REG101
REG
101
SBVS026C – JULY 2001
DMOS
100mA Low-Dropout Regulator
FEATURES
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NEW DMOS TOPOLOGY:
Ultra Low Dropout Voltage:
60mV typ at 100mA
Output capacitor NOT required for stability
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FAST TRANSIENT RESPONSE
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VERY LOW NOISE: 23
µ
Vrms
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HIGH ACCURACY:
±
1.5% max
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HIGH EFFICIENCY:
I
GND
= 500
µ
A at I
OUT
= 100mA
Not Enabled: I
GND
= 10nA
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2.5V, 2.8V, 2.85V, 3.0V, 3.3V, 5.0V, AND
ADJUSTABLE 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 SO-8
DESCRIPTION
The REG101 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 60mV 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 1µF.
Typical ground pin current is only 500µA (at I
OUT
= 100mA)
and drops to 10nA when not in enabled mode. Unlike regula-
tors with PNP pass devices, quiescent current remains rela-
tively constant over load variation and under dropout condi-
tions.
The REG101 has very low output noise (typically 23µVrms
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 REG101 is well protected—internal circuitry provides a
current limit that protects the load from damage. Thermal
protection circuitry keeps the chip from being damaged by
excessive temperature. The REG101 is available in the
SOT23-5 and the SO-8 packages.
APPLICATIONS
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PORTABLE COMMUNICATION DEVICES
BATTERY-POWERED EQUIPMENT
PERSONAL DIGITAL ASSISTANTS
MODEMS
BAR-CODE SCANNERS
BACKUP POWER SUPPLIES
Enable
V
IN
+
0.1µF
REG101
(Fixed Voltage
Versions)
Gnd
+
V
OUT
C
OUT(1)
V
IN
Enable
V
OUT
+
0.1µF
REG101-A
R
1
Adj
Gnd
NOTE: (1) Optional.
R
2
+
C
OUT(1)
NR
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.
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, Texas Instruments Incorporated
www.ti.com
TI [ TEXAS INSTRUMENTS ]
