The Microchip MIC28303-1YMP-TR is a high-performance voltage regulator designed for efficient power conversion in a variety of applications. It is part of the MIC28xx series from Microchip Technology, which includes integrated regulators suitable for powering sensitive circuits in both commercial and industrial designs. Below is a comprehensive guide to the MIC28303-1YMP-TR.
1. Overview:
· Manufacturer: Microchip Technology
· Product Type: Step-Down (Buck) Voltage Regulator
· Regulation Type: Synchronous Buck Regulator
· Input Voltage Range: 4.5V to 60V
· Output Voltage: 3.3V
· Output Current: Up to 3A
· Package Type: 10-pin MLPQ (Leadless Package) for surface mounting
· Features: High efficiency, compact size, low quiescent current, integrated protections
2. Key Features:
· Wide Input Voltage Range: The MIC28303-1YMP-TR supports an input voltage range of 4.5V to 60V, making it ideal for a wide range of applications, from automotive (12V, 24V systems) to industrial and communication devices.
· Output Voltage: The device outputs a fixed 3.3V with high accuracy, suitable for powering 3.3V logic circuits and other low-voltage components.
· Output Current: Capable of delivering up to 3A of continuous output current, which is sufficient for driving medium-power devices and components.
· High Efficiency: With efficiencies up to 95%, it provides minimal heat dissipation, reducing the need for heat sinks and improving overall energy efficiency in your system.
· Low Quiescent Current: The regulator operates with a very low quiescent current (typically around 40µA), making it suitable for battery-powered applications where power consumption is critical.
· Thermal Protection: The device includes built-in thermal shutdown to protect against overheating during heavy load conditions.
· Overcurrent Protection: The MIC28303-1YMP-TR integrates current limiting and foldback protection, ensuring safe operation under short-circuit or overload conditions.
· Internal Soft-Start: Built-in soft-start function reduces inrush current during startup, which helps to minimize stress on the circuit and components.
· Output Voltage Accuracy: The device ensures precise voltage regulation, with ±2% accuracy on the output voltage, providing stable and reliable power to the load.
· Compact and Robust Design: The 10-pin MLPQ package offers a small footprint, suitable for space-constrained designs. The device is also designed for reliable operation in harsh environments, with wide temperature tolerance.
3. Electrical Characteristics:
· Input Voltage Range: 4.5V to 60V
· Output Voltage: Fixed 3.3V
· Output Current: Capable of delivering up to 3A (Continuous)
· Efficiency: Up to 95%, depending on the load and input voltage.
· Output Voltage Accuracy: ±2% (typically)
· Operating Temperature: -40°C to +125°C (Ambient)
· Quiescent Current: ~40µA (typical)
· Ripple and Noise: Typically less than 30mVp-p (depending on output current and layout)
· Switching Frequency: Fixed at 300kHz (can be synchronized in some configurations)
· Thermal Shutdown: Active thermal protection kicks in when the junction temperature exceeds 150°C.
· Overcurrent Protection: Integrated current limit and foldback protection to prevent damage under fault conditions.
4. Application Circuit:
The MIC28303-1YMP-TR is designed to be easy to integrate into power supply designs. A typical application includes the following:
· Input Capacitors: It is common to place input capacitors to filter the incoming voltage and reduce ripple. Common values are 10µF (ceramic) and 100µF (electrolytic).
· Output Capacitors: For output stability, a combination of ceramic and tantalum capacitors (e.g., 22µF and 100µF) is typically used.
· Inductor Selection: An appropriate inductor value (typically 4.7µH to 10µH) should be selected based on the input and output requirements, including the current and switching frequency.
· Feedback Resistor: The feedback network ensures precise regulation of the output voltage.
· PCB Layout: Good layout practices are crucial for minimizing noise and optimizing efficiency. A well-grounded, short trace design is recommended to minimize losses.
5. Applications:
The MIC28303-1YMP-TR is versatile and can be used in various applications where a stable 3.3V output is required from a wide input voltage range:
· Automotive Electronics: Powers 3.3V logic circuits from a 12V or 24V automotive power system.
· Industrial Equipment: Ideal for powering sensors, control systems, and communication interfaces in industrial automation.
· Telecommunications: Used in base stations, routers, and other communication equipment.
· Embedded Systems: Provides efficient power for microcontrollers, DSPs, FPGAs, and other low-voltage components.
· Battery-Powered Devices: Low quiescent current makes it suitable for energy-efficient applications in portable or battery-operated devices.
· Medical Devices: Powers medical circuits that require precise and reliable 3.3V regulation.
6. Protection Features:
The MIC28303-1YMP-TR is built with several internal protections to ensure robust operation in demanding environments:
· Thermal Shutdown: Automatically shuts the device down to prevent thermal damage when the junction temperature exceeds a safe limit (typically 150°C).
· Overcurrent Protection: The regulator includes both constant current limiting and foldback protection to avoid damage under short-circuit or overload conditions.
· Under-voltage Lockout (UVLO): Prevents the device from operating when the input voltage is too low to ensure stable regulation.
· Overvoltage Protection: Integrated internal protections limit the output voltage from exceeding the safe operating range.
7. Development and Integration:
· Evaluation Boards: Microchip offers evaluation boards to help developers quickly test the functionality and performance of the MIC28303-1YMP-TR in their own systems. The board typically includes all necessary passive components (inductors, capacitors) for stable operation.
· Application Notes: Microchip provides application notes that guide engineers on optimizing their designs, including layout suggestions for minimizing noise and improving power conversion efficiency.
· Simulation Tools: Microchip's MPLAB X IDE and Simulink integration provide simulation tools for performance evaluation and design validation before hardware prototyping.
8. Advantages:
· High Efficiency: With up to 95% efficiency, the MIC28303-1YMP-TR minimizes power loss and heat generation, leading to longer operational lifetimes and reduced cooling requirements.
· Compact Package: The MLPQ-10 package is small, making it ideal for space-constrained applications.
· Wide Input Range: Supports a wide input voltage range (4.5V to 60V), making it highly versatile for various system voltages.
· Low Power Consumption: Its low quiescent current (~40µA) makes it suitable for battery-powered applications, extending battery life.
· Reliable Protections: Built-in thermal, overcurrent, and undervoltage protections enhance reliability and ensure safe operation in demanding environments.
9. Related Devices:
If you need variations in output voltage or current, Microchip offers other devices in the MIC28xx family that may be more suitable:
· MIC28302-1YMP-TR: A similar device but with 2A output current capability.
· MIC28304-1YMP-TR: A higher-power version capable of delivering more than 3A of output current.
10. Resources:
· Datasheet: For detailed technical specifications, application circuits, and more, refer to the official datasheet from Microchip.
· Evaluation Board: Check Microchip's website for available evaluation boards for hands-on testing and development.
· Customer Support: Microchip offers extensive technical support and documentation for integrating their products.
In Summary, the MIC28303-1YMP-TR is a highly efficient, robust step-down (buck) regulator designed to provide a stable 3.3V output from a wide range of input voltages. With its high efficiency, low quiescent current, and integrated protections, it is ideal for space-constrained, battery-powered, or industrial applications requiring reliable and precise voltage regulation. The device is suitable for a broad range of industries, including automotive, telecommunications, and embedded systems.