LM2937

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM2937 SNVS100F – MARCH 2000 – REVISED JULY 2014 LM2937 500-mA Low Dropout Regulator 1 Features 1 Fully Specified for Operation Over −40°C to 125°C Output Current in Excess of 500 mA Output Trimmed for 5% Tolerance Under all Operating Conditions Typical Dropout Voltage of 0.5 V at Full Rated Load Current Wide Output Capacitor ESR Range, up to 3 Ω Internal Short Circuit and Thermal Overload Protection Reverse Battery Protection 60-V Input Transient Protection Mirror Image Insertion Protection 2 Applications Automotive Industrial Control Point-of-Load regulation space space space Simplified Schematic 3 Description The LM2937 is a positive voltage regulator capable of supplying up to 500 mA of load current. The 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 0.5 V (1-V ensured 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 3 V. 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 inclu...