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U CC 38 3- AD
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SLUS215A – OCTOBER 1998 – REVISED JUNE 2000
TO–263–3 TD PACKAGE
(FRONT VIEW)
TO–263–5 TD PACKAGE
(FRONT VIEW)
D
D
D
D
Precision Positive Linear Series Pass
Voltage Regulation
5
4
3
2
1
VOUT
0.45 V Dropout at 3 A
3
2
1
VOUT
GND
VIN
ADJ
GND
CT
50 mV Dropout at 10 mA
Quiescent Current Under 650 µA
Irrespective of Load
VIN
D
Adjustable (5-Lead) Output Voltage Version
TO–220–5 T PACKAGE
(FRONT VIEW)
D
Fixed (3-Lead) Versions for 3.3-V and 5-V
Outputs
5
4
3
2
1
VOUT
ADJ
GND
CT
D
D
Logic Shutdown Capability
+
Short-Circuit Power Limit of
(3% × V × I
)
VIN
IN
SHORT
D
Low V
to V Reverse Leakage
OUT IN
D
Thermal Shutdown
TO–220–3 T PACKAGE
(FRONT VIEW)
description
VOUT
GND
VIN
3
2
The UCC283–3/–5/–ADJ family of positive linear
+
series pass voltage 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 passes
3 A while requiring only 0.45 V of typical input
voltage headroom (ensured 0.6-V dropout).
1
These regulators include reverse voltage sensing that prevents current in the reverse direction. Quiescent
current is always less than 650 µA. These devices have been internally compensated in such a way 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 3.3 V and 5.0 V
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
time delay. The device then stays off for a period, t
, that is 32 times the t
delay. The device
ON
OFF
ON
then begins pulsing on and off at the t /(t +t
) duty cycle of 3%. This drastically reduces the power
ON ON OFF
dissipation during short-circuit and means heat sinks need only accommodate normal operation. On the
3-leaded versions of the device t is fixed at 750 µs, on the adjustable 5-leaded versions an external capacitor
ON
sets the on time. The off time is always 32 × t . The external timing control pin, CT, on the 5-leaded versions
ON
also serves as a shutdown input when pulled low.
Internal power dissipation is further controlled with thermal overload protection circuitry. Thermal shutdown
occurs if the junction temperature exceeds 165°C. The chip remains off until the temperature has dropped 20°C.
The UCC283 series is specified for operation over the industrial range of –40°C to 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.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2000, Texas Instruments Incorporated
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1
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