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TPS7B7702-Q1: Dropout voltage vs. Output current

Shinji Tsuji
Genius 12338 points
Part Number: TPS7B7702-Q1

Hi team,

1. I think the Figure7 is a typical data. How much worst case tolerance should I consider for the dropout voltage? 

2. Is there "Dropout voltage vs Output current" for VIN=8V to 10V available?

3. If not, how much does it change over VIN?

regards,

  • +1
    TI__Mastermind 37965 points

    Hi Shinji,

    1) You are correct, Figure 7 is typical data. The EC table states that at Iout = 100mA the maximum dropout voltage is 500mV over the full temperature range. Figure 7 says that the typical dropout voltage for Iout = 100mA is about 400mV. So, the maximum dropout is about 25% larger than the typical specification at 125C. If we assume this is always roughly true then we can take the worst-case as 25% larger than the 125C curve in Figure 7. There is some extra margin added here because the EC table actually specifies up to 150C while the part is intended to be used up to 125C, so although this is a hand-wavy argument I think it should be good enough to set an upper bound. 

    2) We do not have this data.

    3) Dropout voltage is not dependent on Vin; it is dependent on load current and junction temperature. 

    Regards,

    Nick