TEXAS INSTRUMENTS UC282-1, UC282-2, UC282-3, UC282-ADJ, UC382-1, UC382-2, UC382-3, UC382-ADJ Data Manual

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SLUS317B − JANUARY 2000 − REVISED FEBRUARY 2004

Fast Transient Response 5-PIN TO-220 T PACKAGE (TOP VIEW)

10-m A to 3-A Load Current Short Circuit Protection Maximum Dropout of 450-m V at 3-A Load Current Separate Bias and VIN Pins Available in Adjustable or Fixed-Output Voltages 5-Pin Package Allows Kelvin Sensing of

5-PIN TO-263

Load Voltage

TD PACKAGE

Reverse Current Protection

(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 m V maximum at 100°C and 350 m V 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

R1 R2 UC382−ADJ OPEN UC382−1 (1.5 V) 2 k UC382−2 (2.1 V) 2 k 1.5 kΩ UC382−3 (2.5 V) 2 k 2.16 k

THERMAL SHUTDOWN

1.2 V BANDGAP REFERENCE

SHORT R2R1 CIRCUIT SENSE

ADJGND VOUT UDG-00080

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