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LM25011: Bypass Problem

user3492445
Prodigy 20 points
Part Number: LM25011

Hello,

Vin: 10,2V to 35V (normally) DC

Vout: 9V DC

Iout max: 1.5A

Iout normally: 100mA

It works fine, no problem with the values.

But I have an special situation:

The power Vin goes down from 10,2 V to Zero in an Emergency Situation:

In this situation I need: Vin = Vout  also a bypass.

Has TI a solution for this situation?

A other regulator?

  • 0
    TI__Genius 11085 points
    To clarify your requirement, during emergency situation, you need Vin to supply Vout directly, bypass the regulator, down to zero volt, correct? I think you can have an external PMOS switch between Vin and Vout, controlled by Vin lower than a certain votlage, to bypass the reguator in case of Vin dropping. I'd look for a reference design.

    In such situation, you should also add a schottky diode between Vin and Vout, Anode to Vout and Cathod to Vin. It will by pass the internal FET when Vout is higher than Vin, to protect the regulator.

    -Yang
  • 0 in reply to YangZhang
    Prodigy 20 points
    Hello Yang,

    Yes, I need bypass the regulator.

    my hope was to use a ready regulator with the bypass inside......

    but now i try a PMOS solution.

    Have you experiance in this issue?

    -Stephan