Apple Inc.
High voltage compatible push-pull buffer circuit

Abstract:

A voltage regulator having a buffer circuit and method for operating the same is disclosed. A voltage regulator having a buffer circuit includes an input stage coupled to receive an input voltage and an output stage configured to provide an output signal on an output node. The output stage includes first and second output transistors coupled to the output node. The circuit further includes a buffer stage coupled between the input and output stages. The buffer stage includes a first buffer transistor having a gate terminal coupled to the input stage and a source terminal coupled to a gate terminal of the first output transistor. The circuit further includes a first current mirror coupled to the first buffer transistor, and a second current mirror coupled to the first current mirror, the second current mirror including the second output transistor.