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Voltage regulation circuit with reverse connection protection

A voltage adjustment circuit and circuit technology, which is applied in emergency protection circuit devices, electrical components, and electrical variables adjustment, etc., can solve the problems of large chip area and high cost, and achieve the effect of high cost performance, application cost saving, and chip area saving.

Inactive Publication Date: 2021-05-25
厦门顺福芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the traditional voltage adjustment circuit generally provides a reference voltage generated by the bandgap reference circuit as a reference voltage to stabilize the output of the voltage adjustment circuit. The generation circuit of the reference voltage needs to occupy a large chip area and the cost is relatively high.

Method used

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  • Voltage regulation circuit with reverse connection protection

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Embodiment Construction

[0010] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0011] like figure 1 As shown, a voltage adjustment circuit with reverse connection protection includes a start-up circuit, a self-bias circuit and a voltage adjustment main circuit; the start-up circuit is composed of N-type field effect transistors MN1, MN2 and P-type field effect transistor MP1. During the power-on process of the circuit, the start-up of the bias circuit is realized. The channel length of the P-type field effect transistor MP1 is much larger than the channel width. It is an inverse ratio tube, and the starting current when it is powered on is very small, which reduces the static current consumption of the circuit. N-type field effect transistors MN1 and MN2 form a current mirror structure. During the power-on process, the drain of N-type field effect transistor MN2 gives a low-level signal to P-type field effect transistor...

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PUM

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Abstract

The invention discloses a voltage regulation circuit with reverse connection protection. The voltage regulation circuit comprises a starting circuit, a self-biasing circuit and a voltage regulation main body circuit; the voltage adjusting main body circuit is composed of a diode D0, an error amplifier I0, a P-type field effect transistor MP0, an N-type field effect transistor MN5, a current source and resistors R1 and R2 of the same type in proportion; the anode of the diode D0 is connected to a chip power supply port VDD, and the cathode of the diode D0 is connected with the source electrode of the P-type field effect transistor MP0. The inverted input end of the error amplifier I0 is connected between a P-type field effect transistor MP2 and an N-type field effect transistor MN3 in the self-biased circuit, the in-phase input end of the error amplifier I0 is connected between the resistor R1 and the resistor R2, and the output end of the error amplifier I0 is connected with the grid electrode of the P-type field effect transistor MP0. According to the invention, the diodes are integrated in the chip, so that power supply reverse connection protection is achieved; and meanwhile, compared with a band-gap reference circuit, the voltage regulation circuit has the advantages that the reference voltage generating circuit with a self-bias structure is adopted, so that the chip area is saved, and the cost performance is high.

Description

technical field [0001] The invention relates to a voltage adjustment circuit, and in particular provides a voltage adjustment circuit with reverse connection protection. Background technique [0002] Ordinary integrated circuit chips are easy to damage the chip when the ground terminal and the power terminal of the chip are confused and reversed by improper use. The traditional method is to connect a protective diode externally to the power supply end of the chip to prevent the chip from being burned when the external power supply is reversed. In addition, the traditional voltage adjustment circuit generally provides a reference voltage generated by a bandgap reference circuit as a reference voltage to stabilize the output of the voltage adjustment circuit. The generation circuit of the reference voltage needs to occupy a relatively large chip area and is expensive. Contents of the invention [0003] In order to solve the above problems, the object of the present inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/569H02H11/00
CPCG05F1/569H02H11/002
Inventor 刘玉山张梁堂刘玉龙
Owner 厦门顺福芯科技有限公司
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