Temperature protection circuit is an essential part of LDO,ensuring LDO and its load circuit working in suitable temperature range,preventing circuit from breaking down due to overheat.This paper presents a temperature protection circuit applied to LDO,turning off the circuit when temperature is too high.Based on the temperature characteristic of base-emitter voltage of bipolar junction transistor(BJT),the temperature protection circuit invert the output of comparator generating control signal to adjust gate voltage of pass transistor while overheat.The proposed circuit is fabricated in 0.18μm CMOS process and experimentally verified by Spectre.Simulation results show that LDO is turned off when temperature is higher than 130℃and turned on when temperature is lower than 105℃.The temperature hysteresis is 25℃.The simulation results of process angle show that the temperature protection circuit is stable.
维普
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