Texas Instruments UCC383T-5, UCC383T-3, UCC383TDTR-ADJ, UCC383TDTR-3, UCC383TD-ADJ Datasheet

SLUS215 - OCTOBER 1998

FEATURES

• Precision Positive Series Pass

Voltage Regulation

• 0.45V Dropout at 3A

• 50mV Dropout at 10mA

• Quiescent Current Under

650µA Irrespective of Load

• Adjustable (5 Lead) Output

Voltage Version

• Fixed (3 Lead) Versions for

3.3V and 5V Outputs

• Logic Shutdown Capability

• Short Circuit Power Limit of

3% •V

IN

• I

SHORT

• Low V

OUT

to V

IN

Reverse

Leakage

• Thermal Shutdown

DESCRIPTION

The UCC283-3/-5/-ADJ family of positive linear series pass regulators are tailored

for low drop out applications where low quiescent power is important. Fabricated

with a BiCMOS technology ideally suited for low input to output differential applica-

tions, the UCC283-5 will pass 3A while requiring only 0.45V of typical input voltage

headroom (guaranteed 0.6V dropout). These regulators include reverse voltage

sensing that prevents current in the reverse direction. Quiescent current is always

less than 650µA. These devices have been internally compensated in such a man-

ner that the need for a minimum output capacitor has been eliminated.

UCC283-3 and UCC283-5 versions are in 3 lead packages and have preset outputs

at 3.3V and 5.0V respectively. The output voltage is regulated to 1.5% at room tem-

perature. The UCC283-ADJ version, in a 5 lead package, regulates the output volt-

age programmed by an external resistor ratio.

Short circuit current is internally limited. The device responds to a sustained over-

current condition by turning off after a T

ON

delay. The device then stays off for a pe-

riod, T

OFF

, that is 32 times the T

ON

delay. The device then begins pulsing on and off

at the T

ON

/(T

ON

+T

OFF

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

tion during short circuit and means heat sinks need only accommodate normal op-

eration. On the 3 leaded versions of the device T

ON

is fixed at 750µs, on the

adjustable 5 leaded versions an external capacitor sets the on time — the off time

is always 32 times T

ON

. The external timing control pin, CT, on the five leaded ver-

sions also serves as a shutdown input when pulled low.

Internal power dissipation is further controlled with thermal overload protection cir-

cuitry. Thermal shutdown occurs if the junction temperature exceeds 165°C. The

chip will remain off until the temperature has dropped 20°C.

The UCC283 series is specified for operation over the industrial range of −40°Cto

+85°C, and the UCC383 series is specified from 0°C to +70°C. These devices are

available in 3 and 5 pin TO-220 and TO-263 power packages.

UCC283-3/-5/-ADJ

UCC383-3/-5/-ADJ

Low Dropout 3 Ampere Linear Regulator Family

BLOCK DIAGRAM

UDG-98133

2

UCC283-3/-5/-ADJ

UCC383-3/-5/-ADJ

ABSOLUTE MAXIMUM RATINGS

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

CT.......................................−0.3 to 3V

ADJ......................................−0.3 to 9V

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 termi-

nal. Consult Packaging Section of Databook for thermal limita-

tions and considerations of packages. All voltages are

referenced to GND.

CONNECTION DIAGRAMS

TO-263-3 (Front View)

TD Package

TO-263-5 (Front View)

TD Package

TO-220-3 (Front View)

T Package

TO-220-5 (Front View)

T Package

ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for T

A

=0°Cto70°C for the

UCC383-X series, −40°C to +85°C for the UCC283-X, V

VIN

=V

VOUT

+ 1.5V, I

OUT

= 10mA, C

IN

=10µF, C

OUT

=22µF. For the

283-ADJ, V

VIN

= 6.5V, CT = 750pF, T

J

=T

A

.

