The core of the integrated design of lithium batterycharging and discharging lies in achieving intelligent two-way energy regulation. The circuit adopts a synchronous step-up and step-down architecture composed of MOSFET and inductors. During charging, it reduces the voltage to 4.2V for constant voltage, and during discharging, it increases the voltage to 12V for output. The key breakthrough point is an energy conversion efficiency of over 85%, achieved through zero-voltage switching technology to reduce switching losses, and keeping the system temperature rise within 40℃. 

Voltage Monitoring: Real-time detection of deviations in individual battery cells. If the deviation exceeds ±50mV, automatic equalization will occur. 

Temperature protection: The surface-mounted NTC sensor, combined with software algorithms, provides an accuracy warning of ±2℃. 

Current management: The integrated Hall sensor provides overcurrent protection response, with activation time less than 10 microseconds. 

Automatically switch working modes based on load identification: In light load conditions, use pulse frequency modulation (PFM) to maintain an efficiency of 80%, and in heavy load conditions, switch to pulse width modulation (PWM) to achieve a peak efficiency of 92%. The unique hybrid modulation technology reduces standby power consumption to 15 μA, enhancing battery life by three times compared to traditional solutions.