LM338T Linear Voltage Regulator IC Positive Adjustable 1 Output 5A
TO-220-3
Description
The LM138 series of adjustable 3-terminal positive voltage
regulators is capable of supplying in excess of 5 A over a 1.2-V to
32-V output range. They are exceptionally easy to use and require
only 2 resistors to set the output voltage. Careful circuit design
has resulted in outstanding load and line regulation, comparable to
many commercial power supplies. The LM138 family is supplied in a
standard 3-lead transistor package. A unique feature of the LM138
family is timedependent current limiting. The current limit
circuitry allows peak currents of up to 12 A to be drawn from the
regulator for short periods of time. This allows the LM138 to be
used with heavy transient loads and speeds start-up under full-load
conditions. Under sustained loading conditions, the current limit
decreases to a safe value protecting the regulator. Also included
on the chip are thermal overload protection and safe area
protection for the power transistor. Overload protection remains
functional even if the adjustment (ADJ) pin is accidentally
disconnected. Normally, no capacitors are needed unless the device
is situated more than 6 inches from the input filter capacitors in
which case an input bypass is needed. An output capacitor can be
added to improve transient response, while bypassing the adjustment
pin increases the ripple rejection of the regulator. Besides
replacing fixed regulators or discrete designs, the LM138 is useful
in a wide variety of other applications. Because the regulator is
floating and receives only the input-to-output differential
voltage, supplies of several hundred volts can be regulated as long
as the maximum input to output differential is not exceeded; do not
short-circuit output to ground. The part numbers in the LM138
series which have a K suffix are packaged in a standard steel
TO-CAN package, while those with a T suffix are packaged in a
TO-220 plastic package. The LM138 is rated for TJ = –55°C to 150°C,
and the LM338 is rated for TJ = 0°C to 125°C.
Output Configuration | Positive |
Output Type | Adjustable |
Number of Regulators | 1 |
Voltage - Input (Max) | 40V |
Voltage - Output (Min/Fixed) | 1.24V |
Voltage - Output (Max) | 32V |
Voltage Dropout (Max) | - |
Current - Output | 5A |
PSRR | 75dB ~ 60dB (120Hz) |
Control Features | - |
Protection Features | Over Temperature, Short Circuit |
Operating Temperature | 0°C ~ 125°C |
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