Abstract
A novel Under Voltage Lockout (UVLO) circuit featuring with fast response speed and low temperature coefficient threshold voltages is proposed in this paper. Compared with the conventional structure, the proposed circuit achieves the fast response ability thanks to the current-mode control technique is utilized. Meanwhile, this UVLO realizes hysteretic threshold by a feedback control path to improve the interference rejection capability. In addition, the threshold voltage varies slightly with the variation of the supply voltage and temperature by using a bandgap core. The proposed circuit implemented with 0.5μm BCD technology has an input high threshold voltage of 8.5V and a hysteresis of 1.5V, and start or shut off the power quickly. Test results verified that the proposed UVLO has the qualification to be applied to DC-DC converters.
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