Dual-loop low dropout regulator

A technology of low-dropout linear and linear voltage regulators, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as ESR fluctuations, increased chip area, large output current, etc., to reduce chip area and power Consumption, to ensure the effect of system stability
CN102830741BInactive Publication Date: 2014-03-05UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2014-03-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a dual-loop low dropout regulator, which comprises a first loop and a second loop, wherein the first loop is a three-level amplifier formed by a first amplifier stage, a second amplifier stage, a third amplifier stage, a first compensation network and a second compensation network, and a second loop is a three-level amplifier formed by a second amplifier stage, a fourth amplifier stage, a fifth amplifier stage and a third compensation network. According to the invention, a constant-voltage output of the LDO (Low Dropout Regulator) is controlled by the first loop, an output current of LDO is limited by the second loop so as to prevent the output current from exceeding an over-current point when an over-current condition appears, and the second compensation network and the output port of the LDO are externally connected with a load capacitor, so that a pseudo ESR (Equivalent Series Resistance) zero setting compensation network is integrated in the first loop, and the frequency compensation of the first loop is realized; and meanwhile, the second amplifier stage of the second loop and the second amplifier stage of the first loop are shared, so that the conventional dual-loop LDO circuit is simplified, and the area and the consumption of a chip are reduced.
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Description

technical field

[0001] The invention belongs to the technical field of power supply management, and in particular relates to the design of a low dropout linear regulator (LDO, Low Dropout Regulator). Background technique

[0002] With the development of integrated circuits towards SoC (System on Chip), the power management unit is gradually integrated into the chip and plays an important role. As an important type in power management modules, LDOs are widely used because they can provide low-noise, high-precision stable power supply voltages for noise-sensitive analog modules.

[0003] In terms of LDO reliability, due to factors such as power-on establishment, limited power supply capacity, and LDO overload, the LDO is often in an unstable working state. Based on the above reasons, many problems will occur: (1) During the establishment of the LDO, the loop load The feedback mechanism prompts the power tube to output a large current, which may cause the LDO power supply modu...

Claims

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