Optimizing the Output Current for a DC-DC Converter

Abstract

Portable product design requires that power supply circuits use as little space as possible on the PC board, so highly integrated DC-DC converter devices are generally preferred. System designers need to understand the maximum amount of power that can be delivered by a given integrated circuit solution. Total output power capability is not only a function of the power converter IC, but also dependent on external components and operating frequency. This paper explores the relationship between a power converter’s rated switch current and its effective load current capability for two common DC-DC converter topologies, the non-isolated buck and boost circuits. By proper selection of external components and operating frequency, it is possible to maximize the output current available from a given power conversion device.

Keywords: Converters, switching frequency, buck, boost, inductor, components, switch, current.