BQ4050: BQ4050 RHOEN control

Star Xu

Part Number: BQ4050

I have a query need your help.

The press or shutdown pin is internally pulled with PBI power supply as the pull-up power supply. I want to know when the RHONE will turn on and there is PBI voltage on the PRES pin.

Waiting for your reply.

Thanks

Star

over 2 years ago

0 Wyatt Keller over 2 years ago

TI__Guru** 105770 points

Hello Star,

During the system present detection the PRES pin is momentarily pulled high. It will not be at the PBI voltage due to the zener diode.

Sincerely,

Wyatt Keller

0 Star Xu over 2 years ago in reply to Wyatt Keller

TI__Genius 9645 points

Hi Wyatt

Thanks for your answer.

May I known the voltage of this zener diode?

Thanks

Star

0 Wyatt Keller over 2 years ago in reply to Star Xu

TI__Guru** 105770 points

Hello Star,

The PRES pin sources approximately 10uA output current into an integrated clamp that stops the output from exceeding 6V max. Typically it clamps around 4.5V.

Sincerely,

Wyatt Keller

Power management

Power management forum

BQ4050: BQ4050 RHOEN control