Original Creation Date: 06/27/95
Last Update Date: 09/18/95
Last Major Revision Date: 06/27/95
MDLM117-K REV 0A0 MICROCIRCUIT DATA SHEET
POSITIVE THREE TERMINAL ADJUSTABLE VOLTAGE REGULATOR
General Description
The LM117 adjustable 3-terminal positive voltage regulator is capable of supplying in
excess of 1.5A 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 a 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.
For applications requiring greater output current, see LM150 (3A) and LM138 (5A) data
sheets. For the negative complement, see LM137 data sheet.
NS Part Numbers
LM117K-SMD
Industry Part Number
LM117K
Prime Die
LM117K
Controlling Document
DESC.# 7703401YA
Processing
MIL-STD-883, Method 5004
Quality Conformance Inspection
MIL-STD-883, Method 5005
Subgrp Description Temp ( C)
o
1 Static tests at +25
2 Static tests at +125
3 Static tests at -55
4 Dynamic tests at +25
5 Dynamic tests at +125
6 Dynamic tests at -55
7 Functional tests at +25
8A Functional tests at +125
8B Functional tests at -55
9 Switching tests at +25
10 Switching tests at +125
11 Switching tests at -55
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MICROCIRCUIT DATA SHEET
MDLM117-K REV 0A0
Features
- Guaranteed 1.5A output current.
- Adjustable output down to 1.2V.
- Current limit constant with temperature.
- 80 dB ripple rejection.
- Output is short-circuit protected.
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MICROCIRCUIT DATA SHEET
MDLM117-K REV 0A0
(Absolute Maximum Ratings)
(Note 1)
Power Dissipation Internally Limited
Input-Output Voltage Differential +40V, -0.3V
Maximum Junction Temperature 150 C
Storage Temperature Range -65 C to +150 C
Lead Temperature (Soldering, 10 seconds) 300 C
Thermal Resistance
ThetaJA 38 C/W (Still Air) TBD (500LF/Min Air flow)
3 C/WThetaJC
ESD Tolerance
(Note 2) 3kV
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Operating ratings indicate conditions for which the device is intended to be
functional, but do not guarantee specific performance limits. For guaranteed
specifications and test conditions, see the Electrical Characteristics. The
guaranteed specifications apply only for the test conditions listed.
Note 2: Human body model, 1.5K Ohms in series with 100pF.
Recommended Operating Conditions
Operating Temperature Range -55 C < TA < +125 C
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MDLM117-K REV 0A0 MICROCIRCUIT DATA SHEET
Electrical Characteristics
DC PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
DC: Il = 8mA
SYMBOL PARAMETER CONDITIONS NOTES PIN-
NAME MIN MAX UNIT SUB-
GROUPS
Vref Reference Voltage Vdiff = 3V 1.2 1.3 V 1
Vin = 40V 1.2 1.3 V 1, 2,
3
Vdiff = 3.3V 1.2 1.3 V 2, 3
Rline Line Regulation 3V < Vdiff < 40V, Vout = Vref -9 9 mV 1
3.3V < Vdiff < 40V, Vout = Vref -23 23 mV 2, 3
Rload Load Regulation Vdiff = 3V, 10mA < Il < 1.5A -15 15 mV 1
Vdiff = 40V, 10mA < Il < 300mA -15 15 mV 1
Vdiff = 3.3V, 10mA < Il < 1.5A -15 15 mV 2, 3
Vdiff = 40V, 10mA < Il < 195mA -15 15 mV 2, 3
Vrth Thermal
Regulation Vin = 14.6V, Il = 1.5A, Pd = 20W,
t = 20mS -16 16 mV 1
Iadj Adjustment Pin
Current Vdiff = 3V 100 uA 1
Vdiff = 40V 100 uA 1, 2,
3
Vdiff = 3.3V 100 uA 2, 3
Delta Iadj Adjustment Pin
Current Change Vdiff = 3V, 10mA < Il < 1.5A -5 5 uA 1
Vdiff = 40V, 10mA < Il < 300mA -5 5 uA 1
3V < Vdiff < 40V -5 5 uA 1
Vdiff = 3.3V, 10mA < Il < 1.5A -5 5 uA 2, 3
Vdiff = 40V, 10mA < Il < 195mA -5 5 uA 2, 3
3.3V < Vdiff < 40V -5 5 uA 2, 3
Ilmin Minimum Load
Current Vdiff = 3V, Vout = 1.4V, (forced) 5 mA 1
Vdiff = 40V, Vout = 1.4V, (forced) 5 mA 1, 2,
3
Vdiff = 3.3V, Vout = 1.4V, (forced) 5 mA 2, 3
Icl Current Limit Vdiff = 15V 1.5 3.5 A 1, 2,
3
Vdiff = 40V .18 1.5 A 1
AC PARAMETERS
(The following conditions apply to all the following parameters, unless otherwise specified.)
AC: Il = 8mA
Rn Ripple Rejection f = 120Hz, Cadj = 10uF, Vout = Vref 1 66 dB 4, 5,
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MDLM117-K REV 0A0 MICROCIRCUIT DATA SHEET
Note 1: Group "A" sample only, test at all temp.
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MICROCIRCUIT DATA SHEET
MDLM117-K REV 0A0
Graphics and Diagrams
GRAPHICS# DESCRIPTION
9757HRE2 METAL CAN (KA), TO-3, 2LD, LOW PROFILE (B/I CKT)
K02CRD METAL CAN (KA), TO-3, 2LD,LOW PROFILE (P/P DWG)
See attached graphics following this page.
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