• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 62 subscribers
  • Views 464 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.

Fast startup time solution

Redick Lee
Prodigy 570 points
Other Parts Discussed in Thread: TPS62097, TPS22971

Hi Team,

 

Sorry to bother you. My customer would like to survey 3.3Vin/1.2Vout/0.5A PoL solution which need to support 30uS startup time.

May I have your suggestion? Thanks for your help and time.

 

Yours Faithfully

Redick Lee

  • 0
    TI__Guru**** 151530 points
    Hi Redick,

    Do I understand that they need the ramp time of Vout to be 30usec? Is this value a minimum, typical, or maximum ramp time?

    Most all DC/DCs are slower than this, so I suggest either a DC/DC with a SS pin (which can be left floating to give the fastest startup) like TPS62097 or a normal DC/DC followed by a load switch (which can turn on in less than 30 usec).
  • 0 in reply to Chris Glaser
    TI__Prodigy 570 points
    Hi Chris,

    Thanks for your quick reply. This 30us is typical time.
    Besides, after I check the TPS62097 datasheet, it seems the minimum startup time is 0.6ms. do you have any other solution which can meet this requirement.

    Yours Faithfully
    Redick Lee
  • 0 in reply to Redick Lee
    TI__Guru**** 151530 points
    Hi Redick,

    I don't know where you see 0.6msec. With that one, you could leave SS/TR floating and get a fast startup time. This may still be longer than 30 usec.

    I think the best solution is using any DC/DC, followed by a fast load switch. The TPS22971 looked good for your specs.