TPS22992: TPS22992s

Hale Tan

Part Number: TPS22992

Hi, team!

In the TPS22992 datasheet, the Vin can't exceed the Vbias. But there is little introduction about Vbias. I want to know about this pin function and why the Vin can't exceed the Vbias?

Thanks!

over 3 years ago

0 Kalin Burnside over 3 years ago

TI__Genius 13310 points

Hello Hale,

VBIAS biases the gate of the internal FET and powers some internal blocks. If VIN > VBIAS it wouldn't have proper behavior and exhibit characteristics outside of datasheet specifications.

Regards,

Kalin Burnside

0 Hale Tan over 3 years ago in reply to Kalin Burnside

TI__Expert 3770 points

Thanks, Kalin!

I am still curious about the reason about VIN <= VBIAS. Can you show the schematic diagram about Vin and Vbias. And give some detail why the Vin must be smaller than Vbias.

0 Kalin Burnside over 3 years ago in reply to Hale Tan

TI__Genius 13310 points

Hello Hale,

I cannot share anything beyond what is listed in the datasheet. Just like with any MOSFET- the normal mode of operation is when Vgs > Vds. You can see VIN as Vds and VBIAS as Vgs. Of course there's more to it than this; however, this is the basic concept.

Regards,

Kalin Burnside

Power management

Power management forum

TPS22992: TPS22992s