System modelling of an integrated hysteretic controlled DC-DC converter

Modelling of system components gains more and more interest in the design flow of integrated analog circuits. Digital parts are well described using e.g. Matlab Simulink or VHDL. On the other hand, analog circuits are complex to model and, therefore, its modeling is time consuming due to missing simulation speed-up or accuracy. Nevertheless, as system complexity rises and transistor level simulations nearly become impossible, adequate models of large integrated analog circuits, like DC-DC converters, are essential. This paper deals with a practical solution to model an integrated, hysteretic controlled DC-DC buck converter. The well known Texas Instruments TPS 62620 is used as an example. The consistency between the modelled chip and the datasheet is shown, while a simulation speed-up of about 30 has been achieved.