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Switch between LDO and switched regulator

Discussion in 'Electronic Basics' started by Gopal, Oct 21, 2003.

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  1. Gopal

    Gopal Guest

    A basic design question: Can we implement some sort of "if
    condition" in a circuit to choose between LDO and switched regulator.
    The application is something like this.
    I have a device that is ti be run at 4V to 36V range. I know thats
    pretty big range. And my micro and other stuff works at 3.3V. Now, as
    per power efficiency of the regulators, I know LDo is better at
    voltages close to 4V and switched regulator is efficient at voltages
    close to 36V. So, is there any way a circuit can be designed to choose
    the LDOs deoending upon on the input voltage.

    Thank you

  2. John Larkin

    John Larkin Guest

    An LDO will be about 80% efficient dropping 4 to 3.3. A good switcher
    could beat this over the entire range.

  3. Gopal

    Gopal Guest

    A "good switching regulator" may again take more components than
    LDO. Do you have any good design schematic that can regulate 3.3V from
    4V-36V .


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