ZHCSSB2G march 2008 – june 2023 TPS799-Q1
PRODUCTION DATA
The TPS799-Q1 uses a PMOS pass transistor to achieve low dropout. When (VIN – VOUT) is less than the dropout voltage (VDO), the PMOS pass transistor is in the linear region of operation and the input-to-output resistance is the RDS, ON of the PMOS pass transistor. Because the PMOS transistor behaves like a resistor in dropout, VDO scales approximately with output current.
As with any linear regulator, PSRR and transient response are degraded as (VIN – VOUT) approaches dropout. This effect is illustrated in Figure 6-7 through Figure 6-9 in the Typical Characteristics section.