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

UCC283-5 Fixed 5V, 3A Family

Output Voltage T

J

=25°C 4.925 5 5.075 V

Over Temperature 4.875 5.125 V

Line Regulation V

VIN

= 5.15V to 9V 2 10 mV

Load Regulation I

OUT

= 10mA to 3A 10 20 mV

Dropout Voltage, V

DROPOUT

=V

VIN

− V

VOUT

I

OUT

= 3A, VOUT = 4.85V 0.4 0.6 V

I

OUT

= 1.5A, VOUT = 4.85V 0.2 0.45 V

I

OUT

= 10mA, VOUT = 4.85V 50 150 mV

Peak Current Limit V

VOUT

= 0V 4 5 6.5 A

Overcurrent Threshold 3 4 5.5 A

Current Limit Duty Cycle V

VOUT

=0V 3 5 %

Overcurrent Time Out, T

ON

V

VOUT

= 0V 400 750 1400 µs

Quiescent Current No load 400 650 µA

Reverse Leakage Current 0V < V

VIN

<V

VOUT

,

V

VOUT

≤ 5.1V, at V

VOUT

075mA

UVLO VIN where VOUT passes current 2.6 2.8 3 V

See Note 1

See Note 1See Note 1

Note 1: Tab = GND

3

UCC283-3/-5/-ADJ

UCC383-3/-5/-ADJ

ELECTRICAL CHARACTERISTICS:

Unless otherwise stated, these specifications hold for T

A

=0°Cto70°C for the

UCC383-X series, −40°C to +85°C for the UCC283-X, V

VIN

=V

VOUT

+ 1.5V, I

OUT

= 10mA, C

IN

=10µF, C

OUT

=22µF. For the

283-ADJ, V

VIN

= 6.5V, CT = 750pF, T

J

=T

A

.

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

UCC283-3 Fixed 3.3V, 3A Family

Output Voltage T

J

=25°C 3.25 3.3 3.35 V

Over Temperature 3.22 3.38 V

Line Regulation V

VIN

= 3.45V to 9V 2 7 mV

Load Regulation I

OUT

= 10mA to 3A 7 15 mV

Dropout Voltage, V

DROPOUT

=V

VIN

-

V

VOUT

I

OUT

= 3A, VOUT = 3.15V 0.5 1 V

I

OUT

= 1.5A, VOUT = 3.15V 0.25 0.6 V

I

OUT

= 10mA, VOUT = 3.15V 50 150 mV

Peak Current Limit V

VOUT

= 0V 4 5 6.5 A

Overcurrent Threshold 3 4 5.5 A

Current Limit Duty Cycle V

VOUT

=0V 3 5 %

Overcurrent Time Out, TON V

VOUT

= 0V 400 750 1400 µs

Quiescent Current No load 400 650 µA

Reverse Leakage Current 0V < V

VIN

<V

VOUT

,

V

VOUT

≤ 3.35V, at V

VOUT

075mA

UVLO VIN where VOUT passes current 2.6 2.8 3 V

UCC283-ADJ Adjustable Output, 3A Family

Regulating Voltage at ADJ Pin T

J

= 25°C 1.23 1.25 1.27 V

Over Temperature 1.22 1.28 V

Line Regulation, at ADJ Input V

VIN

=V

VOUT

+ 150mV to 9V 1 3 mV

Load Regulation, at ADJ Input I

OUT

= 10mA to 3A 2 5 mV

Dropout Voltage, V

DROPOUT

= VIN − VOUT V

VIN

> 4V, I

OUT

= 3A 0.4 0.6 V

V

VIN

> 3V, I

OUT

= 1.5A 0.2 0.45 V

V

VIN

> 3V, I

OUT

= 10mA 50 150 mV

Peak Current Limit V

VOUT

= 0V, VIN = 6.5V 4 5 6.5 A

Overcurrent Threshold V

VIN

= 6.5V 3 4 5.5 A

Current Limit Duty Cycle V

VOUT

=0V 3 5 %

Overcurrent Time Out, T

ON

V

VOUT

= 0V, CT = 1500pF 750 µs

Reverse Leakage Current 0V < V

VIN

<V

VOUT

,

V

VOUT

≤ 9V, at V

VOUT

0 100 mA

Bias current at ADJ Input 100 250 nA

Quiescent Current No load 400 650 µA

Shutdown Threshold At CT Input 0.25 0.45 V

Quiescent Current in Shutdown V

VIN

= 10V 40 75 µA

UVLO VIN where VOUT passes current 2.6 2.8 3 V