Abstract: A DC-DC voltage conversion provides a voltage to a processor in a mobile computer system using a high side power FET and a low side power FET, each having a variable gate discharge time dependent on the applied battery voltage. The power FETs are arranged in a synchronous totem pole configuration with a junction point therebetween, coupled between a voltage input terminal and ground, with the junction point coupled to a voltage output terminal. Each of the power FETs is driven by a FET driver, with the driver being coupled to the output of a comparator comparing a reference voltage with the output voltage. To avoid cross-conduction, the high side power FET and the low side power FET are coupled to each other in such a manner that the event of one turning off will turn on the other after a dead time determined by the threshold sense circuit, plus delays of the devices used in the embodiment.

Abstract: A switching regulator circuit comprises a drive circuit, a switching transistor, an output stage and a pre-drive circuit that are coupled in series. The pre-drive circuit is coupled to the drive circuit to apply a pre-drive signal which varies the duty cycle and frequency of a series of drive pulses which activate and deactivate the switching transistor thereby adjusting a voltage of the switching regulator circuit. The pre-drive circuit utilizes a comparator in combination with a hysteresis network to vary the oscillation frequency of the pre-drive signal.