Texas Instruments TPS770 LDO Linear Voltage Regulators

A combination of new process innovation and circuit design has enabled the usual PNP pass transistor to be replaced by a PMOS pass element. The dropout voltage is very low because the PMOS pass element behaves as a low-value resistor, typically 35mV at 50mA of load current (TPS77050), and is directly proportional to the load current. Since the PMOS pass element is a voltage-driven device, it is stable over the entire range of output load current (0mA to 50mA), and the quiescent current is ultra-low (28uA maximum). Intended for use in portable systems such as cellular phones and laptops, the ultra-low dropout voltage feature and ultra-low power operation significantly increase the system's battery operating life.

The Texas Instruments TPS770 also reduces quiescent current to 1uA, typically at T_J = 25°C, with a logic-enabled sleep mode to shut down the regulator. The TPS770 is offered in 1.2V, 1.5V, 1.8V, 2.5V, 2.7V, 2.8V, 3.0V, 3.3V, and 5V fixed-voltage versions and a variable version (programmable over the 1.2V to 5.5V range).