To improve the collection efficiency and environmental adaptability of PV cell, a high efficiency boost converter chip with MPPT function for PV cell was proposed. This circuit system included a new type of four-phase high efficiency charge pump module, an MPPT control circuit module which utilized a disturbance observation method, a feedback control module, a nA level current reference, and a detection circuit module. The chip was designed, simulated and manufactured in a 0.35 μm BCD process. The chip size was 3.15 mm×2.43 mm. The test results showed that when the PV cell output voltage was more than 0.5 V, the output voltage of the converter was raised to 3V_in, and the voltage conversion efficiency could reach 99.4%. The MPPT algorithm made the output power improve by 8.53%. When the output load current was 297 μA, the widest output PCE achieved 85.1%. The chip was highly efficient in boosting the output voltage of PV cells.