A 2 MHz 12–100 V 90 Efficiency Self-Balancing ZVS Reconfigurable Three-Level DC-DC Regulator With Constant-Frequency Adaptive-On-Time V2 Control and Nanosecond-Scale ZVS Turn-On Delay

摘要

This paper presents a miniaturized wide-input-range integrated reconfigurable three-level dc-dc voltage regulator. A three-level buck converter topology with zero-voltage switching (ZVS) is adopted to remove the dominant switching power loss under high-input-voltage condition, thereby enabling the converter to achieve high power efficiency in the megahertz range and reduce the required values of power passives. A constant-frequency adaptive-on-time V2 control is proposed to not only regulate the output voltage, but also offer the flying capacitor self-balancing in the megahertz range and over a wide input range for improving the converter reliability. A body diode-based floating ZVS detector is also developed to enable full-ZVS operation of power transistors in high-frequency low duty-ratio conditions with ≤5 ns ZVS turn-on delay. Implemented in a 120 V 0.5 μm CMOS process, the proposed voltage regulator uses four 50 V on-chip power nMOS to support an input voltage from 12 to 100 V and regulates the output voltage at 10 V with a maximum output power of 5 W. The proposed regulator achieves a maximum power efficiency of 90% under the nominal 48 V input and 2 MHz switching frequency. Compared with the state-of-the-art counterparts, the proposed regulator provides 66 times and 2.6 times reductions in the inductance and the total capacitance, respectively.