LM237 LM337
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LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
Output Voltage Range Adjustable From -1.2 Output Current Capability Input Regulation Typically 0.01% Input-Voltage Change Output Regulation Typically 0.3% Peak Output Current Constant Over Temperature Range Regulator Ripple Rejection Typically Direct Replacement National Semiconductor LM237 LM337
PACKAGE (TOP VIEW) OUTPUT INPUT ADJUSTMENT INPUT terminal electrical contact with mounting base. TO-220AB
description
LM237 LM337 adjustable 3-terminal negative-voltage regulators capable supplying excess over output voltage range -1.2 They exceptionally easy use, requiring only external resistors output voltage output capacitor frequency compensation. current design been optimized excellent regulation thermal transients. addition, LM237 LM337 feature internal current limiting, thermal shutdown, safe-area compensation, making them virtually immune failure overloads. LM237 LM337 serve wide variety applications, including local on-card regulation, programmable output-voltage regulation, precision current regulation. LM237 characterized operation over virtual junction temperature range -25°C 150°C. LM337 characterized operation over virtual junction temperature range 125°C.
AVAILABLE OPTIONS PACKAGED DEVICES HEAT-SINK MOUNTED (KC) LM237KC LM337KC PLASTIC FLANGE MOUNTED (KTE) LM237KTE LM337KTE CHIP FORM LM337Y PACKAGE (TOP VIEW)
OUTPUT INPUT ADJUSTMENT INPUT terminal electrical contact with mounting base.
25°C 150°C 125°C
package only available taped reeled. suffix device type (e.g., LM237KTER). Chip forms tested 25°C. Please aware that important notice concerning availability, standard warranty, critical applications Texas Instruments semiconductor products disclaimers thereto appears this data sheet.
Copyright 1999, Texas Instruments Incorporated
PRODUCTION DATA information current publication date. Products conform specifications terms Texas Instruments standard warranty. Production processing does necessarily include testing parameters.
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LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
schematic diagram
ADJUSTMENT
OUTPUT
INPUT
absolute maximum ratings over operating temperature ranges (unless otherwise noted)
Input-to-output differential voltage, Package thermal impedance, (see Notes package 22°C/W package 23°C/W Lead temperature (1/16 inch) from case seconds 260°C Storage temperature range, Tstg 65°C 150°C
Stresses beyond those listed under "absolute maximum ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under "recommended operating conditions" implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability. NOTES: Maximum power dissipation function TJ(max), maximum allowable power dissipation allowable ambient temperature (TJ(max) TA)/JA. Operating absolute maximum 150°C impact reliability. variations individual device electrical characteristics thermal resistance, built-in thermal overload protection activated power levels slightly above below rated dissipation. package thermal impedance calculated accordance with JESD except through-hole packages, which trace length zero.
recommended operating conditions
Output current current, erating Operating virtual junction erature, temperature LM237 LM337 1500 1500 UNIT
POST OFFICE 655303
DALLAS, TEXAS 75265
LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
electrical characteristics over recommended ranges operating virtual junction temperature (unless otherwise noted)
PARAMETER Input regulation Ripple rejection TEST CONDITIONS 25°C CADJ |VO| |VO| |VO| |VO| 0.6% 0.3% LM237 0.01 0.02 0.5% 0.6% 0.3% 0.02 0.05 LM337 0.01 0.02 1.5% 0.04 0.07 UNIT
Output regulation
25°C
Output-voltage change with temperature Output-voltage long-term drift Output noise voltage Minimum output current maintain regulation Peak output current Adjustment-terminal current Change adjustment-terminal current Reference voltage (output ADJ)
After 1000 kHZ, 25°C 0.24 25°C
0.3% 0.003%
0.3% 0.003%
0.15
rated dissipation
25°C,
1.225 1.25 1.25
1.275 1.213
1.25 1.25
1.287
25°C
Thermal regulation Initial 25°C, 10-ms pulse 0.002 0.02 0.003 0.04 Unless otherwise noted, these specifications apply following test conditions conditions shown MAX, appropriate value specified under recommended operating conditions. characteristics measured with 0.1-µF capacitor across input 1-µF capacitor across output. Pulse-testing techniques used maintain junction temperature close ambient temperature possible. Thermal effects must taken into account separately. Input regulation expressed here percentage change output voltage change input.
POST OFFICE 655303
DALLAS, TEXAS 75265
LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
electrical characteristics, 25°C
PARAMETER Input regulation Ripple rejection Output regulation Output noise voltage Minimum output current maintain regulation Peak output current Adjustment-terminal current Change adjustment-terminal current Reference voltage (output ADJ) rated dissipation 1.213 TEST CONDITIONS CADJ |VO| |VO| 0.3% 0.003% 0.15 1.25 1.287 LM237, LM337 0.01 0.04 UNIT
Unless otherwise noted, these specifications apply following test conditions characteristics measured with 0.1-µF capacitor across input 1-µF capacitor across output. Pulse-testing techniques used maintain junction temperature close ambient temperature possible. Thermal effects must taken into account separately. Input regulation expressed here percentage change output voltage change input.
POST OFFICE 655303
DALLAS, TEXAS 75265
LM237, LM337 3-TERMINAL ADJUSTABLE REGULATORS
APPLICATION INFORMATION
LM237 LM337 INPUT OUTPUT
ADJUSTMENT
typically
1.25
where output volts.
1-µF solid tantalum capacitor required only regulator more than from power-supply filter capacitor. 1-µF solid tantalum 10-µF aluminum electrolytic capacitor required stability.
Figure Adjustable Negative-Voltage Regulator
LM237 LM337 INPUT OUTPUT ADJUSTMENT
1.25 ILIMIT
Figure Current-Limiting Circuit
POST OFFICE 655303
DALLAS, TEXAS 75265
IMPORTANT NOTICE Texas Instruments subsidiaries (TI) reserve right make changes their products discontinue product service without notice, advise customers obtain latest version relevant information verify, before placing orders, that information being relied current complete. products sold subject terms conditions sale supplied time order acknowledgement, including those pertaining warranty, patent infringement, limitation liability. warrants performance semiconductor products specifications applicable time sale accordance with TI's standard warranty. Testing other quality control techniques utilized extent deems necessary support this warranty. Specific testing parameters each device necessarily performed, except those mandated government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS INVOLVE POTENTIAL RISKS DEATH, PERSONAL INJURY, SEVERE PROPERTY ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). SEMICONDUCTOR PRODUCTS DESIGNED, AUTHORIZED, WARRANTED SUITABLE LIFE-SUPPORT DEVICES SYSTEMS OTHER CRITICAL APPLICATIONS. INCLUSION PRODUCTS SUCH APPLICATIONS UNDERSTOOD FULLY CUSTOMER'S RISK. order minimize risks associated with customer's applications, adequate design operating safeguards must provided customer minimize inherent procedural hazards. assumes liability applications assistance customer product design. does warrant represent that license, either express implied, granted under patent right, copyright, mask work right, other intellectual property right covering relating combination, machine, process which such semiconductor products services might used. TI's publication information regarding third party's products services does constitute TI's approval, warranty endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
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