TPS543C20A: Regarding enable of Buck

prema R

Part Number: TPS543C20A

Tool/software:

We are using TPS543C20ARVFR in our design to provide 0.85V as VCCINIT supply for Zynq Ultrascale+ FPGA.We have used the buck as per the below implementation. We want to implement power on/off using a push button. The hard reset IC(LTC2954ITS8-1#TRPB) enable signal controls the PMIC and the GPO4 output of the PMIC is connected to enable of the buck. The GPO4 recommended voltage rating is at 3.3V max and hence we level shifted to 5V and provided. Please let us know if the below circuit is fine.

8 months ago

0 Britton Jones 8 months ago

TI__Expert 8476 points

Hello, this TPS543C20A schematic looks good. I would recommend adding a few more output caps to bring the effective capacitance around 2000uF for best transient performance

Best regards,

Britton

0 prema R 8 months ago in reply to Britton Jones

Intellectual 700 points

Hi Britton

The enable pin of the buck connected from PMIC is fine?Please let me know.

0 Britton Jones 8 months ago in reply to prema R

TI__Expert 8476 points

I of course cannot guarantee the operation of the PMIC but TPS543C20A ENABLE will be ON anytime that the voltage is above 1.6V. To turn OFF the EN, the PMIC will have to pull the enable signal to ground. If you do have questions about the PMIC operation specifically, I recommend creating a new thread with the PMIC part number so that the right engineer can support

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TPS543C20A: Regarding enable of Buck