Abstract-This paper describes a complete digital PWM controller IC for high-frequency switching converters. Novel architecture and configurations of the key building blocks are A/D converter, compensator, and digital pulse-width modulator, are introduced to meet the requirements of tight output voltage regulation, high-speed dynamic response, and programmability without external passive components. The implementation techniques are experimentally verified on a prototype chip that takes less than 1 mm 2 of silicon area in a standard 0.5 digital complementary metal oxide semiconductor (CMOS) process and operates at the switching frequency of 1 MHz.Index Terms-DC-DC switch-mode power conversion, digital control, digital pulse width modulation.

This paper describes complete design and implementation of a digital controller for a high-frequency switching power supply. Guidelines for the minimum required resolution of the analog-to-digital converter, the pulse-width modulator, and the fixed-point computational unit are derived. A design example based on a buck converter operating at the switching frequency of lMHz is presented. The controller design is based on direct digital design approach and standard root-locus techniques. Experimental results are shown to validate the design approach and the allocation of resources (resolution) in the implementation.

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