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These devices are designed to have a fast transient response and be stable with 10-µF low ESR capacitors. This combinaTIon provides high performance at a reasonable cost.
Because the PMOS device behaves as a low-value resistor, the dropout voltage is very low (typically 230 mV at an output current of 1 A for the TPS76750) and is directly proporTIonal to the output current. AddiTIonally, since the PMOS pass element is a voltage-driven device, the quiescent current is very low and independent of output loading (typically 85 µA over the full range of output current, 0 mA to 1 A). These two key specificaTIons yield a significant improvement in operating life for battery-powered systems. This low-dropout (LDO) family also features a sleep mode; applying a TTL high signal to enable (EN) input shuts down the regulator, reducing the quiescent current to 1 µA at TJ = 25°C.
