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LTC3122 Output Disconnect

Category: Software
Product Number: LTC3122

Hi team,

What triggers the output disconnect function?

When this happens, I think the PMOS will be turned off and the bulk of the PMOS will be switched to VIN.

This will prevent the VIN-to-VOUT current through the MIMO body diode.

Is this correct?

Best regards,

T-yoshi

  • Hi T-yoshi,

    Apologies for late response.

    3. What triggers the output disconnect function? When this happens, I think the PMOS will be turned off and the bulk of the PMOS will be switched to VIN. This will prevent the VIN-to-VOUT current through the MIMO body diode. Is this correct?

    ANS: The chip includes circuitry that switches the n-well body of the internal PMOS rectifier to either the input supply or to the output depending on whichever is higher. Thus, during start-up and shutdown, when the output voltage is less than the input supply, the n-well is switched to the input making the body diode reverse-biased. As a result, in shutdown, no current can flow to the output, and the output capacitor can be completely discharged to zero. Likewise, during start-up, the reverse-biased body diode prevents the inrush of current typically seen by the input supply.

    Feb 2004 High Efficiency Synchronous Boost Converter Provides Output Load Disconnect and Soft-start in ThinSOT Package (analog.com)

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