JAJSDD4B July 2017 – January 2019 TPS7A92
PRODUCTION DATA.
Dropout voltage (VDO) is defined as the VIN – VOUT voltage at the rated current (IRATED) of 2 A, where the pass-FET is fully on and in the ohmic region of operation. VDO indirectly specifies a minimum input voltage above the nominal programmed output voltage at which the output voltage is expected to remain in regulation. If the input falls below the nominal output regulation, then the output follows the input.
Dropout voltage is determined by the RDS(ON) of the pass-FET. Therefore, if the LDO operates below the rated current, then the VDO for that current scales accordingly. The RDS(ON) for the TPS7A92 can be calculated using Equation 1: