MIC39300/39301/39302

3A, Low-Voltage Low-Dropout Regulator

**See Thermal Load Current Section

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

StrongARM is a trademark of Advanced RISC Machines, Ltd

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

General Description

The MIC39300, MIC39301 and MIC39302 are 3.0A low-

dropout linear voltage regulators that provide a low

voltage, high-current output with a minimum of external

components. Utilizing Micrel’s proprietary Super βeta

PNP

low dropout (typically 385mV at 3.0A) and low ground

current (typically 36mA at 3.0A).

The MIC39300/1/2 is ideal for PC add-in cards that need

to convert from standard 3.3V to 2.5V or 2.5V to 1.8V. A

guaranteed maximum dropout voltage of 500mV over all

operating conditions allows the MIC39300/1/2 to provide

2.5V from a supply as low as 3V, and 1.8V from a supply

as low as 2.5V. The MIC39300/1/2 also has fast transient

response for heavy switching applications. The device

requires only 47µF of output capacitance to maintain

stability and achieve fast transient response.

The MIC39300/1/2 is fully protected with overcurrent

limiting, thermal shutdown, reversed-battery protection,

reversed-leakage protection, and reversed-lead insertion.

The MIC39301 offers a TTL-logic compatible enable pin

and an error flag that indicates under voltage and over

current conditions. Offered in fixed voltages, the

MIC39300/1 comes in the TO-220 and TO-263 (D

packages and is an ideal upgrade to older, NPN-based

linear voltage regulators. The MIC39302 adjustable option

allows programming the output voltage anywhere between

1.24V and 15.5V and is offered in a 5-Pin, TO-263 (D

package.

Features

• 3.0A minimum guaranteed output current

• 550mV maximum dropout voltage over temperature

• Ideal for 3.0V to 2.5V conversion

• Ideal for 2.5V to 1.8V conversion

• 1% initial accuracy

• Low ground current

• Current limiting and Thermal shutdown

• Reversed-battery protection

• Reversed-leakage protection

• Fast transient response

• TTL/CMOS compatible enable pin (MIC39301/2 only)

• Error flag output (MIC39301 only)

• Adjustable output (MIC39302 only)

Applications

• LDO linear regulator for PC add-in cards

• High-efficiency linear power supplies

• SMPS post regulator

• Multimedia and PC processor supplies

• Low-voltage microcontrollers

• StrongARM™ processor supply

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Typical Application

MIC39300

MIC39301

MIC39302 Adjustable Output Application

(*See Minimum Load Current Section)