Multi-Branch MOSFET Voltage Regulator for Faster LDO Response
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Solution Overview
Problem
Existing voltage regulators, particularly low drop-out (LDO) regulators, face challenges in efficiently regulating voltage due to limitations in their design, which can result in slower response times to changes in load current.
Innovation Solution
The proposed solution involves a voltage regulator design that includes multiple branches of transistors coupled in series, with specific coupling configurations between the control nodes of the transistors to enhance voltage regulation. This design incorporates P-channel and N-channel MOSFET transistors, along with resistors and current sources, to create a more dynamic and responsive regulation system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional LDO regulator design is used, then the output voltage is very close to the power supply voltage, but the response time to load current changes is slow
Solution Approach 1:
The regulator is divided into multiple parallel branches (first branch with first, second, third transistors; second branch with fourth, fifth, sixth transistors), each capable of independently contributing to the output current. This segmentation allows faster response to load changes by enabling parallel current adjustment paths while maintaining stable voltage regulation through the coordinated operation of branch control circuits
Solution Approach 2:
The regulator employs dynamic control through multiple transistor branches with independent control nodes that can rapidly adjust their conduction states in response to load changes. The control circuit dynamically balances the current distribution between branches based on instantaneous conditions, achieving both fast transient response and stable steady-state regulation
Data Source
AI summary
The present description concerns a device comprising a voltage regulator comprising first and second branches comprising first, second, and third transistors, the control nodes of the first transistors of the first and second branches being coupled together, the control node of the third transistor of each first and second branch being coupled to the junction point of the first and second transistors of the same branch, a fourth transistor, and a fifth transistor, the control nodes of the fourth transistor and of the second transistor of the first branch being coupled together to a node of application of a set point voltage, the control nodes of the fifth transistor and of the second transistor of the second branch being coupled together to an output node of the regulator.