Patent ID: 8581568
Filing Date: 2013-11-12
Classification: H02M

Abstract:
1. A method for turning on or off an integrated circuit device, comprising: receiving supply voltage from a high voltage source; receiving a first reference voltage across a Zener diode coupled between a high voltage source and a low voltage source; turning on the integrated circuit device responsive to a first scaled version of the supply voltage exceeding the first reference voltage; turning off the integrated circuit device responsive to a second scaled version of the supply voltage dropping below a second reference voltage generated at a bandgap circuit; providing current in the bandgap circuit by a first current generator for a first time period after the first scaled version of the supply voltage exceeds the first reference voltage; providing current in the bandgap circuit by a second current generator for a second time period after the first time period, the second current generator having current regulating characteristics better than the first current generator; and providing current in the bandgap circuit by the first current generator and the second current generator for a third time period after the first period and before the second time period.