A ldo circuit suitable for wide input voltage range

Abstract

The invention discloses an LDO circuit suitable for a wide range of input voltages, which includes an IC chip, an input voltage VIN terminal and other application circuit modules arranged on the IC chip, and also includes a voltage dividing module and a bandgap module arranged on the IC chip. A reference voltage generating module, a comparator U2 and a switch control module; the non-inverting input terminal of the comparator U2 is connected to the input voltage VIN terminal through a voltage divider module, and the inverting input terminal of the comparator U2 is connected to the bandgap reference voltage generating module, The output terminal of the comparator U2 is connected to the input voltage VIN terminal through the switch control module; a power tube module is also connected between the bandgap reference voltage generation module and the input voltage VIN terminal, and the power tube module is also connected to other application circuit modules ; The switch control module is also connected with the power tube module. The circuit design of the invention is simple, and can solve the problems of poor stability and high cost of the current LDO circuit structure.

Description

technical field [0001] The invention relates to the technical field of low-dropout voltage stabilizing circuits, in particular to an LDO circuit applicable to a wide range of input voltages. Background technique [0002] In the design of integrated circuits for some special applications, there will be a relatively large range of input voltage requirements. For example, the input voltage of the switch IC for overvoltage protection is 2.5-35V, but the devices used inside the IC are low-voltage (5V) devices. At this time, an LDO circuit (low-dropout linear voltage regulator circuit) is needed to generate a voltage source for internal circuits. Currently, the common architectures of LDO circuits are as follows: [0003] 1) LDO structure similar to Zener diode (zener diode) function, its circuit structure is as follows figure 1 As shown, the advantage of this circuit architecture is that it does not need to use high-voltage devices, which can reduce the number of layers (number ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an LDO circuit suitable for a wide range of input voltages, so as to solve the problems of poor stability and high cost of the current LDO circuit structure.

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