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

Low Dropout 3 Ampere Linear Regulator Family

UCC283-3/-5/-ADJ
UCC383-3/-5/-ADJ

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

• Low V

Leakage

• Thermal Shutdown

• I

IN

SHORT

to VINReverse

OUT

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 applica­tions, 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 man­ner 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 tem­perature. The UCC283-ADJ version, in a 5 lead package, regulates the output volt­age programmed by an external resistor ratio.

Short circuit current is internally limited. The device responds to a sustained over­current condition by turning off after a T
riod, T
at the T

, that is 32 times the TONdelay. The device then begins pulsing on and off

OFF

/(TON+T

ON

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

OFF

tion during short circuit and means heat sinks need only accommodate normal op­eration. On the 3 leaded versions of the device T
adjustable 5 leaded versions an external capacitor sets the on time — the off time
is always 32 times T

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

ON

sions also serves as a shutdown input when pulled low.

delay. The device then stays off for a pe-

ON

is fixed at 750µs, on the

ON

BLOCK DIAGRAM

Internal power dissipation is further controlled with thermal overload protection cir­cuitry. 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.

SLUS215 - OCTOBER 1998

UDG-98133

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 termi­nal. Consult Packaging Section of Databook for thermal limita­tions and considerations of packages. All voltages are
referenced to GND.

TO-220-3 (Front View)
T Package

CONNECTION DIAGRAMS

TO-263-3 (Front View)
TD Package

See Note 1

TO-220-5 (Front View)
T Package

See Note 1See Note 1

TO-263-5 (Front View)
TD Package

Note 1: Tab = GND

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

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

= 6.5V, CT = 750pF, TJ=TA.

VIN

VIN=VVOUT

+ 1.5V, I

= 10mA, CIN=10µF, C

OUT

=0°Cto70°C for the

A

=22µF. For the

OUT

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

UCC283-5 Fixed 5V, 3A Family

Output Voltage TJ=25°C 4.925 5 5.075 V

Over Temperature 4.875 5.125 V
Line Regulation V
Load Regulation I
Dropout Voltage, V

DROPOUT=VVIN

− V

VOUT

Peak Current Limit V

= 5.15V to 9V 2 10 mV

VIN

= 10mA to 3A 10 20 mV

OUT

I

= 3A, VOUT = 4.85V 0.4 0.6 V

OUT

I

= 1.5A, VOUT = 4.85V 0.2 0.45 V

OUT

I

= 10mA, VOUT = 4.85V 50 150 mV

OUT

= 0V 4 5 6.5 A

VOUT

Overcurrent Threshold 3 4 5.5 A
Current Limit Duty Cycle V
Overcurrent Time Out, T

ON

=0V 3 5 %

VOUT

V

= 0V 400 750 1400 µs

VOUT

Quiescent Current No load 400 650 µA
Reverse Leakage Current 0V < V

VIN<VVOUT

,

V

VOUT

≤ 5.1V, at V

VOUT

075mA

UVLO VIN where VOUT passes current 2.6 2.8 3 V

2

UCC283-3/-5/-ADJ
UCC383-3/-5/-ADJ

ELECTRICAL CHARACTERISTICS:

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

= 6.5V, CT = 750pF, TJ=TA.

VIN

Unless otherwise stated, these specifications hold for TA=0°Cto70°C for the

VIN=VVOUT

+ 1.5V, I

= 10mA, CIN=10µF, C

OUT

=22µF. For the

OUT

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

UCC283-3 Fixed 3.3V, 3A Family

Output Voltage T

=25°C 3.25 3.3 3.35 V

J

Over Temperature 3.22 3.38 V
Line Regulation V
Load Regulation I
Dropout Voltage, V

DROPOUT=VVIN

-

V

VOUT

Peak Current Limit V

= 3.45V to 9V 2 7 mV

VIN

= 10mA to 3A 7 15 mV

OUT

I

= 3A, VOUT = 3.15V 0.5 1 V

OUT

= 1.5A, VOUT = 3.15V 0.25 0.6 V

I

OUT

I

= 10mA, VOUT = 3.15V 50 150 mV

OUT

= 0V 4 5 6.5 A

VOUT

Overcurrent Threshold 3 4 5.5 A
Current Limit Duty Cycle V
Overcurrent Time Out, TON V

=0V 3 5 %

VOUT

= 0V 400 750 1400 µs

VOUT

Quiescent Current No load 400 650 µA
Reverse Leakage Current 0V < V

VIN<VVOUT

,

≤ 3.35V, at V

VOUT

VOUT

075mA

V

UVLO VIN where VOUT passes current 2.6 2.8 3 V

UCC283-ADJ Adjustable Output, 3A Family

Regulating Voltage at ADJ Pin T

= 25°C 1.23 1.25 1.27 V

J

Over Temperature 1.22 1.28 V
Line Regulation, at ADJ Input V
Load Regulation, at ADJ Input I
Dropout Voltage, V

DROPOUT

= VIN − VOUT V

Peak Current Limit V
Overcurrent Threshold V
Current Limit Duty Cycle V
Overcurrent Time Out, T

ON

VIN=VVOUT

OUT

VIN

V

VIN

V

VIN
VOUT
VIN
VOUT

V

VOUT

Reverse Leakage Current 0V < V

= 10mA to 3A 2 5 mV
> 4V, I
> 3V, I
> 3V, I

= 6.5V 3 4 5.5 A

+ 150mV to 9V 1 3 mV

= 3A 0.4 0.6 V

OUT

= 1.5A 0.2 0.45 V

OUT

= 10mA 50 150 mV

OUT

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

=0V 3 5 %
= 0V, CT = 1500pF 750 µs

V

VIN<VVOUT

,

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

= 10V 40 75 µA

VIN

UVLO VIN where VOUT passes current 2.6 2.8 3 V

3