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LM138K- - MIL-LM138K/MIL
5 Amp Adjustable Regulator
Original Creation Date: 07/12/95
Last Update Date: 08/13/01
Last Major Revision Date: 08/02/01
MNLM138-X REV 1A0
MICROCIRCUIT DATA SHEET
5 AMP ADJUSTABLE POWER REGULATOR
General DescriptionThe 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 condition. 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.
Normanlly, 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 LM 138 is usefull 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 voltage, is not exceeded.
NS Part NumbersLM138K-MIL
Industry Part NumberLM138
Prime DieLM138
ProcessingMIL-STD-883, Method 5004
Quality Conformance InspectionMIL-STD-883, Method 5005
Subgrp Description Temp ( C)o Static tests at +25 Static tests at +125 Static tests at -55 Dynamic tests at +25 Dynamic tests at +125 Dynamic tests at -55 Functional tests at +25 Functional tests at +125 Functional tests at -55 Switching tests at +25 Switching tests at +125 Switching tests at -55
