DP83869HM: Power consumption difference between three-supply configuration and two-supply configuration

Hi Oba,

Here are the current consumption numbers for each rail in two-supply mode:

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/861383/dp83869hm-current-requirements-of-the-ethernet-transceiver-power-rails

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/968474/dp83869hm-power-requirements-for-individual-rails-on-phy

Comparing this to the power consumption in the datasheet for three-supply mode will clarify if the efficiency of the external regulator justifies using 3 supply mode.

Thank you,

Evan

Hello Evan,

I read the link you mentioned, but the number is exactly same as the number in the datasheet(P12, SNLS614B)
Because there is I(1V8) numbers in the datasheet, I think the datasheet numbers are for three-suplly mode.
Is the power source of the internal LDO VDD2P5? If so, I(2V5) should in two-supply mode should be higer than it in three-supply mode.

Regards,
Oba