1A Low-Voltage Low-Dropout Regulator

LM39100/39101/39102

FEATURES

•Fixed and adjustable output voltages to 1.24V

•410mV typical dropout at 1A

Ideal for 3.0V to 2.5V conversion

Ideal for 2.5V to 1.8V or 1.5V conversion

•1A minimum guaranteed output current

LM39100-X.X Fixed

•1% initial accuracy

•Low ground current

•Current limiting and thermal shutdown

•Reversed-battery protection

•Reversed-leakage protection

•Fast transient response

•Low-profile SOT-223 package

APPLICATIONS

•LDO linear regulator for PC add-in cards

•PowerPC™ power supplies

•High-efficiency linear power supplies

•SMPS post regulator

•Multimedia and PC processor supplies

•Battery chargers

•Low-voltage microcontrollers and digital logic

ORDERING INFORMATION

DESCRIPTION

HTC

Connect to resitive voltage-divider network

Ground

Device

Marking

Package

PIN DESCRIPTION

Enable

(Input)

IN

CMOS-compatible control input.

Logic high = enable, logic

OUT

FLG

Regulator Output

LM39100-X.X

ADJ

GND

Adjustment Input: Feedback input.

Connect to resitive voltage-divider network

LM39101-X.X

LM39102-Adj

1

LM39100- X.X

SOT-223

Logic low or open = shutdown

Supply (Input)

Flag (Output): Open-collector error flag output.

LM39101-X.X

SOP-8

LM39102-Adj

SOP-8

SOT-223

SOP-8

* X.X = Fixed Vout = 1.5V, 1.8V, 2.5V, 3.3V, 5.0V

The LM39100, LM39101, and LM39102 are 1A low-dropout linear voltage regulators that provide low-

voltage,high-current output from an extremely small package.

The LM39100/1/2 offers extremely low dropout (typically 410mVat 1A) and low ground current (typically

12mA at 1A).

The LM39100 is a fixed output regulator offered in theSOT-223 package. The LM39101 and LM39102 are

fixedand adjustable regulators, respectively, in a thermally en-hanced power 8-lead SOP (small outline

package).

The LM39100/1/2 is ideal for PC add-in cards that need toconvert from standard 5V to 3.3V, 3.3V to 2.5V

or 2.5V to1.8V. A guaranteed maximum dropout voltage of 630mV overall operating conditions allows the

LM39100/1/2 to provide2.5V from a supply as low as 3.13V and 1.8V from a supplyas low as 2.43V.

The LM39100/1/2 is fully protected with over current limiting,thermal shutdown, and reversed-battery

protection. Fixed voltages of 5.0V, 3.3V, 2.5V,1.8V and 1.5V are available on LM39100/1 with adjustable

output voltages to 1.24V on LM39102.