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Product details

Parameters

Output options Adjustable Output, Negative Output Iout (Max) (A) 0.1 Vin (Max) (V) -4.2 Vin (Min) (V) -40 Vout (Max) (V) -1.2 Vout (Min) (V) -37 Noise (uVrms) 38 Iq (Typ) (mA) 0.05 Thermal resistance θJA (°C/W) 111 Load capacitance (Min) (µF) 1 Rating Catalog Regulated outputs (#) 1 Features Accuracy (%) 1.4 Dropout voltage (Vdo) (Typ) (mV) 2200 Operating temperature range (C) -25 to 100 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 TO-92 (LP) 3 19 mm² 5.2 x 3.68 open-in-new Find other Linear regulators (LDO)

Features

  • Adjustable Output Down to 1.2 V
  • Ensured 100-mA Output Current
  • Line Regulation Typically 0.01%/V
  • Load Regulation Typically 0.1%
  • Current Limit Constant With Temperature
  • Eliminates the Need to Stock Many Voltages
  • Standard 3-Pin Transistor Package
  • 80-dB Ripple Rejection
  • Output is Short Circuit Protected
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Description

The LM337L is an adjustable 3-pin negative voltage regulator capable of supplying 100 mA over a –1.2-V to –37-V output range. The LM337L is easy to use and requires only two external resistors to set the output voltage. Both line and load regulation are better than standard fixed regulators. The LM337L is packaged in a standard, easy-to-use TO-92 transistor package.

In addition to higher performance than fixed regulators, the LM337L offers full overload protection. 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 pin is disconnected.

Normally, only a single 1-µF solid tantalum output capacitor is required unless the device is situated more than 6 inches from the input filter capacitors, in which case an input bypass is required. A larger output capacitor can be added to improve transient response. The adjustment pin can be bypassed to achieve very high ripple rejection ratios, which are difficult to achieve with standard 3-pin regulators.

Besides replacing fixed regulators, the LM337L is useful in a wide variety of other applications. Because the regulator is floating and monitors 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.

The LM337L makes a simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM337L can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment pin to ground, which programs the output to 1.2 V, where most loads draw little current.

The LM337L is available in a standard TO-92 transistor package and a standard SO-8 surface mount package. The LM337L is rated for operation over a –25°C to 125°C range.

For applications requiring output current in excess of 0.5 A and 1.5 A, The LM137 series may be suitable. For the positive complement, the LM117 and LM317L series are options.

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Technical documentation

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Type Title Date
* Datasheet LM337L 3-Terminal Adjustable Regulator datasheet (Rev. E) Dec. 09, 2016
Application notes A Topical Index of TI LDO Application Notes (Rev. F) Jun. 27, 2019
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
Application notes AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) May 06, 2013
Application notes AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) May 06, 2013
Application notes Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) May 05, 2013
More literature Die D/S LM337L MDC 3-Terminal Adj Regulator Sep. 21, 2012
Application notes TO-92 Packing Options / Ordering Instructions (Rev. A) Jun. 23, 2010
Application notes Packaging Limits Range of Linear Regulators May 08, 2010
Application notes Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) Jun. 04, 2008
Application notes Understanding the Terms and Definitions of LDO Voltage Regulators Oct. 21, 1999

Design & development

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

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
TO-92 (LP) 3 View options

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