Patent ID: 9705318
Date: 2017-07-11
CPC Classifications: H01L,H02H

Claim:
1. An apparatus, comprising: an isolated p-well region of a semiconductive material; a snap-back circuit coupled to a node and configured to discharge a first over-voltage condition when triggered responsive to a first trigger condition and further configured to discharge a second over-voltage condition through an n-channel transistor when triggered responsive to a second trigger condition; a first circuit configured to modulate the first trigger condition of the snap-back circuit; a second circuit configured to modulate the second trigger condition of the snap-back circuit, wherein the second trigger condition is different than the first trigger condition; and a control circuit coupled to a reference node and to the isolated p-well region, the control circuit further coupled to the first and second circuits and configured to modulate both the first and second trigger conditions, wherein the second trigger condition is modulated by controlling at least one of a gate condition and a channel condition of the n-channel transistor.