REG113
SBVS031D – MARCH 2001 – REVISED SEPTEMBER 2005
DMOS
400mA Low-Dropout Regulator
FEATURES
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CAP-FREE DMOS TOPOLOGY:
Ultra Low Dropout Voltage:
250mV typ at 400mA
Output Capacitor
not
Required for Stability
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UP TO 500mA PEAK, TYPICAL
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FAST TRANSIENT RESPONSE
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VERY LOW NOISE: 28
µ
Vrms
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HIGH ACCURACY:
±
1.5% max
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HIGH EFFICIENCY:
I
GND
= 850
µ
A at I
OUT
= 400mA
Not Enabled: I
GND
= 0.01
µ
A
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2.5V, 2.85V, 3.0V, 3.3V, AND 5.0V OUTPUT VERSIONS
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OTHER OUTPUT VOLTAGES AVAILABLE UPON
REQUEST
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FOLDBACK CURRENT LIMIT
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THERMAL PROTECTION
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SMALL SURFACE-MOUNT PACKAGES:
SOT23-5 and MSOP-8
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 1µF.
Typical ground pin current is only 850µA (at I
OUT
= 400mA)
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 28µVrms
for V
OUT
= 3.3V with C
NR
= 0.01µF), making it ideal for use
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.
Enable
V
IN
+
0.1µF
REG113
+
V
OUT
C
OUT(1)
APPLICATIONS
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PORTABLE COMMUNICATION DEVICES
BATTERY-POWERED EQUIPMENT
PERSONAL DIGITAL ASSISTANTS
MODEMS
BAR-CODE SCANNERS
BACKUP POWER SUPPLIES
NR
(2)
GND
NOTES: (1) Optional. (2) NR = Noise Reduction.
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.
All trademarks are the property of their respective owners.
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
www.ti.com
TI [ TEXAS INSTRUMENTS ]
