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 |
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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) |
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5-Pin TO-263 (Top View) |
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T Package |
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TD Package |
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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 |
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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 |
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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 |
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1.8 |
2.20 |
V |
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IVOUT = 3A, UC182-3 |
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1.8 |
2.35 |
V |
Short Circuit Current Limit |
|
3.3 |
|
4.5 |
A |
VB Current |
IVOUT = 10mA |
|
6 |
9 |
mA |
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IVOUT = 3A |
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18 |
60 |
mA |
VIN Current |
IVOUT = 3A |
2.94 |
2.97 |
|
A |
UC382-2 Fixed 2.1V, 3A Family |
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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