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FEATURES

CAP-FREE DMOS TOPOLOGY:

Ultra Low Dropout Voltage:

250mV typ at 400mA

Output Capacitor not Required for Stability

UP TO 500mA PEAK, TYPICAL

FAST TRANSIENT RESPONSE

VERY LOW NOISE: 28μVrms

HIGH ACCURACY: ±1.5% max

HIGH EFFICIENCY:

IGND = 850μA at IOUT = 400mA

Not Enabled: IGND = 0.01μA

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

OTHER OUTPUT VOLTAGES AVAILABLE UPON

REQUEST

FOLDBACK CURRENT LIMIT

THERMAL PROTECTION

SMALL SURFACE-MOUNT PACKAGES:

SOT23-5 and MSOP-8

APPLICATIONS

PORTABLE COMMUNICATION DEVICES

BATTERY-POWERED EQUIPMENT

PERSONAL DIGITAL ASSISTANTS

MODEMS

BAR-CODE SCANNERS

BACKUP POWER SUPPLIES

DESCRIPTION

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

regulators with low ground pin current. Its new DMOS topology

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 lowdropout

regulators that are difficult to compensate and require

expensive low ESR capacitors greater than 1μF.

Typical ground pin current is only 850μA (at IOUT = 400mA)

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

PNP pass devices, quiescent current remains relatively constant

over load variations and under dropout conditions.

The REG113 has very low output noise (typically 28μVrms

for VOUT = 3.3V with CNR = 0.01μF), making it ideal for use

in portable communications equipment. Accuracy is maintained

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, furthermore,

thermal protection circuitry keeps the chip from being

damaged by excessive temperature. The REG113 is available

in SOT23-5 and MSOP-8 packages.