LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
SLVS047C ± NOVEMBER 1981 ± REVISED JULY 1999
DOutput Voltage Range Adjustable From ±1.2 V to ±37 V
DOutput Current Capability of 1.5 A Max
DInput Regulation Typically 0.01% Per Input-Voltage Change
DOutput Regulation Typically 0.3%
KC PACKAGE (TOP VIEW)
OUTPUT
INPUT
ADJUSTMENT
The INPUT terminal is in electrical contact with the mounting base.
TO-220AB
DPeak Output Current Constant Over Temperature Range of Regulator
DRipple Rejection Typically 77 dB
DDirect Replacement for National Semiconductor LM237 and LM337
description
The LM237 and LM337 are adjustable 3-terminal negative-voltage regulators capable of supplying in excess of ±1.5 A over an output voltage range of ±1.2 V to ±37 V. They are exceptionally easy to use, requiring only two external resistors to set the output voltage and one output capacitor for frequency compensation. The current design has been optimized for excellent regulation and low thermal transients. In addition, the LM237 and LM337 feature internal current limiting, thermal shutdown, and safe-area compensation, making them virtually immune to failure by overloads.
The LM237 and LM337 serve a wide variety of applications, including local on-card regulation, programmable output-voltage regulation, and precision current regulation.
The LM237 is characterized for operation over the virtual junction temperature range of ±25°C to 150°C. The LM337 is characterized for operation over the virtual junction temperature range of 0°C to 125°C.
O
I A
KTE PACKAGE (TOP VIEW)
OUTPUT
INPUT
ADJUSTMENT
The INPUT terminal is in electrical contact with the mounting base.
O I
A
AVAILABLE OPTIONS
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PACKAGED DEVICES |
CHIP |
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PLASTIC |
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TJ |
HEAT-SINK MOUNTED |
FORM |
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FLANGE MOUNTED |
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(KC) |
(Y) |
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(KTE) |
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± 25°C to 150°C |
LM237KC |
LM237KTE |
Ð |
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0°C to 125°C |
LM337KC |
LM337KTE |
LM337Y |
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The KTE package is only available taped and reeled. Add the R suffix to the device type (e.g.,
LM237KTER). Chip forms are tested at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright 1999, Texas Instruments Incorporated
POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
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LM237, LM337
3-TERMINAL ADJUSTABLE REGULATORS
SLVS047C ± NOVEMBER 1981 ± REVISED JULY 1999
schematic diagram
ADJUSTMENT
OUTPUT
INPUT
absolute maximum ratings over operating temperature ranges (unless otherwise noted)²
Input-to-output differential voltage, VI ± VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . . . ±40 V |
Package thermal impedance, θJA (see Notes 1 and 2): KC package . . . . . . . . . . . . . . . . . . . . . |
. . . . . . 22°C/W |
KTE package . . . . . . . . . . . . . . . . . . . . |
. . . . . . 23°C/W |
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . . . . 260°C |
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
±65°C to 150°C |
² Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) ± TA)/θJA. Operating at the absolute maximum TJ of 150°C can impact reliability. Due to variations in individual device electrical characteristics and thermal resistance, the built-in thermal overload protection may be activated at power levels slightly above or below the rated dissipation.
2.The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace length of zero.
recommended operating conditions
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MIN |
MAX |
UNIT |
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Output current, IO |
|VI ± VO| ≤ 40 V, |
P ≤ 15 W |
10 |
1500 |
mA |
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|VI ± VO| ≤ 10 V, |
P ≤ 15 W |
6 |
1500 |
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Operating virtual junction temperature, TJ |
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LM237 |
± 25 |
150 |
°C |
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LM337 |
0 |
125 |
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POST OFFICE BOX 655303 •DALLAS, TEXAS 75265 |
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