5 Amp Adjustable Regulator

The LM138 series of adjustable 3-terminal positive voltage Regulators is capable of supplying in excess of 5A over a 1.2V to 32V 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 time-dependent current limiting. The current limit circuitry allows peak currents of up to 12A 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 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 will increase the regulator's ripple rejection.
Besides replacing fixed Regulators or Discrete designs, the LM138 is useful in a wide variety of other applications. Since the Regulator is "floating" and sees 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, i.e., 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-3 package, while those with a T suffix are packaged in a TO-220 plastic package. The LM138 is rated for -55?C < TJ < +150?C, and the LM338 is rated for 0?C < TJ < +125?C.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM138K Linear Technology IC VREG 1.2 V-32 V ADJUSTABLE POSITIVE REGULATOR, MBFM2, METAL CAN, TO-3, 3 PIN, Adjustable Positive Single Output Standard Regulator
LM138K/883 Linear Technology IC VREG 1.2 V-32 V ADJUSTABLE POSITIVE REGULATOR, MBFM2, METAL, TO-3, 2 PIN, Adjustable Positive Single Output Standard Regulator
LM138K STEEL/NOPB Texas Instruments 5A Adjustable Output Linear Regulator / LDO in hermetic package 2-TO-3 -55 to 125
LM138K-MIL Texas Instruments 2-TO
LM138KG-MD8 Texas Instruments 0-DIESALE -55 to 125
LM138KG-MW8 Texas Instruments 0-WAFERSALE -55 to 125
LM138K STEEL Texas Instruments 5A Adjustable Output Linear Regulator / LDO in hermetic package 2-TO-3 -55 to 125
LM138 's PackagesLM138 's pdf datasheet
LM138K-STEEL TO-3
LM138K-MIL TO-3




LM138 Pinout, Pinouts
LM138 pinout,Pin out
This is one package pinout of LM138,If you need more pinouts please download LM138's pdf datasheet.

LM138 Application circuits
LM138 circuits
This is one application circuit of LM138,If you need more circuits,please download LM138's pdf datasheet.


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