UCC281-ADJ datasheet(2/10 Pages) TI

Part #	UCC281-ADJ

Description	Low Dropout 1 Ampere Linear Regulator Family

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UCC281-3/-5/-ADJ

UCC381-3/-5/-ADJ

ABSOLUTE MAXIMUM RATINGS

VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V

CT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−0.3 to 3V

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. All voltages are referenced to

GND.

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = 0

°C to 70°C for the

UCC381-X series and

−40°C to +85°C for the UCC283-X series, VIN =VOUT + 1.5V, IOUT = 0mA, COUT = 2.2µF. CT = 1500pF for

the UCC381-ADJ version and VOUT set to 5V. TJ = TA.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

UCC381-5 Fixed 5V, 1A Family

Output Voltage

TJ = 25°C

4.925

5

5.075

V

Over Temperature

4.875

5.125

V

Line Regulation

VIN = 5.15V to 9V

1

3

mV

Load Regulation

IOUT = 0mA to 1A

2

5

mV

Drop Out Voltage, VIN –VOUT

IOUT = 1A, VOUT = 4.85V, TA < 85°C

0.5

0.6

V

IOUT = 200mA, VOUT = 4.85V, TA < 85°C

100

200

mV

Peak Current Limit

VOUT = 0V

2

3.5

A

Overcurrent Threshold

1

1.8

A

Current Limit Duty Cycle

VOUT = 0V

3

5

%

Overcurrent Time Out, TON

VOUT = 0V

400

750

1600

µs

Quiescent Current

400

650

µA

Quiescent Current in Shutdown

VIN = 9V

10

25

µA

Shutdown Threshold

At CT Input

0.25

0.65

V

Reverse Leakage Current

1V < VIN <VOUT,VOUT < 5.1V, at VOUT

75

µA

UVLO Threshold

VIN where VOUT passes current

2.5

2.8

3.0

V

Short circuit current is internally limited. The device re-

sponds to a sustained overcurrent condition by turning

off after a TON delay. The device then stays off for a pe-

riod, TOFF, that is 32 times the TON delay. The device

then begins pulsing on and off at the TON /(TON+TOFF)

duty cycle of 3%. This drastically reduces the power dis-

sipation during short circuit such that heat sinking, if at all

required, must only accommodate normal operation. On

the fixed output versions of the device TON is fixed at

400

µs − a guaranteed minimum. On the adjustable ver-

sion an external capacitor sets the on time. The off time

is always 32 times TON.

The UCC381 can be shutdown to 25

µA (max) by pulling

the CT pin low.

Internal power dissipation is further controlled with ther-

mal overload protection circuitry. Thermal shutdown oc-

curs if the junction temperature exceeds 165

°C. The chip

will remain off until the temperature has dropped 20

°C.

The UCC281 series is specified for operation over the in-

dustrial range of

−40°C to +85°C, and the UCC381 se-

ries is specified from 0

°Cto+70°C. These devices are

available in the 8 pin DP surface mount power package.

For other packaging options consult the factory.

DESCRIPTION (cont.)

1

2

3

4

8

7

6

5

GND

VOUT

VOUTS

GND

VIN

CT*

GND

CONNECTION DIAGRAMS

SOIC-8 (Top View)

DP Package

* ADJ version only

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