Implementation of a 16-Phase 8-Branch Charge Pump with Advanced Charge Recycling Strategy

Hui PENG  Pieter BAUWENS  Herbert De PAUW  Jan DOUTRELOIGNE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E103-C   No.5   pp.231-237
Publication Date: 2020/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2019ECP5029
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
8-branch charge pump,  charge recycling,  high efficiency,  low voltage ripple,  

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Summary: 
A fully integrated 16-phase 8-branch Dickson charge pump is proposed and implemented to decrease the power dissipation due to parasitic capacitance at the bottom plate of the boost capacitor. By using the charge recycling concept, 87% of the power consumption related to parasitic capacitance is saved. In a 4-stage version of this charge pump, a maximum power efficiency of 41% is achieved at 35µA output current and 11V output voltage from a 3.3V supply voltage. The proposed multi-branch charge pump can also reach a very low output voltage ripple of only 0.146% at a load resistance of 1MΩ, which is attributed to the fact that the 8-branch charge pump can transfer charges to the output node eight times consecutively during one clock period. In addition, a high voltage gain of 4.6 is achieved in the 4-stage charge pump at light load conditions. The total chip area is 0.57mm2 in a 0.35µm HV CMOS technology.