Abstract
A digitally controlled dual-mode buck converter using low quiescent current is proposed in this work. In particular, the proposed dual pulse-skipping mode adopts a pulse-skipping adaptive on-time (PSAOT) mode for heavy load; and a pulse-skipping asynchronous mode (PSAM) for light and ultra-light loads to achieve a 100,000X wide load range for the Long-range (LoRa) application. Specifically, the pulse-skipping mode selector adopts a digital logic circuit to realize the 180nA low quiescent current. In addition, a low-power dynamic comparator with an adjustable offset is used to accelerate the transient response. The proposed converter is fabricated in a TSMC 350 nm CMOS process and results in an output voltage of 3.3 V from 5V to 4.2 V input voltage range. These results show that the overall system achieves 92.9 % peak eficiency at 8 mA output load and a figure of merit (FoM) of 2.29.
| Original language | English |
|---|---|
| Pages (from-to) | 1-9 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Circuits and Systems I: Regular Papers |
| DOIs | |
| State | Accepted/In press - 2023 |
Keywords
- Adaptive-on-time (AOT)
- Buck converters
- Detectors
- digital control power converter
- dual-mode
- Hysteresis
- Inductors
- long-range (LoRa) applications
- pulse-skipping modulation (PSM)
- Switches
- Transient response
- ultra-low power
- Wireless sensor networks