Low-dropout voltage stabilizing circuit supporting multiple direct parallel outputs, operation method and power supply device thereof

Abstract

A low-dropout voltage regulator circuit that supports multiple direct parallel outputs, including: N error amplifiers, N output stage circuits, and N voltage dividers, the error amplifier is used to compare the reference voltage and the feedback voltage of the output voltage and based on the comparison As a result, an error signal is output; the output stage circuit includes a plurality of metal-oxide-semiconductor transistors and has a gate connected to the error signal, a source connected to the input voltage, and a drain connected to the output voltage; the voltage divider outputs a predetermined portion of the voltage Feedback to the error amplifier as a feedback signal; where N≧2, the output stage circuit includes a first MOS transistor and a second MOS transistor, the first MOS transistor has a source connected to the input voltage, a drain connected to the error amplifier and a gate and a drain the second MOS transistor has a source connected to the input voltage, a drain connected to the output voltage and a gate connected to the gate of the first MOS transistor.

Description

technical field [0001] The present invention relates to a technical field of power supply, in particular to a low-dropout voltage regulator circuit with multiple direct parallel outputs, an operation method, and a device with various types of power supply loads, such as consumer electronics, communication fields, and automotive electronics. The power supply device of the low dropout voltage stabilizing circuit. Background technique [0002] Consumer electronic products have become an indispensable part of people's daily life, and power management chips play an important role in electronic equipment, and their performance has a direct impact on the energy consumption of the entire circuit. There are many types of power management chips, among which linear regulators, switching regulators (DC / DC), driver chips and power management units account for more than half of the total. Among these major categories, linear regulators occupy the largest market share. Due to its high co...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that the forward conduction voltage VF of the diode will change with the change of the load current and the ambient temperature, resulting in low output voltage accuracy and poor load regulation after the LDO regulator is connected in parallel.

The disadvantage of this technology is that the current sharing effect is related to the resistance value of the ballast resistor. The larger the resistance value, the better the current sharing effect, but at the same time, the larger the IR drop of the output voltage, the greater the loss of system power consumption.

Moreover, it is not easy to achieve a complete match between the ballast resistors R1 and R2 connected in parallel, such as figure 2 shown

[0005] It can be seen from the above that no matter for the parallel connection of multi-channel discrete structure LDO chips or the parallel connection of different LDO modules inside the multi-channel power management chip (PMU chip), to achieve the current sharing effect of the output current requires external diodes or ballast resistors. Auxiliary, and the current sharing effect is limited

At the same time, using the above two technologies, the loop stability of the parallel connection of LDO regulators will be affected, and additional frequency compensation needs to be considered

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