Abstract
This paper presents a fast-locking delay-locked loop based (FLDLL) four-phase dc-dc converter with transient-modulated constant on-time control (TMCOT). Besides, the proposed converter can achieve inductor current balance through novel pulse-width-shrunk technique (PWST) automatically calibrating the duty cycle error and phase error of four-phase pulse-width modulation (PWM) signals in the DLL based multi-phase converters. In low-voltage and high-current load application, fast load transient response need to be further improved. Therefore, the proposed FLDLL includes an automatically switching single/dual triggered phase detector (ASS/DET-PD) to accomplish the fast–locking operation. The multi-phase buck converter operates at 10MHz, a load ranging from 0.4A to 1.4A, an input voltage of 3.3V, and an output voltage of 1.8V. These simulated results show that the output undershoot voltage and overshoot voltage both are below 10 mV, respectively. As well, these simulated recovery time in 1A step-up/down load both are 2.5µs, respectively. The fully-integrated circuit is implemented in TSMC 0.18-µm CMOS technology with 6.17 mm2 chip area, and it achieves 90.2% peak efficiency.
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