TPS54426: TPS54426 Vreg5

zhang myth

Part Number: TPS54426
Other Parts Discussed in Thread: TPS74701

TPS54426 input is 4.5~18V, but on the SPEC, about Vreg5, is only show 5.3~5.7V when input is 6~18V.

customer wants to know the Vreg5 output when input is 4.5~6V, especially when input is 5V? Our test result Vreg is 4.6V when Vin is 5V. but what's the exact range from TI official reply?

over 5 years ago

0 aladdin wang61 over 5 years ago

Prodigy 90 points

Dear Myth,

Could you please help to check with customer with Power board's power down issue,thanks.

0 Jason Wang (BSR-MV) over 5 years ago

TI__Genius 9550 points

Hi Myth,
1. Vreg5 is 4.6V when Vin is 5V: The Vreg5 voltage is correct and the device can work well
2. Vreg5 UVLO is 4.1V; 4.6V is higher than 4.1V

0 aladdin wang61 over 5 years ago in reply to Jason Wang (BSR-MV)

Prodigy 90 points

Hi,Jason,Thanks for your reply. There are important problem, it is need your help, customer find the system's power down issue, it is happen with incontinuity satus, but they doubt TI's TPS54426 and TPS74701 have some problems. please check this block diagram and give some advices,thanks.

0 Jason Wang (BSR-MV) over 5 years ago in reply to aladdin wang61

TI__Genius 9550 points

Aladdin, Myth,
It is a complex system!
Simple comments here: power rails sequencing isse and poor load transient performance can result in RE-START. How to find the root cause, need more tests and waveforms to analysis. Let's discuss this case via email. my email address: jason.wang@ti.com

0 aladdin wang61 over 5 years ago in reply to Jason Wang (BSR-MV)

Prodigy 90 points

Thanks a lot, It is need to On site support, do you have any advices.thanks.

Power management

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TPS54426: TPS54426 Vreg5