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This paper introduces a control scheme for hysteretic power converters that results in a spur-free switching noise spectrum irrespective of the actual switching frequency of the converter. The proposed control scheme enables powering noisesensitive loads directly from hysteretic converters without requiring the rather complicated switching frequency control loops that have been traditionally employed within hysteretic power converters in order to maintain a constant and predictable switching frequency and switching noise spectrum. Therefore, the key advantages of hysteretic power converters, i.e. simple design, cost-effective implementation and fast transient response, can be preserved by eliminating any additional frequency control overhead. A step-down buck converter is used to demonstrate the proposed control scheme.

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Two methods are presented for finding steady-state solu-