National Semiconductor LM2937 Data Sheet
Summary
This comprehensive manual details the LM2937, a highly reliable positive voltage low dropout regulator designed for demanding power applications. Capable of supplying 500 mA with built-in protections—including short circuit, thermal shutdown, và reverse battery protection—it excels in harsh environments like automotive use. The documentation provides engineers and designers with complete electrical specifications, package options (TO-220, SOT-223, TO-263), and performance curves across extended temperature ranges to ensure stable system operation.
Page 1 Text Content
March
LM Low ropout egulator
LM2937 m A Low Dropout Regulator
nections, two-battery jumps and up to +60V/−50V load dump
General Description
transients. Familiar regulator features such as short circuit
The LM2937 is positive voltage regulator capable of sup-
and thermal shutdown protection are also built in.
plying up to m A of load current. The use of PNP power transistor provides low dropout voltage characteristic. With
Features
load current of m A the minimum input to output voltage
differential required for the output to remain in regulation is Fully specified for operation over −40˚C to +125˚C typically 0.5V (1V guaranteed maximum over the full operat- Output current in excess of m A
ing temperature range). Special circuitry has been incorpo- Output trimmed for 5% tolerance under all operating rated to minimize the quiescent current to typically only conditions m A with full m A load current when the input to out- Typical dropout voltage of 0.5V at full rated load current put voltage differential is greater than 3V.
Wide output capacitor ESR range, up to 3Ω
The LM2937 requires an output bypass capacitor for stabil- Internal short circuit and thermal overload protection ity. As with most low dropout regulators, the ESR of this ca-
Reverse battery protection
pacitor remains critical design parameter, but the LM2937
60V input transient protection
includes special compensation circuitry that relaxes ESR re-
Mirror image insertion protection
quirements. The LM2937 is stable for all ESR below 3Ω. This allows the use of low ESR chip capacitors. Ideally suited for automotive applications, the LM2937 will protect itself and any load circuitry from reverse battery con-
Connection Diagram and Ordering Information
TO-220 Plastic Package
SOT-223 Plastic Package
DS011280-2
DS011280-26
Order Number LM2937ET-5.0, LM2937ET-8.0,
Order Number LM2937IMP-5.0,
LM2937ET-10, LM2937ET-12 or LM2937ET-15
LM2937IMP-8.0, LM2937IMP-10,
See NS Package Number T03B
LM2937IMP-12 or LM2937IMP-15 See NS Package Number MP04A
TO-263 Surface-Mount Package
DS011280-6
Side View
DS011280-5
View Order Number LM2937ES-5.0, LM2937ES-8.0, LM2937ES-10, LM2937ES-12 or LM2937ES-15
See NS Package Number TS3B
National Semiconductor Corporation DS011280 www.national.com
Page Summary Contents For National Semiconductor LM2937 Data Sheet
Manual Details
| Brand | National |
|---|---|
| Pages | 11 |
| File Size | 308.39 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What kind of output capacitor is recommended for stability?
The regulator requires an output bypass capacitor; for optimal performance, users should select one with an ESR below 3Ω
Does the LM2937 offer any protection against unexpected input voltage changes?
Yes, it includes various protection features such as short circuit, thermal overload, transient voltage (up to +60V/-50V), and reverse battery protection.
What are the operating temperature limits for the standard LM2937 part?
The device is specified for operation over a range of –40˚C to +125˚C.