Update: 30 September, 2023
The LM2937 500 mA Low Dropout Regulator is a positive voltage regulator capable of supplying up to 500 mA of load current. Use of a PNP power transistor provides a low dropout voltage characteristic. With a load current of 500 mA the minimum input to output voltage differential required for the output to remain in regulation is typically 0.5V (1V guaranteed maximum over the full operating temperature range). Special circuitry has been incorporated to minimize the quiescent current to typically only 10 mA with a full 500 mA load current when the input to output voltage differential is greater than 3V. The LM2937 requires an output bypass capacitor for stability. As with most low dropout regulators, the ESR of this capacitor remains a critical design parameter, but the LM2937 includes special compensation circuitry that relaxes ESR requirements. 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 connections, two-battery jumps and up to +60V/−50V load dump transients. Familiar regulator features such as short circuit and thermal shutdown protection are also built in.
File format: PDF
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MD5 Checksum: 5D4BD144B890F7F42A037406F0E9CB00
Publication date: 04 June, 2012
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PDF Link: National Semiconductor LM2937 500 mA Low Dropout Regulator handbook PDF