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Details for LM338T by Texas Instruments
Semiconductors - ICs > Power Management ICs - PMIC > Voltage Regulators
V REG ADJ +1.2/32V TO-220-3 338
LM338T image

LM338T by Texas Instruments

V REG ADJ +1.2/32V TO-220-3 338
Adjustable Output Down to 1.2 V
Current Limit Constant With Temperature
Output is Short-Circuit Protected
P + Product Enhancement Tested
Specified 5-A Output Current
Specified 7-A Peak Output Current
Specified Thermal Regulation
Part Information
LM338T image
RoHS Compliant
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 Type:
Input Voltage Min:
Input Voltage Max:
Fixed Output Voltage Nom.:
Adjustable Output Voltage Min:
Adjustable Output Voltage Max:
Output Current:
Linear Regulator Case Style:
No. of Pins:
Operating Temperature Min:
Operating Temperature Max:
Product Range:
Automotive Qualification Standard:
No SVHC (27-Jun-2018)
Base Number:
Device Marking:
IC Generic Number:
No. of Outputs:
Operating Temperature Range:
0°C to +125°C
Output Current Max:
Output Voltage Adjustable Range:
1.2V to 32V
Output Voltage Max:
Output Voltage Min:
Primary Input Voltage:
Supply Voltage Min:
Voltage Regulator Type:
Positive Adjustable
Alternate Descriptions
Standard Regulator Pos 1.2V to 32V 5A 3-Pin(3+Tab) TO-220 Rail Avnet America