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TPS7A7001: Small VDO - graph versus max specs

Darren Jenkins
Genius 12481 points
Part Number: TPS7A7001

Hi LDO team,

A customer wants to use the TPS7A7001 in two places in a design.  From Figures 4 and 5, it looks alright, but the max VDO spec in section 6.5 is concerning.  Can you help confirm if the TPS7A7001 will work for this application?


T ambient is 0 to 70C.

1. 

Vin 1.5V,  Vout 1.31V,  0.8A

2.

Vin 1.5V, Vout 1.4V, 0.3A

Thanks,
Darren

  • 0
    TI__Guru 50025 points

    Hi Darren,

    It looks to me like both of these will work for this application because the EC table specs are over the full operating temperature range and over VOUT as well so the spec would be narrower for this use-case. However, it is difficult to say with certainty that it will work because we don't have data for this exact application. 

    Regards,

    Nick

  • 0 in reply to Nick Butts
    TI__Genius 12481 points

    Hi Nick,

    Is it accurate to say the graph is showing "typical" values for those conditions and not "max"?  If you look at 2A in the graph it is quite different from the EC table.

    What other conditions will cause the VDO to increase?  (temperature, current, ...)  I think understanding this aspect better will help confirm it will be alright in the customer's application.

    Thanks,
    Darren

  • 0 in reply to Darren Jenkins
    TI__Guru 50025 points

    Hi Darren,

    Yes the graphs show typical data.

    VDO increases with increasing current, and both of the customer's application requirements use lower load currents than are specified in the EC table, so they can expect the max dropout for ILOAD = 800mA and ILOAD = 300mA to be less than for the ILOAD = 1A case. From the graphs we can observe that VDO increases with increasing temperature as well, so they can expect the maximum ΔVDO to be less due to temperature changes than the EC table specs (which are over the full temperature range). 

    With these considerations it certainly appears that this part has the potential to fit the application, but in the end the customer will want to verify proper functionality themselves. 

    Regards,

    Nick