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JM38510/11704SYA
3-Terminal Adjustable Regulator
Original Creation Date: 06/27/95
Last Update Date: 02/07/01
Last Major Revision Date: 02/02/01
MJLM117-H REV 1A1
MICROCIRCUIT DATA SHEET
POSITIVE THREE TERMINAL ADJUSTABLE VOLTAGE REGULATOR
General DescriptionThe LM117 adjustable 3-terminal positive voltage regulator is capable of supplying in
excess of 0.5A over a 1.2V to 37V output range. It is exceptionally easy to use and
requires only two external resistors to set the output voltage. Further, both line and
load regulation are better than standard fixed regulators.
In addition to higher performance than fixed regulators, the LM117 offers full overload
protection available only in IC's. Included on the chip are current limit, thermal
overload protection and safe area protection. All overload protection circuitry remains
fully functional even if the adjustment terminal is 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 optional output
capacitor can be added to improve transient response. The adjustment terminal can be
bypassed to achieve very high ripple rejection ratios which are difficult to achieve with
standard 3-terminal regulators.
Besides replacing fixed regulators, the LM117 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., avoid short-circuiting the
output).
Also, it makes an especially simple adjustable switching regulator, a programmable output
regulator, or by connecting a fixed resistor between the adjustment pin and output, the
LM117 can be used as a precision current regulator. Supplies with electronic shutdown can
be achieved by clamping the adjustment terminal to ground which programs the output to
1.2V where most loads draw little current.
NS Part NumbersJL117BXA
JL117SXA
Industry Part NumberLM117H
Prime DieLM117H
Controlling Document38510/11703,AMEND.3 Cir.A REV A
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
