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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**** 152430 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**** 152430 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.