REG102-25 Datasheet, PDF (1/25 Pages) Texas Instruments – 250mA Low-Dropout Regulator

REG102
REG102
REG102
SBVS024F – NOVEMBER 2000 – REVISED SEPTEMBER 2005
DMOS
250mA Low-Dropout Regulator
FEATURES
q NEW DMOS TOPOLOGY:
Ultra Low Dropout Voltage:
150mV typ at 250mA
Output Capacitor not Required for Stability
q FAST TRANSIENT RESPONSE
q VERY LOW NOISE: 28µVrms
q HIGH ACCURACY: ±1.5% max
q HIGH EFFICIENCY:
I_GND = 600µA at I_OUT = 250mA
Not Enabled: I_GND = 0.01µA
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 1µF.
Typical ground pin current is only 600µA (at I_OUT = 250mA)
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 28µVrms
for V_OUT = 3.3V with C_NR = 0.01µF), making it ideal for use
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.
Enable
V_IN
+
0.1µF
REG102
(Fixed Voltage
Versions)
NR
GND
NR = Noise Reduction
V_OUT
+ _COUT(1)
V_IN
+
0.1µF
NOTE: (1) Optional.
Enable
REG102-A
GND
R₁ +
Adj
V_OUT
C_OUT(1)
R₂
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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.
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