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Comprehensive Guide To Microchip MIC28303-1YMP-TR Voltage Regulator

Release Time: Jan 21, 2025

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.

 

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.

 

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