TPS3851: Can we use TPS3851G33 for VDD of 4.6V

DELJO DAVIS

Part Number: TPS3851

Tool/software:

HI Team,

PLease see our scheme

OUr TPS3851 VDD is connected to 4.6V. So i am thinking about which voltage option part we need to select. IF we use TPS3851G50 then our VDD will be less than the VITN and REST# pin of TPS will get asserted always.

So can we use part TPS3851G33E for 4.6V VCC and watchdog function?

We want the TPS3851G33E to work as a Watchdog IC. VCC rail monitoring is not needed. If we use TPS3851G33E the VITN will be 3.3V and VDD voltage will be 4.6V. Will this make any issue to the watchdog functionality of the IC?

5 months ago

0 Jesse Villanueva 5 months ago

TI__Mastermind 19100 points

Hi Deljo,

Sorry for the delay. You can use the https://www.ti.com/product/TPS3431 instead. This is the watchdog only version of the TPS3851.

Jesse

0 DELJO DAVIS 5 months ago in reply to Jesse Villanueva

Intellectual 270 points

HI Jessie,

BUt we already proceeded with TPS3851G33E. Do you see any concern in this case?

0 Jesse Villanueva 5 months ago in reply to DELJO DAVIS

TI__Mastermind 19100 points

Hi Deljo,

The only concern that I see is that if there is an undervoltage fault in the 4.6V rail and RESET is asserted, the watchdog functionality will disable. If that is not a concern for your design then the 33E will work fine for what you intended.

Jesse

+1 DELJO DAVIS 5 months ago in reply to Jesse Villanueva

Intellectual 270 points

Hi jessie,

Thanks

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TPS3851: Can we use TPS3851G33 for VDD of 4.6V