Method and apparatus for stable battery-powered supply modules

A system, comprising:

• a first device configured to receive an input voltage of a circuit via a first analog to digital converter (ADC), configured to provide a digitized input voltage, and to receive an output voltage of the circuit via a second ADC, configured to provide a digitized output voltage, and to determine a first threshold level for the circuit to operate in a pulse frequency modulation (PFM) mode based on the digitized input voltage and the digitized output voltage;
• a second device configured to receive the input voltage and the output voltage and to determine a second threshold level for the circuit to operate in the PFM mode based on the input voltage and the output voltage;
• and
• a timer configured to receive the first threshold level and the second threshold level and to select, based on an expiration time of the timer, one of the first threshold level or the second threshold level for the circuit, wherein before the timer expires, the second threshold level is selected, and wherein in response to the timer expiring, the first threshold level is selected.

A system, comprising:

• a booster circuit configured to receive an input voltage and to provide an output voltage greater than the input voltage;
• an input node configured to receive a first threshold level for the booster circuit to operate in a pulse frequency modulation (PFM) mode;
• a second device coupled to the booster circuit and configured to receive the input voltage and the output voltage and determine a second threshold level for the booster circuit to operate in the PFM mode;
• and
• a selector device configured to receive the first threshold level and the second threshold level and configured to select one of the first threshold level or the second threshold level for the booster circuit.