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LM5122ZA: LM5122ZA Negative Input Negative Output

Part Number: LM5122ZA

Hi,

I am wondering if I can design the LM5122ZA with negative Input and negative output configuration?
I know in the datasheet it shows the circuit diagram of negative input to postivie out.

Regards,

Mustafa

  • Hi Mustafa,


    Thanks for considering our device.

    Could you share detailed requirements? Input voltage, output voltage and output current.

    BR Dehuan

  • Hi Dehuan,

    Thank you for replying.

    The Input voltage is -48V

    The output voltage is -15V

    And output current is 2A.

    I know the TPS40210DGQ has the above specs, however, I want more safety margine between my input voltage and the maximum input voltage of TPS40210DGQ.

    Hence, I want to know if LM5122ZA can be designed for negative input (-48V) to negative output (-15V), or perhaps a more suitable IC.

    Regards,
    Mustafa

  • Hi Mustafa

    1. It is can be use done, like below. See below and replace the diode with the sync FET.