LDO Bandgap Reference Circuit With Power-Down Leakage Control
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Solution Overview
Problem
Low-dropout regulators (LDOs) face challenges in maintaining precise voltage regulation at higher operating voltages, leading to issues such as voltage drop, leakage current, and potential damage to circuit components.
Innovation Solution
The implementation of a power-down control circuit that maintains low gate-source and drain-source voltage differentials for IO and output driving devices, using transistors and resistors to control voltage drop and reduce leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If LDO operates at higher supply voltages, then output voltage regulation capability is improved, but voltage breakdown and leakage current increase
Solution Approach 1:
The patent introduces a power-down control circuit as an intermediary between the supply voltage and the LDO core circuitry. This control circuit monitors voltage differentials and selectively activates or deactivates internal transistors to prevent voltage breakdown, enabling the LDO to safely operate across a wider voltage range without direct exposure to harmful voltage stress.
Solution Approach 2:
The patent dynamically changes the operational parameters of internal transistors based on supply voltage conditions. By adjusting gate-source and drain-source voltage differentials through the power-down control circuit, the transistor operating points are optimized to minimize leakage current while maintaining regulation capability at higher voltages.
2Power
If LDO operates at higher supply voltages, then output voltage regulation capability is improved, but leakage current increases
Solution Approach 1:
The patent dynamically changes the operational parameters of internal transistors based on supply voltage conditions. By adjusting gate-source and drain-source voltage differentials through the power-down control circuit, the transistor operating points are optimized to minimize leakage current while maintaining regulation capability at higher voltages.
Solution Approach 2:
The power-down control circuit implements feedback mechanisms to continuously monitor voltage differentials across internal transistors. When leakage current thresholds are approached, the feedback signal triggers transistor deactivation or parameter adjustment, creating a self-regulating system that minimizes energy loss while maintaining output regulation.
3Reliability
If power-down control circuit is added, then reliability is improved, but device complexity increases
Solution Approach 1:
The power-down control circuit is designed to perform multiple functions simultaneously: it monitors voltage differentials, controls transistor activation, prevents voltage breakdown, and minimizes leakage current. By consolidating these functions into a single integrated control block, the patent reduces overall circuit complexity while maintaining high reliability.
Solution Approach 2:
The patent merges the power-down control functionality with the existing LDO structure by integrating control transistors and sensing circuits into the regular power path. This consolidation eliminates the need for separate protection circuits, reducing component count and simplifying the overall device architecture while enhancing reliability.
Data Source
AI summary
Systems and methods as described herein may take a variety of forms. In one example, systems and methods are provided for a circuit for powering a voltage regulator. A voltage regulator circuit has an output electrically coupled to a gate of an output driver transistor, the output driver transistor having a first terminal electrically coupled to a voltage source and a second terminal electrically coupled to a first terminal of a voltage divider, the voltage divider having an second terminal electrically coupled to ground, and the voltage divider having an output of a stepped down voltage. A power control circuitry transistor has a first terminal electrically coupled to the voltage source, the power control circuitry transistor having a second terminal electrically coupled to the gate terminal of the output driver transistor, and the power control circuitry transistor having a gate terminal electrically coupled to a status voltage signal.