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PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright © 2001-2005, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

REG113

FEATURES

q CAP-FREE DMOS TOPOLOGY:

Ultra Low Dropout Voltage:

250mV typ at 400mA

Output Capacitor

q UP TO 500mA PEAK, TYPICAL

q FAST TRANSIENT RESPONSE

q VERY LOW NOISE: 28

q HIGH ACCURACY:

q HIGH EFFICIENCY:

q 2.5V, 2.85V, 3.0V, 3.3V, AND 5.0V OUTPUT VERSIONS

q OTHER OUTPUT VOLTAGES AVAILABLE UPON

REQUEST

q FOLDBACK CURRENT LIMIT

q THERMAL PROTECTION

q SMALL SURFACE-MOUNT PACKAGES:

SOT23-5 and MSOP-8

APPLICATIONS

q PORTABLE COMMUNICATION DEVICES

q BATTERY-POWERED EQUIPMENT

q PERSONAL DIGITAL ASSISTANTS

q MODEMS

q BAR-CODE SCANNERS

q BACKUP POWER SUPPLIES

DESCRIPTION

The REG113 is a family of low-noise, low-dropout linear

regulators with low ground pin current. Its new DMOS topol-

ogy provides significant improvement over previous designs,

including low-dropout voltage (only 250mV typ at full load),

and better transient performance. In addition, no output

capacitor is required for stability, unlike conventional low-

dropout regulators that are difficult to compensate and re-

quire expensive low ESR capacitors greater than 1

µF.

Typical ground pin current is only 850

µA (at I

and drops to 10nA when not enabled. Unlike regulators with

PNP pass devices, quiescent current remains relatively con-

stant over load variations and under dropout conditions.

The REG113 has very low output noise (typically 28

µVrms

in portable communications equipment. Accuracy is main-

tained over temperature, line, and load variations. Key

parameters are tested over the specified temperature range

(–40

°C to +85°C).

The REG113 is well protected—internal circuitry provides a

current limit which protects the load from damage, further-

more, thermal protection circuitry keeps the chip from being

damaged by excessive temperature. The REG113 is avail-

able in SOT23-5 and MSOP-8 packages.

SBVS031D – MARCH 2001 – REVISED SEPTEMBER 2005

REG113

Enable

GND

0.1

µF

C

OUT

(1)

+

+

V

OUT

V

IN

NOTES: (1) Optional. (2) NR = Noise Reduction.

DMOS

400mA Low-Dropout Regulator

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