Low power consumption switching circuit for MCU and its realization method

Abstract

The embodiment of the present application discloses a low-power switching circuit for MCU and its implementation method; it includes: a high-performance LDO circuit, a low-power LDO circuit and an MCU circuit; the high-performance LDO circuit includes a first amplifier, a first NMOS tube, first resistor, second resistor and first MCU power supply output; low power consumption LDO circuit includes second amplifier, adjustable resistor, fourth resistor, fifth resistor, first switch, second switch and second MCU power supply output terminal; the embodiment of the present application ensures that the output voltage of the low-power LDO circuit does not exceed the output voltage of the high-performance LDO circuit and the output voltage of the low-power LDO circuit can decline slowly and steadily during switching, avoiding the MCU switching to There is a risk of power-down in low-power working mode; at the same time, avoid the low-power LDO or high-performance LDO not being able to supply power normally when the MCU is switching between low-power mode and normal mode, resulting in the risk of power-down, and avoiding MCU circuit errors reset, and at the same time, the circuit structure is simple, the power consumption is low, and the realization cost is low.

Description

technical field [0001] The embodiments of the present application relate to the technical field of power management circuits, and in particular to a low-power consumption power switching circuit for an MCU and an implementation method thereof. Background technique [0002] MCU is a micro control unit, also known as a single-chip microcomputer or a single-chip microcomputer. Detection circuits such as digital converters, comparators, operational amplifiers, and even LCD drive circuits are integrated on a single chip to form a chip-level computer, which can be used for different combination controls for different applications. [0003] In recent years, with the great development of the Internet of Things and artificial intelligence, the difference between consumer electronics and computers has become smaller and smaller, and the functional requirements of consumer electronics have become higher and higher, and the design has become more and more complex. So many consumer elec...

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Problems solved by technology

[0005] The embodiment of the present application provides a low-power power supply switching circuit for MCU and its implementation method, so as to solve the risk of power failure when the MCU power supply is switched between high-performance LDO and low-power LDO in the prior art. So that the problem of MCU wrong reset

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