Is LTC2977 used for sequence beyond 8ch?

Hi

I'm a DFAE in Japan. The customer has already registered LTC2977 as their standard part in company. Regarding our new opportunity, he's going to use two FPGAs and be more than 10 types of  power supplies. Then he would like to use LTC2977 for the sequence using the schematic as follows. Is it possible to connect two RUN pins to one Vout_EN pin? Is there anything I should be aware of if possible? Of course, this is to control two power supplies at the same time.

Regards,

Hiroyuki

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    •  Analog Employees 
    on Nov 17, 2020 6:08 PM

    Hi Hiroyuki,

    I have some questions.  Are they sharing the enable because they need to manage 9 channels? I suppose this is possible but it depends.  How do they plan to use the other channel resources?  Such as, Vsense and DAC.  Are reg1 and reg2 different voltages?  Do they need fault detection on either regulator?  We use the VSENSE pins to detect an OV, UV, or TON_MAX fault.

    Regards

    Mike

  • Hello Mike,

    Thank you very much for your support. The customer is thinking of supplying power to one FPGA from LTM4671 and Reg of another company. This time he uses two FPGAs, so he also uses two LTM4671s and two Regs. Then the same power supply is formed in two systems each, and the same power supply is controlled by one channel of the LTC2977. So reg1 and reg2 are the same voltage. We will confirm the fault detection in a meeting with the customer.

    Regards,

    Hiroyuki

Reply
  • Hello Mike,

    Thank you very much for your support. The customer is thinking of supplying power to one FPGA from LTM4671 and Reg of another company. This time he uses two FPGAs, so he also uses two LTM4671s and two Regs. Then the same power supply is formed in two systems each, and the same power supply is controlled by one channel of the LTC2977. So reg1 and reg2 are the same voltage. We will confirm the fault detection in a meeting with the customer.

    Regards,

    Hiroyuki

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