Patent ID: 6859089
Filing Date: 2005-02-22
Classification: H03K

Abstract:
1. A power switching circuit, comprising: a power switching transistor, having a source and a drain defining a source/drain path connected on a first side to an input of the power switching circuit and connected on a second side to an output of the power switching circuit, having a gate coupled to a control line of the power switching circuit, and having a body node; a first body node switching transistor, having a source/drain path connected between the body node and the first side of the source/drain path of the power switching transistor, and having a gate; a second body node switching transistor, having a source/drain path connected between the body node and the first side of the source/drain path of the power switching transistor, and having a gate; a comparator, for comparing the voltage at the input of the power switching circuit to the output of the power switching circuit, the output of the comparator coupled to the gate of the second body node switching transistor; and an inverter, biased between the output of the power switching circuit and circuit ground, having an input coupled to the output of the comparator, and having an output coupled to the gate of the first body node switching transistor, for applying a voltage at the gate of the first body node switching transistor corresponding to the output of the power switching circuit responsive to the voltage at the output of the power switching circuit being higher than the voltage at the input of the power switching circuit.