Patent ID: 7486127
Filing Date: 2009-02-03
Classification: H03K

Abstract:
1. An electronic circuit device comprising: a switching transistor having a gate terminal, a voltage source side terminal and an output terminal; a load impedance coupled to the output terminal; a voltage source connected to the voltage source side terminal; a gate input that selectively turns the switching transistor on or off based on voltage potential of the gate input relative to a threshold voltage that is required for the switching transistor to turn on; means for automatically and dynamically connecting a body of the switching transistor to a highest potential voltage among a first potential voltage at the voltage source side terminal and a second potential voltage at the output terminal, wherein said means automatically pulls the body of the switching transistor to the first potential voltage when the first potential voltage is greater than the second potential voltage and said means automatically pulls the body of the switching transistor to the second potential voltage in response to the second potential voltage becoming greater than the first potential voltage, whereby latch-up of the switching transistor is averted when the output terminal has a higher voltage than the voltage source side terminal; wherein said means for automatically and dynamically connecting comprises: