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.