High Efficiency CMOS Switching Regulator For Low Power Application
Date Issued
2009
Date
2009
Author(s)
Chen, Yen-Chou
Abstract
A high efficiency PFM mode buck switching regulator with additional current sensing feedback is designed in this thesis. The PFM mode switching regulator has better performance in light load than the PWM mode switching regulator. Compared with PWM mode, the PFM mode costs less quiescent current in the circuit design. We used the PFM mode only since the maximum designed load current is under 500mA for low power applications. By using the current sensing feedback loop can fine tune the voltage controlled ring oscillator dynamically under load current variation. Simulation results compare the performance of switching regulator with or without the current sensing feedback loop. This design is implemented by TSMC 2P4M 0.35μm 3.3V/5V mixed signal CMOS process. The conversion efficiency could be up to 90%. The range of the operation voltage is from 2.4V to 5V. The line regulation is 0.625%/V and the load regulation is 0.028%/mA. The maximum quiescent current is 26μA.
Subjects
switching regulator
buck
DC-DC
PFM
low power
Type
thesis
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ntu-98-J95921041-1.pdf
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