Pre-charge technique for a voltage regulator

A method comprising:

• identifying a transition of a device from a low power mode to an active mode;
• responsive to identifying the transition, controlling a state of a first set of switches of a first controller of a voltage regulator to be open and controlling a state of a second set of switches of the first controller to be closed;
• initiating a pre-charge of a compensation network of the first controller, and pre-charging the compensation network to a predetermined state;
• and
• after pre-charging the compensation network to the predetermined state, causing the first controller to control the voltage regulator in place of a second controller of the voltage regulator.

An integrated circuit comprising:

• a sensor circuit to sense information;
• a radio circuit to wirelessly transmit at least some of the sensed information;
• and
• a voltage regulator to provide a regulated voltage to the sensor circuit and the radio circuit, the voltage regulator comprising:
• a power train having one or more first power switches to be controllably coupled between a first voltage node and a switching voltage node and one or more second power switches to be controllably coupled between the switching voltage node and a second voltage node, the power train to output the regulated voltage, the power train comprising:
• a power logic;
• a first current limiter to provide a first current limit signal to the power logic, responsive to a first current from the first voltage node to the switching voltage node exceeding a first threshold level;
• and
• a second current limiter to provide a second current limit signal to the power logic, responsive to a second current from the switching voltage node to the second voltage node being greater than a second threshold level, wherein the power logic is to perform a cycle-to-cycle current limit control based on the first and second current limit signals;
• a first controller to control the power train in a first mode of operation corresponding to an active mode of operation, the first controller comprising:
• a compensator having a first input terminal to receive the regulated voltage and a second input terminal to receive a reference voltage and an output node to output an error signal based on a comparison, the compensator including a compensation network to be pre-charged to a pre-charge level when the first controller is to be enabled;
• and
• a comparator circuit coupled to the compensator, the comparator circuit to compare the error signal to a ramp signal and to generate a first control output to control the power train in the first mode of operation;
• and
• a second controller to control the power train in a second mode of operation, the second mode of operation corresponding to a low power mode of operation.