TPS54821: VOUT powered without VIN

lei zhou1

Part Number: TPS54821

Tool/software:

I want to ues TPS54821 to generate 5VDC at VOUT, VIN=12V, due to the need for testing, I need to supply a external 5V directly to VOUT, VIN will be powered off, so can I do this? Would it damage the TPS54821? Thanks.

9 months ago

0 Nancy Zhang 9 months ago

TI__Mastermind 49470 points

Hi Lei,

Yes, you can. Please read the paper as below. You may need to add an input diode to block the reverse current flowing backwards through the IC from output to input.

https://www.ti.com/lit/an/slyt689/slyt689.pdf?ts=1733752293908&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fen-us%252Fdocs%252Funiversalsearch.tsp%253FlangPref%253Den-US%2526nr%253D68%2526searchTerm%253Dslyt689

Hope this helps,

Thanks,

Nancy