Abstract: A novel anti-jamming integrated CMOS current-sensing circuit for current-mode buck regulators is pre-sented. Based on the widely-used traditional current-sensing structure, anti-jamming performance is improved sig-nificantly by adding on-chip capacitors and one-shot circuit. Also the transient response is faster through the in-troduction of current offset. The circuit is concise, simple to implement and suits for SoC applications with single power supply. A dual-output current-mode DC-DC buck converter with proposed structure has been fabricated with a 0.5μm CMOS process for validation. In the 2.5–5.5 V input range, the two channels work steadily in the load current range of 0–600 mA. And the measured maximum efficiency is up to 96%.

Key words: buck regulators,  current-mode control,  current-sensing circuit,  anti-jamming