Fast load transient response and high power conversion efficiency in DC-DC converters have conflicting requirements on the size of the inductor. In this paper, an integrated point-of-load (POL) DC-DC converter with an smaller auxiliary output stage added in parallel to the main output switching stage to help reduce the output voltage deviation during load transient is investigated. The transistor sizing of the auxiliary output stage in relation to the main output stage is studied through analysis and simulation of a 12 V to 1 V, 3 W, buck converter. The auxiliary output stage performs well with transistors occupying as little as 5% the area of the main output stage.Index Terms -DC-DC converters, power management, smart power IC, switched mode power supplies, transient recovery.
-In this paper a transient suppression method applicable to integrated DC-DC converter is introduced. This method is designed for point-ofload applications where load current frequently varies. An auxiliary buck stage is added to a traditional buck stage that turns on only during transient to assist sinking or injecting load current. This helps swiftly to restore the output voltage to steady state and reduce transient variation. Simulation shows that for a 3W, 12V to 1V buck converter, this method effectively suppress the overshoot to be less than 3% when subjected to a 3A to 0A transient. This represents a 30% reduction in output voltage variations during transient comparing to control methods that only focus on fast recovery.
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