Integrated Circuit Voltage Regulator Selection Circuit
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Solution Overview
Problem
Integrated circuits face challenges in efficiently selecting and managing internal and external voltage regulators to support various power modes with minimal pin count and hardware overhead, particularly during power-up sequences and transitions, which complicates voltage regulation and increases system complexity and cost.
Innovation Solution
The implementation of a regulator selection circuit that decodes external and internal power reset signals, along with test signals, to selectively enable or disable voltage regulators, allowing the integrated circuit to operate in different modes using either internal or external power sources, minimizing the need for additional pins and external logic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both internal and external voltage regulators are supported with selection capability, then power mode flexibility and adaptability are improved, but device complexity and hardware overhead increase
Solution Approach 1:
The regulator selection circuit is designed to universally support both internal and external voltage regulators through a unified selection mechanism. The circuit can operate in multiple modes (internal regulator mode, external regulator mode, and dual regulator mode) by receiving different control signals, eliminating the need for separate control circuits for each regulator type and reducing overall device complexity while maintaining power mode flexibility
Solution Approach 2:
The regulator selection circuit dynamically switches between internal and external voltage regulators based on real-time control signals. The circuit includes dynamic control logic that can respond to power good signals, reset signals, and mode selection inputs to automatically or manually switch regulator sources, enabling adaptive power management without requiring complex static design for each possible configuration
2Adaptability or versatility
If regulator selection and power mode control are implemented, then power management capability is improved, but pin count and hardware overhead increase
Solution Approach 1:
The regulator selection circuit uses multi-functional control signals that serve multiple purposes. For example, the power good signal from the external regulator is used both to indicate regulator readiness and as a selection criterion for enabling the external regulator. The reset signal serves both system reset and regulator selection functions. This multi-functionality reduces the need for dedicated control pins for each regulator mode
Solution Approach 2:
The external voltage regulator provides a power good signal that automatically indicates its operational status, which the selection circuit uses to make autonomous decisions about regulator selection. The system can automatically switch between internal and external regulators based on the power good signal without requiring additional control pins or complex external logic, reducing hardware overhead while maintaining full power management capability
3Ease of operation
If voltage regulator selection circuit is added, then regulator management flexibility is improved, but hardware overhead and cost increase
Solution Approach 1:
The regulator selection circuit merges the functions of internal regulator control, external regulator control, and mode selection into a single integrated control unit. The circuit combines multiple control signals (power good, reset, mode selection) and uses logic gates and multiplexers to unifiedly manage both regulators, reducing the need for separate control circuits and minimizing hardware overhead while maintaining full regulator management flexibility
Solution Approach 2:
The regulator selection circuit acts as an intermediary between the control signals and the voltage regulators. It receives control inputs, processes them through logic circuits, and generates appropriate enable/disable signals for the internal and external regulators. This intermediary approach simplifies the control interface and reduces the complexity of direct regulator control while maintaining full management flexibility
Data Source
AI summary
An integrated circuit that supports both internal and external voltage regulators as well as various modes, such as a low power mode or a test mode, includes voltage regulator selection circuitry and power control circuitry. The regulator selection circuitry selects one of internal and external regulators based on two pin conditions. The power control circuitry controls ON/OFF status of the regulators corresponding to a power mode, including power-on reset, entering a low power mode, and wake-up from a low power mode.