Original question:
Hi team,
My customer would like to see the efficiency at 3.3Vin and about 0.6V/20A output. Could you provide the data?It is wished to be beyond 85%.
Thanks.
We do not have VIN = 3.3V data, or 0.6V output data, but I can make some estimations based on the data we do have.
The datasheet shows a VIN = 5V to VOUT 0.8V @ 20A with 90% efficiency. That represents 1.77W of loss (16W / 0.9 - 16W). Holding that same loss for 3.3V to 0.6V output will give an efficiency of 87%.
Please note - the TPS546D24A will require a >4V bias voltage for VDD5 or AVIN to power the MOSEFT drivers at 3.3V input. If no 5V bias voltage is available, and the customer does not want to use a charge-pump to make a 5V supply, there is a discrete voltage doubler circuit that can use the SYNC output pin of the TPS546D24A to boost a 3.3V supply voltage to power AVIN above 5V and use the internal VDD5 LDO to regulate the gate drive to 4.7V.
