A Dual Output Low Dropout Linear Regulator

Abstract

The utility model relates to a dual-output low-dropout linear regulator, which belongs to the technical field of analog integrated circuits. The positive input terminal of the first differential amplifier is connected to the first reference voltage, and its output terminal is connected to the input terminal of the first power stage; the output terminal of the first power stage is used as the second output terminal of the low dropout linear regulator and passed through the second The resistor and the fourth resistor divide the voltage and feed back to the positive input terminal of the second differential amplifier; the negative input terminal of the second differential amplifier is connected to the second reference voltage, and its output terminal is connected to the input terminal of the second power stage; the second power stage The output terminal of the low dropout linear voltage regulator is used as the first output terminal of the low dropout linear voltage regulator and fed back to the negative input terminal of the first differential amplifier through the first resistor and the third resistor. The two output voltages of the present invention can be matched and kept stable in static state and transient state; the two output voltages can be matched more accurately through the adjustment of two independent reference voltages.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, in particular to a low-dropout linear regulator circuit. Background technique [0002] Low-dropout linear regulators are commonly used solutions for on-chip power supplies. With the advancement of integrated circuit technology and the increase in the scale of SOC circuits on chips, the load current that the regulator needs to drive is getting larger and larger. Because in dual-channel and multi-channel circuit design, multiple loads are often required to obtain matching voltages, and the parasitic resistance of the distributed power supply network will cause the voltage values ​​obtained by the remote load and the near-end load to be different. [0003] Traditional single output LDO such as figure 1 and figure 2 As shown, the power stage uses a single NMOS tube or a single PMOS tube LDO, which obviously cannot meet the load's requirements for matching voltage. It is also di...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the traditional LDO is difficult to achieve load matching, the present invention proposes a dual-output low-dropout linear regulator. By establishing a single negative feedback loop, under the action of the cross-matching output module 603, two matching The output voltage can be adjusted independently, and the matching accuracy of the two output voltages can be improved by independently adjusting the two reference voltages, and the matching power supply voltage can still be obtained at the load end when the power supply lines do not match.

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