UNITRODE UC182-1, UC182-2, UC182-3, UC282-1, UC282-2, UC282-3, UC282-ADJ, UC382-1, UC382-2, UC382-3, UC382-ADJ Technical data

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UNITRODE UC182-1, UC182-2, UC182-3, UC282-1, UC282-2, UC282-3, UC282-ADJ, UC382-1, UC382-2, UC382-3, UC382-ADJ Technical data

UC1-1

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

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

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

Fast LDO Linear Regulator

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 linear 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 adjustable version can be set with two external resistors. If the external resistors are omitted, the output voltage defaults to 1.2V.

BLOCK DIAGRAM

UDG-96037-1

SLUS317 - JANUARY 1999

ABSOLUTE MAXIMUM RATINGS

VB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13V VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7.5V Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.2V to 6.0V Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C Junction Temperature. . . . . . . . . . . . . . . . . . . –55°C to +150°C Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C

Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages.

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

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

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

ORDERING INFORMATION

Temperature Range

Package

 

Output Voltage

1: –55°C to +125°C

T: TO-220

1: 1.5V

2: –25°C to +100°C

TD: TO-263

2:

2.1V

3: 0°C to +100°C

 

3:

2.5V

ADJ: 1.2V or Adjustable

CONNECTION DIAGRAMS

5-Pin TO-220 (Top View)

 

 

5-Pin TO-263 (Top View)

T Package

 

 

TD Package

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: Tab tied to Pin 3.

Note: Tab tied to Pin 3.

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these parameters apply for TA = –55°C to 125°C for the UC182-X series, –25°C to +100°C for the UC282-X series and 0°C to +100°C for the UC382-X, VB = 5V; VIN = 3.3V, VOUT = 2.5V for the UC382-ADJ, TA = TJ.

PARAMETERS

TEST CONDITIONS

MIN

TYP

MAX

UNITS

UC382-3 Fixed 2.5V, 3A Family

 

 

 

 

 

Output Voltage (IVOUT = 100mA)

UC382-3

2.475

2.500

2.525

V

 

UC282-3 and UC182-3

2.450

2.500

2.525

V

Load Regulation

IVOUT = 10mA to 3A

 

0.5

4

mV

VIN PSSR

 

80

100

 

dB

VB PSSR

 

50

60

 

dB

VIN Dropout Voltage = VIN–VOUT

IVOUT = 3A, TJ = 25°C

 

350

425

mV

 

IVOUT = 3A, UC382-3

 

350

450

mV

 

IVOUT = 3A, UC282-3 and UC182-3

 

350

500

mV

VB Dropout = VB–VOUT

IVOUT = 3A, UC382-3

 

1.8

2.10

V

 

IVOUT = 3A, UC282-3

 

1.8

2.20

V

 

IVOUT = 3A, UC182-3

 

1.8

2.35

V

Short Circuit Current Limit

 

3.3

 

4.5

A

VB Current

IVOUT = 10mA

 

6

9

mA

 

IVOUT = 3A

 

18

60

mA

VIN Current

IVOUT = 3A

2.94

2.97

 

A

UC382-2 Fixed 2.1V, 3A Family

 

 

 

 

 

Output Voltage (IVOUT = 100mA)

UC382-2

2.079

2.100

2.121

V

 

UC282-2 and UC182-2

2.058

2.100

2.121

V

Load Regulation

IVOUT = 10mA to 3A

 

0.5

4

mV

VIN PSSR

 

80

100

 

dB

2

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