Capless LDO Regulator Feedback Control for Fast Voltage Recovery
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Solution Overview
Problem
Capacitor-less low-dropout (capless LDO) regulators in memory control chips face issues with rapid voltage drops, leading to digital data loss or circuit damage due to insufficient capacitance, as they struggle to quickly restore output voltage stability.
Innovation Solution
A regulator circuit module with a driving circuit, feedback circuit, and first regulator circuit that adjusts output voltage in response to current changes detected by the feedback voltage, enhancing the efficiency of returning the output voltage to stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a capless LDO regulator is used in the memory control chip, then the packaging structure size is reduced, but the output voltage stability deteriorates when encountering instantaneous voltage drop
Solution Approach 1:
The regulator circuit is divided into multiple functional modules: a driving circuit for voltage generation, a feedback circuit for voltage detection, and a regulator circuit for control. This segmentation allows each module to be optimized independently, enabling the compact capless design while maintaining stability through coordinated operation of the separated functional blocks.
Solution Approach 2:
The patent implements a feedback mechanism where the feedback circuit continuously monitors the output voltage and feeds this information back to the regulator circuit. The regulator circuit compares the feedback voltage with a reference voltage and adjusts the driving circuit accordingly to maintain stable output voltage, resolving the stability issue in the compact design.
2Quantity of substance
If the capacitance of the memory control chip is not large enough, then the chip size is reduced, but the ability to quickly restore output voltage stability deteriorates
Solution Approach 1:
The regulator circuit proactively monitors the output voltage through the feedback circuit and makes adjustments before significant voltage deviations occur. By continuously comparing feedback voltage with reference voltage and preemptively adjusting the driving circuit, the system restores stability quickly without relying on large capacitance to buffer voltage drops.
Solution Approach 2:
The patent changes the control parameter from direct voltage adjustment to current control. The regulator circuit controls the current of the driving circuit based on the feedback voltage, which enables faster response and voltage restoration speed without requiring large capacitance, thus achieving quick recovery with minimal capacitance.
3Device complexity
If traditional voltage-based feedback control is used, then the control mechanism is simple, but the efficiency of returning output voltage to stable state is insufficient
Solution Approach 1:
The patent changes the control parameter from voltage to current. The regulator circuit controls the current of the driving circuit based on the feedback voltage, which provides more precise and faster control compared to traditional voltage-based feedback. This parameter change enables quicker response to voltage deviations and improves restoration efficiency while maintaining reasonable control mechanism complexity.
Data Source
AI summary
A regulator circuit module, a memory storage device, and a voltage control method are disclosed. The voltage control method includes: generating an output voltage according to an input voltage by a driving circuit; generating a feedback voltage according to the output voltage; and controlling the driving circuit by a first regulator circuit to adjust the output voltage in response to a current change caused by the feedback voltage.