LDO Regulator Dynamic Voltage Tracking for Card Power
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Solution Overview
Problem
Conventional card interfaces lack the ability to dynamically adjust the output voltage in response to changes in the input supply voltage, leading to inefficient component sizing and reliability issues due to constant voltage delivery to SIMC, SDC, and eMMC modules.
Innovation Solution
An embedded low dropout (LDO) regulator that tracks the input supply voltage, using a reference voltage supply circuit and error amplifier to maintain an output voltage approximately half of the input supply voltage, and a toggle detector to adjust the resistance value of a variable resistor for efficient current management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional card interfaces deliver constant voltage to SIMC, SDC, and eMMC modules, then voltage stability is maintained, but the interfaces lack the ability to dynamically adjust to input supply voltage changes, leading to inefficient component sizing and reliability issues
Solution Approach 1:
The patent implements a low dropout regulator that dynamically adjusts the output voltage in response to changes in the input supply voltage. The regulator continuously monitors the input voltage and modulates the pass transistor to maintain the appropriate output voltage level, transforming the static constant voltage delivery into a dynamic adaptive system that responds to real-time conditions.
Solution Approach 2:
The patent employs a feedback mechanism where the output voltage is monitored and compared against the input supply voltage conditions. The low dropout regulator uses this feedback information to adjust its operation, ensuring that the output voltage remains within acceptable ranges even when input voltage fluctuates, thereby improving both adaptability and reliability.
2Reliability
If the LDO regulator is designed to handle maximum voltage differences, then reliability is improved, but component sizing becomes inefficient and power consumption increases
Solution Approach 1:
The low dropout regulator dynamically adapts its operation to the actual voltage difference between input and output. Rather than being designed for worst-case maximum voltage differences, the regulator adjusts its internal resistance and current flow based on real-time voltage conditions, optimizing power consumption while maintaining reliability across varying operating conditions.
Solution Approach 2:
The patent changes the operating parameters of the LDO regulator based on the actual voltage conditions. The regulator adjusts its dropout voltage, current limiting thresholds, and protection activation levels dynamically, allowing it to operate efficiently at low voltage differences while still providing adequate protection against voltage variations.
3Reliability
If the LDO regulator provides adequate headroom for all operating conditions, then reliability is improved, but the dropout voltage increases, reducing efficiency in battery-operated devices
Solution Approach 1:
The low dropout regulator dynamically adjusts its internal voltage drops and headroom requirements based on the actual operating conditions. By monitoring the input-output voltage difference and adapting its operation accordingly, the regulator maintains adequate headroom for reliability when needed while minimizing dropout voltage during normal operation, thereby improving overall efficiency in battery-operated devices.
Data Source
AI summary
A low dropout regulator and system for supplying power to a card are provided. A low dropout regulator includes a reference voltage supply circuit configured to output a reference voltage based on an input supply voltage. An error amplifier has a first input, a second input, and a single-ended output. The first input is coupled to the reference voltage, and the second input is coupled to an output node of the low dropout regulator via a first feedback resistor. A pass transistor includes a control electrode connected to the single-ended output of the error amplifier, a first electrode connected to a ground node, and a second electrode connected to the output node of the low dropout regulator. A first power supply terminal of the error amplifier is connected to the output node, and the output node provides an output voltage of the low dropout regulator that powers the error amplifier.