Reactive PL4 with PL4 Boost

2S (two cells in series) battery systems, while being efficient in power conversion, are at risk of "brownout" during peak power events, hence they tend to request lower PL4 levels. This PL4 level fluctuates depending on the remaining state of charge (RSOC) of the battery.

The system can implement the Reactive PL4 mechanism called "PL4 Boost" given the:

1. Effective capacitance on V_SYS
2. Power removal reaction speed due to a system rail undervoltage event.

The Processor uses PL4 Boost to calculate a higher performance frequency with a potentially higher P_max than the programmed PL4 value. Upon IMVP PROCHOT# assertion, the programmed PL4 level is respected. Oscillatory assertions are addressed when identified.

The PL4 Boost feature enables higher peak performance and/or responsiveness for 2S battery systems in low remaining state of charge (RSOC) conditions. Responsiveness gains are a result of the Processor using higher frequency states while having a reactive mechanism in place to quickly reduce loading.

Using 2S batteries allows for the most efficient power conversion and battery density per volume versus 3S batteries, however, in low RSOC conditions there is risk of brownouts due to system rail voltage droop when using high PL4 setting .