Design of Boost DCDC Converter with
 Frequency Hopping at Light Load

Abstract

Abstract: This paper analyzes the high power conversion efficiency limit at full load range of traditional boost DCDC converter. Based on the analysis, light load detector and adaptive frequency hopping mechanism are put forward. The proposed technique doesn’t need additional pad and device while the load condition can be accurately detected in the Discontinuous Conduction Mode (DCM) of inductor current. The proposed boost DCDC converter is simulated in the CZ6H 0.35μm standard CMOS process, and results show that the proposed converter can adaptively select control frequency according to the load detector. At the load condition of 1 mA, power conversion efficiency can be up to 82%. System feedback loop can keep well stable within a wide range of load variation. For a load step of 1.5μA/20μs, the circuit has a maximum undershoot of 300mV and a maximum overshoot of 200mV. The recovery time is only 80μs and 60μs respectively，and the layout area is about 1.26mm2.

Key words: , transient response；phase margin；frequency hopping mode；inductor current sensor；power conversion efficiency

CLC Number:

TN 433

HU Jiajun,CHEN Houpeng,WANG Qian,LI Xi,MIAO Jie,LEI Yu,SONG Zhitang. Design of Boost DCDC Converter with
Frequency Hopping at Light Load[J]. Journal of Shanghai Jiaotong University, 2017, 51(6): 658-664.

References

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