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ꢋꢈꢌꢍ ꢎ ꢉꢏ ꢎ ꢐꢑꢒ ꢈꢓ ꢓꢒꢔ ꢀ ꢎꢈꢍꢏ ꢓ
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SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004
5-PIN TO-220
D
Fast Transient Response
T PACKAGE (TOP VIEW)
D
D
D
10-mA to 3-A Load Current
Short Circuit Protection
Maximum Dropout of 450-mV at 3-A Load
Current
D
Separate Bias and VIN Pins
D
Available in Adjustable or Fixed-Output
Voltages
D
D
5-Pin Package Allows Kelvin Sensing of
Load Voltage
5-PIN TO-263
TD PACKAGE
(TOP VIEW)
Reverse Current Protection
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
R2
UC382−ADJ
OPEN
2 k
0
UC382−1 (1.5 V)
UC382−2 (2.1 V)
UC382−3 (2.5 V)
500
1.5 k
Ω
Ω
Ω
2 k
2 k
2.16 k
THERMAL
SHUTDOWN
2
VIN
1.2 V
BANDGAP
REFERENCE
+
SHORT
CIRCUIT
SENSE
R2
R1
3
5
4
GND
ADJ
VOUT
UDG-00080
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.
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Copyright 2000−2004, Texas Instruments Incorporated
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