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LM2937 500 mA LDO Regulator

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by Ray

500 mA low-dropout fixed regulator with reverse-battery and load-dump protection.

regulatorldolow-dropoutautomotiveprotectiontito-220
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README

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LM2937

Texas Instruments · Linear Regulator (LDO) · TO-220

The LM2937 is a 500 mA low-dropout linear regulator with a fixed output. It tolerates reverse-battery connection and load-dump transients, making it a common choice for automotive and industrial supplies where the input rail is noisy or unregulated. It needs only a modest output capacitor for stability.

Pinout

Pin Name Type Function
1 INPUT power_in Unregulated voltage input. Operating range up to 26 V continuous (60 V transient, <=100 ms). Requires >= VOUT + 1 V for regulation; typical dropout 0.5 V at full rated load. Recommend a 0.1 uF input bypass capacitor.
2 GND power_in Ground reference for the regulator. Quiescent current ~10 mA at full load (2 mA typical at light load with sufficient headroom) returns through this pin.
3 OUTPUT power_out Regulated voltage output (5/8/10/12/15 V option depending on suffix). Delivers up to 500 mA (400 mA for SOT-223). Requires an output bypass capacitor (10 uF nominal) with ESR up to 3 ohm for stability; see Detailed Design Procedure.

Key specifications

Parameter Value
Type Fixed low-dropout linear regulator
Output current 500 mA
Dropout voltage 0.5 V typ at 500 mA
Input voltage Up to 26 V (load-dump to 60 V)
Protection Reverse battery, thermal, short circuit
Package TO-220 (3-lead)
Operating temperature -40 C to 125 C

Ordering variants

Same part, different packaging or reel option.

  • LM2937ET
  • LM2937ES
  • LM2937IMP

CAD (KiCad official)

  • Symbol: lm2937.kicad_sym
  • Footprint: lm2937.kicad_mod
  • 3D model: TO-220 body from KiCad Package_TO_SOT_THT/TO-220-3_Vertical.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (34 pp, sha256 7f5179c841e4236e, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF