Design of LDO with Thermal Over-Current and Over-Voltage Protection

a kind of LDO with thermal protection,over-current protection and over-voltage protection is designed, and the main loop circuit increases a zero for frequency compensatioa The circuit is designed based on CSMC 2μm Bipolar process and simulated with Hspice.Simulation results shows that thermal protection could achieve protection for the circuit.When the temperature is higher than 140℃,thermal protection circuit would shut off the regulator,and when the temperature drops down to 105℃,the LDO works again.The maximum output current is 5A,and when output current exceeds the maximum output current,over-current protection circuit would shut off the regulator.When load ranges from 10mA to 5A,Changes in the output voltage does not exceed 32mV;When input voltage ranges from 3.8V to 6V,Changes in the output voltage does not exceed 3mV.