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Power supply device and electronic control unit for lowering a minimum operating voltage and suppressing a consumed current to be low

  • US 10,268,221 B2
  • Filed: 02/20/2017
  • Issued: 04/23/2019
  • Est. Priority Date: 05/12/2016
  • Status: Active Grant
First Claim
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1. A power supply device comprising:

  • a first linear regulator for receiving a voltage from a direct-current power supply at all times and outputting a first voltage;

    a switching regulator of a step-down type for receiving the voltage from the direct-current power supply through a path via a power supply switch and outputting an intermediate voltage; and

    a second linear regulator for receiving the intermediate voltage and outputting a second voltage, wherein;

    the power supply device is configured to output a higher one of the first voltage and the second voltage through an output terminal;

    the first linear regulator is configured to have a smaller consumption current and a higher minimum operating voltage than those of the second linear regulator;

    the switching regulator is configured to drive a main switching element, which is interposed in series with a voltage input-output path of the switching regulator, to turn on at all times, when the voltage supplied from the direct-current power supply is equal to or lower than a predetermined value;

    the second linear regulator executes an outputting operation of the second voltage during a full-on period, in which the main switching element of the switching regulator is turned on at all times.

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