• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 256 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS55288: Vcc datasheet spec clarification

Viktorija Cecil
Mastermind 18471 points
Part Number: TPS55288

Team, 

Can you please clarify Vcc specs:

Bit of ambiguity in the datasheet in regards to Vcc for this part. There doesn't seem to be an operating range for Vcc listed specifically anywhere in the datasheet, just absolute max.

It states that the internal LDO output for Vcc is 5.2V and if you want to provide your own for power savings then it "must be within the 4.75-V to 5.5-V regulation range"

But all I/O thresholds are under the test condition "VCC = 2.7V to 5.5V". I also don't see any verbiage that prevents input and output from being less than 5V?

 

I stumbled across this when trying to verify if our 3v3 i2c pullups already in place would be acceptable.

Basically, we just need to know:

  • if 3v3 i2c pullup is acceptable when using internal 5V LDO?
  • also if it would be possible to power Vcc from our 3v3 rail (ambiguous)?

Thanks

Viktorija

  • 0
    TI__Mastermind 40080 points

    Dear Sir,

    Please check my reply below:

    • if 3v3 i2c pullup is acceptable when using internal 5V LDO?  --> 3v3 i2c pullup is acceptable 
    • also if it would be possible to power Vcc from our 3v3 rail (ambiguous)?   -->  no, VCC should be powered from a 5V source.