LDO Regulator Segmented Current Sources for Load Transitions
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Solution Overview
Problem
Integrated LDO regulators face challenges in achieving optimal standby current and speed while maintaining low power consumption, particularly in transitioning between light and heavy loads in integrated circuit applications.
Innovation Solution
The introduction of an additional current supply and switching control mechanism, utilizing a voltage divider feedback loop, error amplifier, and PMOS transistors as both standby and charging current sources, allows for improved control over output voltage and current delivery, enhancing performance metrics such as drop-out voltage, speed, and load regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a single current source is used in LDO regulator, then device complexity is reduced, but the regulator cannot simultaneously achieve low standby current and high speed during load transitions
Solution Approach 1:
The current source is segmented into two separate current sources: a first current source configured to operate during light load conditions and a second current source configured to operate during heavy load conditions. This segmentation allows each current source to be optimized for its specific operating condition, enabling low standby current during light loads while providing high current capability during heavy loads, thereby resolving the contradiction between speed and power consumption.
2Productivity
If additional current supply and switching control are added, then performance metrics (speed, load regulation) are improved, but device complexity increases
Solution Approach 1:
The regulator employs dynamic switching control that automatically transitions between the first and second current sources based on real-time detection of load conditions. The switching mechanism is controlled by detecting voltage changes at the output node, enabling the system to adapt its current supply characteristics dynamically. This dynamic operation improves productivity by optimizing performance for each operating condition while keeping the complexity manageable through automated control rather than manual intervention.
Data Source
AI summary
A device includes an error amplifier, a standby current source, a charging current source, a voltage divider, and a first switch. The error amplifier has a negative input terminal and a positive input terminal. The standby current source has a control terminal electrically connected to an output terminal of the error amplifier. The voltage divider has an input terminal electrically connected to an output terminal of the standby current source, and an output terminal electrically connected to the positive input terminal of the error amplifier. The charging current source has a control terminal electrically connected to the output terminal of the error amplifier. The first switch has a first terminal electrically connected to an input terminal of the charging current source, and a second terminal electrically connected to a first power supply node.