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Original question:

TPS61091: TPS61090, TPS61091, TPS61092 reverse current?

TPS61090: Is there a limitation between VBATT and VOUT?

Lauren Mayfield
Expert 7290 points
Part Number: TPS61090

Hi team,

I was wondering if there was any limitation or headroom needed between the input voltage and output voltage. Ie if there was a headroom of 0.5V, and Vout is 5.5V, Vin can't be greater than 5V. Is this the case for this part?

Also, is there a pass through feature so that when Vin > Vout, Vout = Vin?

Lastly, this is being used for a non-battery application (5V to 5.5V). Is there any concern with that (datasheet mentions this is for battery-powered applications).

Thanks!
Lauren

  • +1
    TI__Expert 8075 points

    Hi Lauren,

    There is no required gap between Vin and Vout . But when Vin is very close to Vout , the High side FET conducting time is longer  and the Vout ripple will be larger. There is no pass through mode. But when Vin is higher than vout, the high side fet body diode is conducting, which is  not the same way with pass through. In this case, Vout=Vin-0.7V.

    Also, 5v converting to 5.5V is okay.