Over-Temperature Protection for a Switched-Capacitor DC-DC Converter with Controlled Charging Current

Abstract

This paper presents an over-temperature protection (OTP) circuit for a DC-DC converter based on switching capacitors (SC DC-DC). The circuit was designed by using a two-step approach that encompasses running both electrical and electro-thermal simulations. The die temperature distribution was analyzed for two critical operational scenarios in order to identify the worst case and to provide design data for implementing a robust and precise OTP. Finally, a design example of a SC DC-DC with OTP is presented in some detail, complete with the key electrical and electro-thermal simulation results.