REG102

SBVS024F – NOVEMBER 2000 – REVISED SEPTEMBER 2005

www.ti.com

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 © 2000-2005, Texas Instruments Incorporated

DMOS

250mA Low-Dropout Regulator

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.

FEATURES

q NEW DMOS TOPOLOGY:

Ultra Low Dropout Voltage:

150mV typ at 250mA

Output Capacitor

q FAST TRANSIENT RESPONSE

q VERY LOW NOISE: 28

q HIGH ACCURACY:

q HIGH EFFICIENCY:

q 2.5V, 2.8V, 2.85V, 3.0V, 3.3V, AND 5.0V

ADJUSTABLE OUTPUT VERSIONS

q OTHER OUTPUT VOLTAGES AVAILABLE UPON

REQUEST

q FOLDBACK CURRENT LIMIT

q THERMAL PROTECTION

q SMALL SURFACE-MOUNT PACKAGES:

SOT23-5, SOT223-5, and SO-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 REG102 is a family of low-noise, low-dropout linear

regulators with low ground pin current. The new DMOS

topology provides significant improvement over previous

designs, including low-dropout voltage (only 150mV 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

require expensive low ESR capacitors greater than 1

µF.

Typical ground pin current is only 600

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 REG102 has very low output noise (typically 28

µVrms

in portable communications equipment. On-chip trimming

results in high output voltage accuracy. Accuracy is main-

tained over temperature, line, and load variations. Key pa-

rameters are tested over the specified temperature range

(–40

°C to +85°C).

The REG102 is well protected—internal circuitry provides a

current limit that protects the load from damage; furthermore,

thermal protection circuitry keeps the chip from being dam-

aged by excessive temperature. The REG102 is available in

SOT23-5, SOT223-5, and SO-8 packages.

REG102

(Fixed Voltage

Versions)

Enable

GND

0.1

µF

C

OUT

(1)

+

+

V

OUT

V

IN

NR

NR = Noise Reduction

NOTE: (1) Optional.

REG102-A

GND

Enable

0.1

µF

+

C

OUT

(1)

+

V

OUT

V

IN

R

2

R

1

Adj

REG1

02

REG1

02

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