UNITRODE UC182-1, UC182-2, UC182-3, UC282-1, UC282-2 Technical data
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Fast LDO Linear Regulator
UC182-1,-2,-3,-ADJ
UC282-1,-2,-3,-ADJ
UC382-1,-2,-3,-ADJ
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
BLOCK DIAGRAM
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.
SLUS317 - JANUARY 1999
UDG-96037-1
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.
CONNECTION DIAGRAMS
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
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
5-Pin TO-220 (Top View)
T Package
Note: Tab tied to Pin 3.
5-Pin TO-263 (Top View)
TD Package
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
Output Voltage (I
Load Regulation I
VIN PSSR 80 100 dB
VB PSSR 50 60 dB
VIN Dropout Voltage = VIN–VOUT I
VB Dropout = VB–VOUT I
Short Circuit Current Limit 3.3 4.5 A
VB Current I
VIN Current I
UC382-2 Fixed 2.1V, 3A Family
Output Voltage (IVOUT = 100mA) UC382-2 2.079 2.100 2.121 V
Load Regulation I
VIN PSSR 80 100 dB
VOUT = 100mA) UC382-3 2.475 2.500 2.525 V
UC282-3 and UC182-3 2.450 2.500 2.525 V
VOUT = 10mA to 3A 0.5 4 mV
VOUT = 3A, TJ = 25°C 350 425 mV
VOUT = 3A, UC382-3 350 450 mV
I
VOUT = 3A, UC282-3 and UC182-3 350 500 mV
I
VOUT = 3A, UC382-3 1.8 2.10 V
VOUT = 3A, UC282-3 1.8 2.20 V
I
VOUT = 3A, UC182-3 1.8 2.35 V
I
VOUT = 10mA 6 9 mA
VOUT = 3A 18 60 mA
I
VOUT = 3A 2.94 2.97 A
UC282-2 and UC182-2 2.058 2.100 2.121 V
VOUT = 10mA to 3A 0.5 4 mV
2
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