Its pin parameter is the voltage output range is 1.1V-1.85V, the switching frequency is 80KHz. Input voltage range is 2.7V ~ 5.5V, main frequency 3600. The range of switching power supply chips is relatively broad, including power conversion (DC-DC, AC-DC, and DC-AC), power distribution and detection, and systems that combine power conversion and power management. The classification of power management chips includes linear power supply chips, voltage reference chips, switching power supply chips, LCD driver chips, LED driver chips, voltage detection chips, and battery charge management chips