93.89% Peak Efficiency 24V-to-1V DC-DC Converter with Fast In-Situ Efficiency Tracking and Power-FET Code Roaming.

Zhaoqing Wang, Mao Li,Suhwan Kim,Nachiket V. Desai, Ram K. Krishnamurthy, Orlando Lazaro, Andres Blanco,Xin Zhang,Mingoo Seok

ESSCIRC(2023)

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摘要
This paper presents a high-efficiency 24V-to-1V buck converter featuring two techniques to improve efficiency and reliability. First, we propose a fast in-situ efficiency tracking technique, which helps to maintain high power efficiency across load conditions and process, voltage, and temperature variations. Second, we propose a power-FET code roaming technique to avoid excessive aging on specific segments. The proposed converter was fabricated in a 180nm BCD process, achieving a peak power efficiency of 93.89% at 405-mA load current. The tracking technique demonstrates an efficiency improvement of up to 34.74% compared to the baseline without efficiency tracking. In addition, the roaming technique slows down the on-time resistance degradation by 5.8X.
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关键词
DC-DC converter, efficiency tracking, LUT-based control, gradient descent, code roaming, reliability enhancement
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