ZHCSIK3 July 2018 TPS650861
PRODUCTION DATA.
To design a 5-V input application, first provide a step-up voltage from the 5-V input to the VSYS. Design the step-up to output a voltage near 5.8 V. Next, route the 5-V input to the controller and converter VINs. Thus, all power paths (all high currents) are routed through the controllers or directly to the converters. None of the high currents are required from the step-up supply. After the input stage is complete, the rest of the system can be designed as normal following the typical application procedure, using 5 V as the input value to the controllers.