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MIC39150

1.5A, Low-Voltage Low-Dropout Regulator

Micrel 

MIC39150/39151/39152

1.5A, Low-Voltage Low-Dropout

Regulator

General Description

The MIC39150, MIC39151, and MIC39152 are 1.5A LDO

voltage regulators that provide a low voltage, high current

output with a minimum of external components. Utilizing

Micrel’s proprietary Super βeta PNP® pass element, the

MIC39150/1/2 offers extremely low dropout (typically

375mV at 1.5A) and low ground current (typically 17mA at

1.5A).

The MIC39150/1/2 are ideal for PC add-in cards that need

to convert from 3.3V to 2.5V or 2.5V to 1.8V with a

guaranteed maximum dropout voltage of 500mV over all

operating conditions. The MIC39150/1/2 exhibit fast

transient response for heavy switching applications and

requires only 10µF of output capacitance to maintain

stability and achieve fast transient response.

The MIC39150/1/2 is fully protected with current limiting,

thermal shutdown, reversed-battery protection/lead

insertion, and reverse-leakage protection. The MIC39151

offers a TTL-logic compatible enable pin and an error flag

that indicates undervoltage and overcurrent conditions.

Offered in fixed voltages of 2.5V, 1.8V and 1.65V, the

MIC39150/1 comes in the TO-220 and TO-263 (D2Pak)

packages. The MIC39152 adjustable option allows

programming the output voltage anywhere between 1.24V

and 15.5V and comes in 5-Pin, TO-263 (D2Pak) and

TO-252 (D-Pak) packages.

For applications requiring input voltage greater than 16V or

automotive load dump protection, see the MIC29150/1/2/3

family.

Features

• 1.5A minimum guaranteed output current

• 500mV maximum dropout voltage over temperature

– Ideal for 3.0V to 2.5V conversion

– Ideal for 2.5 to 1.8V or 1.65V conversion

• 1% initial accuracy

• Low ground current

• Current limiting and Thermal shutdown

• Reversed-battery and reversed lead insertion protection

• Reversed-leakage protection

• Fast transient response

• TTL/CMOS compatible enable pin (MIC39151/2 only)

• Error flag output (MIC39151 only)

• Adjustable output (MIC39152 only)

• Power D-Pak package (TO-252) Adjustable only

• Power D2Pak package (TO-263)

Applications

• Low-voltage digital ICs

• LDO linear regulator for PC add-in cards

• High-efficiency linear power supplies

• SMPS post regulator

• Low-voltage microcontrollers

• StrongARM™ processor supply

Typical Application**

MIC39150

MIC39151

MIC39152 Adjustable Output Application

(*See Minimum Load Current Section)

Super ßeta PNP is a registered trademark of Micrel, Inc.

StrongARM is a trademark of Advanced RSIC Machines, Ltd.

**See Thermal Design Section

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

October 2009

M9999-102309-A

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