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TPS62420 Settling Time

Philip Kristament
Prodigy 220 points
Other Parts Discussed in Thread: TPS62420, TPS62421, CC3200, TPS62080, TPS62085

Require 1.85V for CC3200 in pre-regulated mode.  Line and load regulation with less than 2% ripple, 500 mA step current and settling time of < 4 μs with the load step.  Therefore changed from TPS62421 to TPS62420 which allows one to provide the extra 0.05V.  TPS62420 fulfills the ripple requirement if forced into PWM mode, 500 mA step current looks OK but only by looking at graphs.

As there is no mention of settling time in datasheet could someone please tell me if TPS62420 fulfills the settling time of < 4 μs with the load step?

Thanks

  • 0
    TI__Guru*** 145450 points
    I'm not quite sure what they mean by settling time. Is this the time from the start of the transient until we're back into regulation or until we're back within 2%? The TPS62080 and TPS62085 use DCS-Control which has much better transient response.

    Let me know if I should move this to the WiFi forum for them to comment on how to read their spec.
  • 0 in reply to Chris Glaser
    Prodigy 220 points

    Yes please.

    Details are from Section 5.6.2 Preregulated 1.85 V on Page 50 of CC3200 SWAS032E –JULY 2013–REVISED JUNE 2014.

    In the meantime I will investigate the TPS62080/85 that you mentioned.


    Thank you

  • 0
    Prodigy 220 points

    Am closing this question because the two SN74AVC4T774RSVR Level Shifters and additional 32.768Khz Clock which my gadget requires when running the CC3200 in wide voltage 3.3V mode as opposed to 1.85 pre regulated mode add $3 and 113 sq mm to the BOM.  Well worth the cost and additional components to get away from power supply regulator issues and possible brown out issues that could happen if voltage dropped below 1.76 V.

    Sorry for bothering U.