TPS546D24A: 3.3PVIN operation with 5V bias

Jerry Chen

Expert 5110 points

Part Number: TPS546D24A

Hi there,

For 3.3PVIN operation, 5V bias would be better at VDD5 or AVIN? Any pros and cons?

Thanks.

over 3 years ago

0 Kris F over 3 years ago

TI__Genius 17905 points

Hi Jerry,

As mentioned in Section 7.3.2/3 in the datasheet, you will get some efficiency improvement by tying 5V bias to VDD5 and keeping AVIN tied to 3.3PVIN (with RC filter from PVIN as shown in Figure 26) since this will reduce internal LDO losses. I do not expect any cons to choosing this versus tying 5V to AVIN instead.

Regards,

Kris

Power management

Power management forum

TPS546D24A: 3.3PVIN operation with 5V bias