Patent ID: 7199643
Filing Date: 2007-04-03
Classification: H02M

Abstract:
1. A hot swappable pulse width modulation switching regulator controller comprising: a hot swap transistor having a control terminal; a pulse width modulation circuit coupled in series with the hot swap transistor, the pulse width modulation circuit including a pulse width modulation control circuit coupled to at least one switching transistor for switching the switching transistor on and off at a frequency determined by the pulse width modulation control circuit; a hot swap circuit coupled to a control terminal of the hot swap transistor; the hot swap circuit, when the hot swap circuit and the series combination of the hot swap transistor and the pulse width modulation circuit are coupled to a source of power having a power source voltage, turning on the hot swap transistor by changing a voltage on the control terminal at a controlled rate in spite of the sudden application of power to the hot swappable pulse width modulation switching regulator controller, and maintaining the hot swap transistor on until the hot swappable pulse width modulation switching regulator controller is no longer coupled to a source of power having the power source voltage; the pulse width modulation circuit and the hot swap circuit being in a single integrated circuit.