# A 0.18-μm BCD Adaptive-On-Time Buck DC-DC Converter with 96.03% Peak Efficiency and 100% Duty Cycle

## TL;DR

This paper introduces a highly efficient buck DC-DC converter with 96.03% peak efficiency and full duty cycle support.

## Contribution

The novel HEAOT–Buck converter achieves 100% duty cycle and high efficiency using a 0.18 µm BCD process.

## Key findings

- The converter achieves 96.03% peak efficiency at 0.5 A load.
- Output voltage regulation remains within 0.36% when load current varies from 0.1 to 1 A.
- The output voltage settles within 10 µs during load transients.

## Abstract

This paper proposes a high-efficiency adaptive-on-time buck DC-DC converter (HEAOT–Buck) capable of supporting a 100% duty cycle. The converter operates over an input voltage range of 3–18 V and provides an adjustable output voltage from 0.9 to 5.5 V, delivering up to 1 A load current. Implemented using a 0.18 µm BCD process, the chip attains a peak efficiency of 96.03%. When the load current changes from 0.1 to 1 A, the output voltage regulation remains within 0.36%, while the line regulation below 0.55%. At a switching frequency of 2.5 MHz and a 0.5 A load condition, the output voltage ripple measures at approximately 22 mV. Under a load transient from 0 to 1 A, the output voltage settles within 10 µs.