Fully integrated multi-output stackable low-dropout regulator (LDO)

Abstract

The invention discloses a fully integrated multi-output stackable low-dropout regulator (LDO). The fully integrated multi-output stackable low-dropout regulator (LDO) comprises a main LDO and an auxiliary LDO<k>; k is 1,2...n; the main LDO is connected with an on-chip capacitor C<k> and a load Load<k> on an auxiliary LDO<k> circuit through an on-chip capacitor C<0> and a load Load<0> in series, sothat a stacked structure is formed; the main LDO is used for providing current required by the load; the auxiliary LDO<k> is used for stabilizing VOUT<k> voltage; and, when the load current is not same, a I<source> current flowing from VDD<k> to VOUT<k> through MP<k> or a I<sink> current flowing from VOUT<k> to GND through MN<k> is generated. According to the stacked structure in the invention, the output voltage value and the output voltage number can be flexibly adjusted according to load requirements; relatively flexible load requirements are satisfied; due to the three working modes of the auxiliary LDO<k>, voltage current fluctuation due to mismatching between loads can be rapidly adjusted; the dynamic performance of a power supply system is improved; due to the fully integrated structure, system integration is easily carried out; the cost is easily reduced; all output ends, particularly an output end near the GND, have good PSR characteristic; and thus, the LDO is suitable for amodule sensitive to a power supply.

Description

technical field [0001] The invention belongs to the technical field of design of semiconductor integrated circuits and low-power integrated circuits, and specifically relates to a fully integrated multi-output stacked low-dropout linear voltage regulator, which is applied to the fields of high-performance power supply systems and consumer electronics products. Background technique [0002] LDOs are one of the widely used voltage converters in power management systems and are especially important in battery-powered portable devices such as cell phones, tablets, and wearables. LDOs feature low noise and fast response, making them ideal for high-performance and supply voltage-sensitive analog / mixed-signal modules. Due to the LDO's structure and working principle, when the input and output voltages differ greatly, the system efficiency is low. Especially in the current application environment, with the continuous upgrading of integrated circuit technology, the required power su...

AI Technical Summary

Problems solved by technology

[0004] 1. The on-chip capacitor increases the chip area, and the off-chip capacitor increases the system cost;

[0005] 2. Clock control leads to an increase in system complexity, and the switched capacitor structure itself has a poor power supply rejection ratio (PSR), which is not suitable for sensitive circuits

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