UC182-1,-2,-3,-ADJ

UC282-1,-2,-3,-ADJ

UC382-1,-2,-3,-ADJ

SLUS317 - JANUARY 1999

FEATURES

• Fast Transient Response

• 10mA to 3A Load Current

• Short Circuit Protection

• Maximum Dropout of 450mV at 3A

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

DESCRIPTION

The UC382 is a low dropout linear regulator providing a quick response to

fast load changes. Combined with its precision on-board 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 lin-

ear regulators.

Dropout voltage (VIN to VOUT) is only 450mV maximum at 100°C and

350mV typical at 3A load.

The on-board bandgap reference is stable with temperature and scaled for

a 1.200V input to the internal power amplifier. The UC382 is available in

fixed output voltages of 1.5V, 2.1V, or 2.5V. The output voltage of the adjust-

able version can be set with two external resistors. If the external resistors

are omitted, the output voltage defaults to 1.2V.

Fast LDO Linear Regulator

BLOCK DIAGRAM

UDG-96037-1