DP83867E: Requirement Information for Power Supply

vikas gupta1

Part Number: DP83867E
Other Parts Discussed in Thread: TPS7A54-Q1

Hi ,

We are using the DP83867E SGMII Transceiver, and need inputs in below points for designing the power supply for the same VDDA2P5 ,VVDD1P0, VDDA1P8 .

Output Accuracy ,

Overshoot,

Undershoot ,

Step Load (Iccstep),

Di/Dt ,

Slew Rate ,

Ripple Voltage

Please help in providing details for all 3 rails above requirements, it will surely help us.

THanks

Vikas

0 Ross Pimentel over 4 years ago

Hi Vikas,

Output accuracy, overshoot, and slew rate are already covered in the ABS MAX and ROC portion of the datasheet.

We do not have specific requirements for undershoot, step load, di/dt or ripple.

0 vikas gupta1 over 4 years ago in reply to Ross Pimentel

Thanks,

I am planning to use TPS7A54-Q1 LDO for the supply rail 2.5V have current 86mA, Please suggest or is there any other recommendation.

Also is there any start up ramp time requirement for this rail ??

Regards,

Vikas G.

0 Ross Pimentel over 4 years ago in reply to vikas gupta1

Hi Vikas,

There is only a sequence requirement if you are using 3 supply mode.

That LDO will work well with the DP83867E. Ramp time should generally not exceed 50ms.

Interface forum