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    LM2931A is a fixed 3-terminal low dropout voltage regulator designed to need very low quiescent current. Internally, implemented circuits include 60V load dump protection, -50V reverse transient short circuit and thermal over load protection. • Limited input voltage and high efficiency. • Internal thermal over load protection.
    The LM2931 series regulators are designed with many protection features making them essentially blow−out proof. These features include internal current limiting, thermal shutdown, overvoltage and reverse polarity input protection, and the capability to withstand temporary power−up with mirror−image insertion.
    The LM2931-N family includes a fixed 5V output (±3.8% tolerance for A grade) or an adjustable output with ON/OFF pin. Both versions are available in a TO-220 power package, DDPAK/TO-263 surface mount package, and an 8-lead SOIC package. The fixed output version is also available in the TO-92 plastic package. Figure 2.
    The LM2931 series can be current boosted with a PNP transistor. The D45VH7, on a heatsink, will provide an output current of 5.0 A with an input to output voltage differential of approximately 1.0 V. Resistor R in conjunction with the VBE of the PNP determines when the pass transistor begins conducting. This circuit is not short circuit proof.
  2. LM2931A Datasheet(PDF) - Fairchild Semiconductor

  3. LM2931-N data sheet, product information and support | TI.com

  4. LM2931 Datasheet(PDF) - ON Semiconductor

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