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LTC2972 vs LTC2974

Category: Hardware
Product Number: LTC2972

Hi ALL!

There is 2 and 4 channels of the PMBus controllers and they seem to be the same BUT 2972 doesn't support the overcurrent fault detection and shut down ability of the respective rail.
It measures the current, detects the overcurrent alarm like 2974 does but has no OC/UC response registers/commands.

What is the reason to exclude these features and will these features be supported in next revisions?

Tks

Alex

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  • Hi Alex,

    That's correct, the LTC2972 does not have OCP support. The device is a simpler version of the LTC2975.  I don't have any insight into future devices.  If you need to add OC supervision, you could use a current sense amp and tie its output to an LTC290x supervisor that has an open drain.  This open drain could be tied to a FAULTB pin.  The MFR_FAULT_RESPONSE should be enabled.

    Mike

Reply
  • Hi Alex,

    That's correct, the LTC2972 does not have OCP support. The device is a simpler version of the LTC2975.  I don't have any insight into future devices.  If you need to add OC supervision, you could use a current sense amp and tie its output to an LTC290x supervisor that has an open drain.  This open drain could be tied to a FAULTB pin.  The MFR_FAULT_RESPONSE should be enabled.

    Mike

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