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Linear & low-dropout (LDO) regulators

LM337

ACTIVE

1.5-A, negative, adjustable linear voltage regulator

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Data sheet

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TPS7A33 ACTIVE 1-A, high-PSRR, negative, adjustable low-dropout voltage regulator with enable Wider voltage range

LM337

ACTIVE
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Product details

Output options Adjustable Output, Negative Output Iout (max) (A) 1.5 Vin (max) (V) -3 Vin (min) (V) -40 Vout (max) (V) -1.2 Vout (min) (V) -37 Noise (µVrms) 1110 Iq (typ) (mA) 1.5 Thermal resistance θJA (°C/W) 23 Rating Catalog Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 2.4 PSRR at 100 KHz (dB) 19 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) 0 to 125
Output options Adjustable Output, Negative Output Iout (max) (A) 1.5 Vin (max) (V) -3 Vin (min) (V) -40 Vout (max) (V) -1.2 Vout (min) (V) -37 Noise (µVrms) 1110 Iq (typ) (mA) 1.5 Thermal resistance θJA (°C/W) 23 Rating Catalog Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 2.4 PSRR at 100 KHz (dB) 19 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) 0 to 125
TO-220 (KCS) 3 46.228 mm² 10.16 x 4.55 TO-252 (KVU) 3 66.726 mm² 6.6 x 10.11 TO-263 (KTT) 3 154.8384 mm² 10.16 x 15.24
  • Output Voltage Range Adjustable
    From –1.2 V to –37 V
  • Output Current Capability of 1.5 A Max
  • Input Regulation Typically 0.01% Per Input-
    Voltage Change
  • Output Regulation Typically 0.3%
  • Peak Output Current Constant Over Temperature
    Range of Regulator
  • Ripple Rejection Typically 77 dB
  • Direct Replacement for Industry-Standard LM237
    and LM337
  • Output Voltage Range Adjustable
    From –1.2 V to –37 V
  • Output Current Capability of 1.5 A Max
  • Input Regulation Typically 0.01% Per Input-
    Voltage Change
  • Output Regulation Typically 0.3%
  • Peak Output Current Constant Over Temperature
    Range of Regulator
  • Ripple Rejection Typically 77 dB
  • Direct Replacement for Industry-Standard LM237
    and LM337

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 require only two external resistors to set the output voltage and one output capacitor for frequency compensation.

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 require only two external resistors to set the output voltage and one output capacitor for frequency compensation.
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Technical documentation

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Type Title Date
* Data sheet LMx37 3-Terminal Adjustable Regulators datasheet (Rev. L) PDF | HTML 12 Jan 2015
Application note LDO Noise Demystified (Rev. B) PDF | HTML 18 Aug 2020
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) 21 Mar 2018
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML 09 Aug 2017
Application note AB-12 Wide Adjustable Range PNP Voltage Regulator (Rev. B) 06 May 2013
Application note AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) 06 May 2013
Application note AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) 06 May 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) 06 May 2013
Application note AN-42 IC Provides On-Card Regulation for Logic Circuits (Rev. B) 06 May 2013
Application note AN-178 Applications for an Adjustable IC Power Regulator (Rev. B) 05 May 2013
Application note AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) 05 May 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 05 May 2013
Application note AN-1061 Power Conversion in Line-Powered Equipment (Rev. B) 23 Apr 2013
Application note High-Efficiency Reg has Low Drop-Out Voltage (Rev. B) 23 Apr 2013
Analog Design Journal How to pick a linear regulator for noise-sensitive applications 22 Jan 2013
Application note ANY-OUT™ LDO Controlled by I2C™ IO Expander Device (Rev. A) 20 Sep 2012
Application note Packaging Limits Range of Linear Regulators 08 May 2010
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) 04 Jun 2008
Application note A New Production Technique for Trimming Voltage Regulators 03 Oct 2002
Application note Adjustable 3-Terminal Regulator for Low-Cost Battery Charging Systems 03 Oct 2002
Application note High Stability Regulators 03 Oct 2002
Application note Understanding the Terms and Definitions of LDO Voltage Regulators 21 Oct 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM317A-337N-EVM — 3-pin adjustable regulator evaluation module

The LM317A-337N-EVM demonstrates canonical application of the LM317A adjustable regulator and its negative complement, the LM337-N. The evaluation module (EVM) is assesmbled with the SOT-223 package option for each device, supplying up to 1 A of load current. The EVM is designed for easy (...)

User guide: PDF
Not available on TI.com
Simulation model

LM337-N PSpice Transient Model

SNVMAP5.ZIP (49 KB) - PSpice Model
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Simulation model

LM337-N Unencrypted PSpice Transient Model

SNVMAP4.ZIP (1 KB) - PSpice Model
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Reference designs

TIDA-00127 — 30W Ultra Wide Range Power Supply for Protection Relays Reference Design

This power supply solution for Protection Relays handles an ultra-wide range of both AC (88-276V AC) and DC (24-250V DC) inputs making it a suitable platform to power a variety of Protection Relays. The power supply is designed to output industry standard voltages (such as +/- 12V and isolated (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00227 — Small Form Factor 12W Ultra Wide Range Power Supply for Protection Relays - Reference Design

This small form factor, 12W power supply solution for protection relays handles an ultra-wide range of both AC and DC inputs making it a suitable platform to power a variety of lower power protection relays that need to be placed in a small housing.  The power supply is designed to output (...)
User guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
TO-220 (KCS) 3 Ultra Librarian
TO-252 (KVU) 3 Ultra Librarian
TO-263 (KTT) 3 Ultra Librarian
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