468 / 2019-02-27 21:34:40

Design of a Low Temperature Drift UVLO Circuit with Base Current Compensation

Under Voltage Lock Out; Base Current Compensation; Low Temperature Drift

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A novel Under Voltage Lock Out (UVLO) circuit is proposed in this paper. Compared with traditional bandgap structure UVLO, base current generation and compensation circuits are introduced in this designed UVLO circuit to gain better performance, especially with ultra-low β. So the temperature drift of VTH can be minimized, an accurate threshold voltage (VTH) can be achieved. It is designed by using 0.18μm 5V CMOS process. The simulation results show that the VTH in the proposed circuit is 3.380V, and its deviation is 49mV in the temperature range of -40~125°C.