I need a little clarification in understanding the dropout voltage limits listed in the TPS7A4501-SP data sheet.
The parametric data for the 750 mA version shows a dropout of 0.27 V max at I = 500 mA with Vout = 2.4V.
The parametric data for the 1.5A version shows the dropout of 0.60V max at I = 500 mA with Vout = 19.3V.
Is this large difference in dropout due to the different operating point (output voltage) or due to difference in device design, or both?
Figure 1 shows typical dropout vs load current and temp, but doesn't specify which device and what the output voltage is. I assume it is the 1.5A device since the max current on the x-axis is 1.5A. This figure shows the typical dropout at max temp and 500 mA to be under 200 mV, which is much less than the 0.6 max shown in the parametric table, and even less than the typical value of 240 mV for 25 degC.
