PMIC Power-Up Modes for Main and Backup Supply Switching
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Solution Overview
Problem
Existing power management systems for memory systems face challenges in efficiently handling multiple initialization and power-up sequences, particularly when dealing with dual-input or single-input voltage supplies.
Innovation Solution
The development of a power management integrated circuit device (PMIC) that supports multiple power-up initialization sequences by monitoring the status of both main and backup supply voltages and configuring the power-up mode through EFUSE or MTP registers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the PMIC supports multiple power-up initialization sequences for dual-input or single-input voltage supplies, then the adaptability and versatility of the PMIC is improved, but the device complexity increases due to multiple monitoring and configuration mechanisms
Solution Approach 1:
The PMIC is designed to perform multiple functions by supporting both dual-input and single-input voltage supply configurations through a unified device architecture. The same PMIC can adapt to different power supply scenarios (dual-supply with main and backup voltages, or single-supply with only backup voltage) without requiring separate dedicated circuits, thereby achieving multi-functionality and resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The PMIC employs dynamic configuration capabilities where the power-up sequence and operational mode are determined based on detected conditions (presence or absence of main supply voltage) and configurable parameters (EFUSE or MTP register settings). This dynamic adaptability allows the device to automatically adjust its behavior to match the actual power supply configuration, achieving versatility without requiring multiple fixed complex circuits.
2Reliability
If the PMIC monitors the status of both main and backup supply voltages to execute appropriate power-up sequences, then the reliability of power management is improved, but the device complexity increases due to additional monitoring circuits
Solution Approach 1:
The PMIC incorporates self-service monitoring capabilities where the device automatically detects and monitors the status of main and backup supply voltages using integrated voltage detection circuits. This self-monitoring mechanism enables the PMIC to autonomously determine the appropriate power-up sequence based on the detected voltage conditions without requiring external complex monitoring systems, thereby improving reliability while minimizing additional complexity.
Solution Approach 2:
The PMIC uses feedback mechanisms from voltage monitoring circuits to continuously assess the status of main and backup supply voltages. This feedback information is processed by the control logic to dynamically select and execute the appropriate power-up initialization sequence, ensuring reliable operation under varying power supply conditions while using efficient integrated monitoring rather than separate complex external circuits.
3Adaptability or versatility
If the PMIC uses EFUSE or MTP registers to configure power-up mode, then the adaptability to different power supply configurations is improved, but the device complexity increases due to configuration memory structures
Solution Approach 1:
The PMIC employs EFUSE (eFuse) or MTP (Multi-Time Programmable) register structures that are pre-configured or programmably configured before normal operation to store the desired power-up mode settings. This preliminary configuration allows the device to be adapted to specific power supply configurations (dual-input or single-input) in advance, enabling versatile operation without requiring complex runtime decision-making or additional configuration hardware during power-up sequences.
Data Source
AI summary
Disclosed are techniques for a power management integrated circuit (PMIC) to support a power-up sequence from a powered-down state to a powered-up state when both a main supply voltage and a backup supply voltage are present or when only the backup supply voltage is present. The PMIC may monitor the two supply voltages to identify the supply voltages that are present. The PMIC may be configured with a power-up initialization mode of operation through an EFUSE/MTP register, including a first bit to control power up of a voltage regulator of the PMIC with the main supply voltage or the backup supply voltage. Another bit may control power up of the voltage regulator with the backup supply voltage in the dual-supply or the single-supply configuration. The PMIC may execute one of four power-up sequences based on the monitored status of the supply voltages and the configured power-up initialization mode of operation.