout Regulator General Description Features 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.
PAGE 2
Micrel, Inc. MIC5225 Ordering Information Part Number Marking* Voltage** Junction Temp. Range Package Lead Finish MIC5225-1.5YM5 QT15 1.5V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-1.8YM5 QT18 1.8V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-2.5YM5 QT25 2.5V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-2.7YM5 QT27 2.7V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-3.0YM5 QT30 3.0V –40° to +125°C 5-Pin SOT23 Pb-Free MIC5225-3.3YM5 QT33 3.
PAGE 3
Micrel, Inc. MIC5225 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VIN) .................................. ……–20V to 18V Enable Voltage (VEN)....................................... –0.3V to 18V Power Dissipation (PD) ..............................Internally Limited Junction Temperature (TJ) ........................–40°C to +125°C Storage Temperature (Ts) .........................–65°C to +150°C ESD ...........................................................................
PAGE 4
Micrel, Inc. MIC5225 Typical Characteristics Power Supply Rejection Ratio 70 350 60 300 50 250 40 200 30 150 20 100 10 0 0.01 0.1 1 10 100 FREQUENCY (Hz) 1000 Output Voltage vs. Input Voltage 3.5 3.0 2.5 ILOAD = 150mA 450 400 350 300 250 200 150 100 20 40 60 80 100 120 140 160 OUTPUT CURRENT (mA) Ground Pin Current vs. Output Current ILOAD = 75mA 2000 ILOAD = 150mA 32 30 500 0.5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 INPUT VOLTAGE (V) Ground Pin Current vs.
PAGE 5
Micrel, Inc. MIC5225 Typical Characteristics (continued) Input Current vs. Input Voltage 120 3.05 3.04 100 3.02 3.01 60 3.00 2.99 40 250 200 150 30 0 INPUT VOLTAGE (V) 10 -40°C 20 +25°C 10 +85°C 5 0 0 2 4 6 8 10 12 14 EXTERNAL VOLTAGE (V) MIC5225 IN OUT EN GND July 2008 IOUT = 100µA 2.95 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) Reverse Current (Open Input) 25 15 100 2.97 2.96 Reverse Current 30 REVERSE CURRENT (µA) 0 REVERSE CURRENT (µA) 300 2.
PAGE 6
Micrel, Inc. MIC5225 Functional Diagram OUT IN EN ENABLE 1.24V VREF GND Block Diagram – Fixed Output Voltage OUT IN EN ENABLE R1 1.
PAGE 7
Micrel, Inc. MIC5225 Thermal Consideration The MIC5225 is designed to provide 150mA of continuous current in a very small package. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part.
PAGE 8
Micrel, Inc. MIC5225 Adjustable Regulator Application The MIC5225YM5 can be adjusted from 1.24V to 14V by using two external resistors (Figure 1). The resistors set the output voltage based on the following equation: VOUT = VREF(1 + (R1/R2)), Where VREF = 1.24V. Feedback resistor R2 should be no larger than 300kΩ. VIN MIC5225YM5 IN OUT EN ADJ. VOUT R1 1.0µF GND 2.0µF R2 Figure 1.
PAGE 9
Micrel, Inc. MIC5225 Package Information 5-Pin SOT23 (M5) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.