Anti-backflow protection module, low dropout linear regulator, chip and power supply system

Abstract

The invention provides an anti-backflow protection module, a low dropout linear regulator, a chip and a power supply system, and the module comprises a backflow detection unit which generates a detection signal based on input and output voltages; a voltage dividing unit which is connected between the input voltage and the source electrode of the first PMOS tube; a first PMOS tube, wherein the drain electrode of the first PMOS tube is connected with output voltage, and the gate electrode is connected with the output end of the backward flow detection unit; a second PMOS tube, wherein the drain electrode of the second PMOS tube is connected with the grid electrodes of the third PMOS tube and the fourth PMOS tube, the source electrode is connected with the source electrode of the first PMOS tube, and the gate electrode is connected with the output end of the voltage division unit; a third PMOS tube, wherein the drain electrode of the third PMOS tube is connected with the input voltage, the source electrode and the substrate are connected with the source electrode and the substrate of the fourth PMOS tube, and the gate electrode is connected with a driving signal; a fourth PMOS tube, wherein the drain electrode of the fourth PMOS tube is connected with the output voltage, and the gate electrode is connected with the driving signal. The module is applied to the interior of a fully-integrated LDO linear voltage regulator chip, and the complexity of an external circuit is not increased; the module is suitable for a thin gate process that the gate-source withstand voltage of the MOS tube is only 5V, and a chip can be effectively protected when the output end is connected with the highest 20V potential; and the energy consumption of the standby power supply is reduced in practical application.

Description

technical field [0001] The invention relates to the field of power management, in particular to an anti-backflow protection module, a low-dropout linear voltage regulator, a chip and a power supply system. Background technique [0002] With the rapid development of 5G and the Internet of Things, various electronic devices are constantly being upgraded, and the demand is also increasing. This type of electronic equipment generally does not use the direct power supply of the grid, but converts the external high voltage into a low voltage through a transformer and a switching power supply, and then obtains an accurate and stable power supply voltage through an LDO linear regulator. Therefore, since the birth of the LDO linear regulator in the last century, it has always occupied an important position in the analog chip, and its research and improvement in low noise, low dropout, etc. have continued to this day. [0003] While the external voltage supplies power to the device t...

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Problems solved by technology

[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an anti-backflow protection module, a low-dropout linear voltage regulator, a chip and a power supply system, which are used to solve the problem of the small application range of the anti-backflow protection scheme in the prior art, High energy consumption and other issues

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