Low dropout regulator with hysteretic control

摘要

An output stage has an input supply node to receive an input power supply and an output node to provide an output supply to a load. An amplifier is used to control current strength of the output stage according to the output supply and a reference voltage. A hysteresis unit is used to monitor the output supply and operable to control the current strength of the output stage according to a voltage level of the output supply. In one embodiment, a plurality of charge pumps are used to adjust current strength of the output stage. A logic unit is used to monitor the output supply and operable to control the plurality of charge pumps according to a voltage level of the output supply and one or more reference voltages.

主权项

1. An apparatus comprising:
an output stage comprising
an input supply node to receive an input power supply,a multiplexer comprising a first input coupled to the input supply node, a second input, a select input and an output; andan output node coupled to output of the multiplexer to provide an output supply to a load;an amplifier coupled to the second input of the multiplexer to control the output stage according to the output supply and a reference voltage; and a circuit to monitor the output supply coupled to the select input of the multiplexer that is operable to provide a digital control of the output stage according to a voltage level of the output supply.