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difference b/w a LDO and a DC-DC converter

Discussion in 'Electronic Basics' started by pmm, Jun 12, 2004.

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  1. pmm

    pmm Guest

    hello
    may be this question is silly but i want to main difference between a
    LDO and a DC-DC converter
    thanks in advance
    PMM
     
  2. An LDO (low drop out regulator) is a form of linear series regulator,
    and like all linear series regulators, it wastes any excess voltage
    leaving only the desired output voltage. It is called low drop out,
    because it is capable of wasting a very small voltage, if that is what
    is required, where most linear series regulators require that there be
    at least 1.5 volts excess for them to waste in order to provide good
    regulation.

    A DC to DC converter is a circuit that creates a regulated (and
    usually isolated) DC output voltage when it is powered from a DC
    source. They convert the DC to AC, and use switching regulator
    techniques to waste as little energy as possible as this AC is
    converter back to some new DC voltage. Switching regulators are
    always more complicated than linear regulators because they must
    contain energy storage elements (inductors and capacitors) that are
    used to filter the pulsed AC back to DC.

    Here are links to tutorials on regulators.
    Linear series regulators:
    http://www.national.com/appinfo/power/files/f4.pdf
    Switching regulators:
    http://www.national.com/appinfo/power/files/f5.pdf
     
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