UC282 1, UC282 2, UC282 3, UC282 ADJ, UC382 1, UC382 2, UC382 3, UC382 ADJ
FAST LDO LINEAR REGULATOR
SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004
D
D
D
D
D
D
D
D
Fast Transient Response
10-mA to 3-A Load Current
Short Circuit Protection
Maximum Dropout of 450-mV at 3-A Load
Current
Separate Bias and VIN Pins
Available in Adjustable or Fixed-Output
Voltages
5-Pin Package Allows Kelvin Sensing of
Load Voltage
Reverse Current Protection
5-PIN TO-220
T PACKAGE (TOP VIEW)
5-PIN TO-263
TD PACKAGE
(TOP VIEW)
Note: Tab = Ground
description
The UC382 is a low-dropout-linear regulator providing a quick response to fast load changes. Combined with
its precision onboard reference, the UC382 excels at driving GTL and BTL buses. Due to its fast response to
load transients, the total capacitance required to decouple the regulator’s output can be significantly decreased
when compared to standard LDO linear regulators.
Dropout voltage (VIN to VOUT) is only 450 mV maximum at 100°C and 350 mV typical at 3-A load.
The onboard bandgap reference is stable with temperature and scaled for a 1.2-V input to the internal-power
amplifier. The UC382 is available in fixed-output voltages of 1.5 V, 2.1 V, or 2.5 V. The output voltage of the
adjustable version can be set with two external resistors. If the external resistors are omitted, the output voltage
defaults to 1.2 V.
block diagram
VB
1
R1
UC382−ADJ
UC382−1 (1.5 V)
UC382−2 (2.1 V)
UC382−3 (2.5 V)
THERMAL
SHUTDOWN
2
1.2 V
BANDGAP
REFERENCE
+
VIN
OPEN
2k
2k
2k
R2
0
500
Ω
1.5 k
Ω
2.16 k
Ω
R1
R2
SHORT
CIRCUIT
SENSE
3
GND
5
ADJ
4
VOUT
UDG-00080
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
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