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LM337IMP

Adjustable negative LDO, -1.2V to -37V output, 1A, SOT-223-4, complement to LM317, obsolete

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Manufacturer Part：

LM337IMP

Package：

SOT-223-4 (TO-261-4, 6.5 x 3.5mm)

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Description

Product Overview

The LM337IMP is an adjustable 3-terminal negative voltage regulator from Texas Instruments, capable of supplying up to 1A output current over an output voltage range of -1.2V to -37V. Packaged in a surface-mount SOT-223-4, it requires only two external resistors to set the output voltage. The device features internal current limiting, thermal shutdown, and safe-area compensation, making it virtually blowout-proof.

Key Specifications

Output Type Adjustable Negative
Output Voltage Range -1.2V to -37V
Output Current 1A (SOT-223 package)
Input Voltage Range -4.2V to -40V
Reference Voltage -1.250V (typical)
Line Regulation 0.01%/V (typical)
Load Regulation 0.3% (typical)
Ripple Rejection 77dB (typical)
Dropout Voltage 1.9V (typical)
Package SOT-223-4 (6.5 x 3.5mm)
Operating Temperature -40°C to +125°C
Status Obsolete (replaced by LM337IMP/NOPB)

Features

  • Output voltage adjustable from -1.2V to -37V
  • 1A output current in SOT-223 package (2W dissipation)
  • Only 2 external resistors required to set output voltage
  • 0.01%/V line regulation
  • 77dB ripple rejection
  • Internal thermal overload protection
  • Internal short-circuit current limiting
  • Safe-area compensation
  • Complement to LM317 positive regulator

Applications

  • Negative supply rails for op-amp circuits
  • Split-rail power supplies (with LM317)
  • Adjustable lab power supplies
  • Bias voltage generators for RF circuits
  • Industrial control and instrumentation
  • Audio amplifier dual-rail supplies

The LM337IMP is an adjustable 3-terminal negative voltage regulator from Texas Instruments, providing output voltages from -1.2V to -37V at up to 1A load current in the SOT-223-4 surface-mount package. It is the negative complement to the LM317 positive regulator, and together they can form a complete split-rail power supply. The device requires only two external resistors to program the output voltage. Internal protection includes current limiting, thermal shutdown, and safe-area compensation, making the device essentially indestructible under normal operating conditions. Note: This specific part number (LM337IMP) is obsolete; the replacement is LM337IMP/NOPB.

The LM337IMP maintains a constant -1.25V reference between the output (VOUT) and adjustment (ADJ) pins. An external resistor R1 connected between VOUT and ADJ establishes a constant current through the voltage divider. A second resistor R2 from ADJ to ground sets the output voltage: VOUT = -1.25V × (1 + R2/R1). The adjustment pin draws a small quiescent current (65µA typical) which contributes a negligible error term. The internal pass transistor regulates by controlling the current flow from input to output, maintaining the desired output voltage despite changes in load current or input voltage. The dropout voltage of approximately 1.9V means the input must be at least 1.9V more negative than the output for proper regulation.

Pin Name Description
1 ADJ Adjustment terminal (connects to voltage divider)
2 VOUT Regulated output voltage (-1.2V to -37V)
3 VIN Unregulated input voltage (-4.2V to -40V)
4 (Tab) VOUT Output (connected to pin 2, heat sink tab)
  • Dual-Rail Op-Amp Supply: Pair the LM337IMP with an LM317 to create ±15V or ±12V supplies for dual-supply op-amps. Connect the LM337’s output to the negative rail and the LM317’s output to the positive rail. Use matched resistor dividers for symmetric output voltages. Add 10µF bypass capacitors at ADJ pins for improved ripple rejection.
  • Adjustable Negative Lab Supply: Use a potentiometer for R2 to create a continuously adjustable negative supply from -1.2V to -30V. Add protection diodes to prevent damage from output-to-input shorts or ADJ pin capacitor discharge during output short-circuit events.
  • RF Bias Voltage Generator: Generate precise negative gate bias voltages for GaAs FETs or PHEMTs in RF power amplifiers. The 77dB ripple rejection and low output noise ensure stable bias conditions for optimal RF performance.
Model Output Current Package Key Difference
LM337IMP/NOPB -1.2V to -37V 1A SOT-223 Direct replacement (active)
LM337BD2TG -1.2V to -37V 1.5A D2PAK Higher current, TO-263
TPS7A33 -0.9V to -18V 1A VSON-10 Lower noise, higher PSRR
LT1175 -2.5V to -25V 500mA SOIC-8 Low dropout, ADI alternative
LM337T -1.2V to -37V 1.5A TO-220 Through-hole, higher power
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