7.1 Overview

The TPSM82480 is a high efficiency synchronous switched mode step-down converter module based on a 2-phase peak current control topology. It is designed for smallest solution size low-profile applications, converting a 2.4 V to 5.5 V input voltage into a lower 0.6 V to 5.5 V output voltage. While an outer voltage loop sets the regulation threshold for the inner current loop, based on the actual V_OUT level, the inner current loop regulates to the actual peak inductor current level for every switching cycle. The regulation network is internally compensated. While the ON-time is determined by duty cycle, inductance and cycle peak current, the switching frequency of typically 2.2 MHz is set by a predicted OFF-time. The device features a Power Save Mode (PSM) to keep the conversion efficiency high over the whole load current range.

The TPSM82480 is a 2-phase converter, sharing the load among the phases. Identical in construction, the second phase control is connected with an adaptive delay to the first phase. Both the phases use the same regulation threshold and cycle-by-cycle peak current setpoint. This ensures a phase-shifted as well as current-balanced operation. Using the advantages of the 2-phase topology, a 6-A continuous output current is provided with high performance and as small as possible solution size.