Overview
The L4974A is a buck switching regulator IC from STMicroelectronics, designed to provide a high-efficiency and adjustable output voltage. This integrated circuit is housed in a 20-DIP package and is capable of delivering up to 3.5A of output current. The L4974A is part of STMicroelectronics' lineup of power management solutions, offering a reliable and compact option for various power supply applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | Adjustable, 5.1V typical | V |
| Output Current | Up to 3.5A | A |
| Input Voltage Range | Typically up to 50V | V |
| Switching Frequency | Up to 500KHz | Hz |
| Package Type | 20-DIP (0.300", 7.62mm) | - |
| Efficiency | High efficiency, typically up to 92% | % |
| Thermal Shutdown | Around 150°C with hysteresis | °C |
Key Features
- High Efficiency: The L4974A offers high efficiency switching, typically up to 92%, making it suitable for applications where power loss needs to be minimized.
- Adjustable Output Voltage: The output voltage is adjustable, with a typical reference voltage of 5.1V.
- High Output Current: Capable of delivering up to 3.5A of output current.
- Internal Current Limiting: Features internal current limiting to protect against overcurrent conditions.
- Thermal Protection: Includes thermal shutdown to prevent overheating, with a typical threshold around 150°C.
- Soft Start: Incorporates a soft start function to prevent output overcurrents during startup.
- Under Voltage Lockout: Provides under voltage lockout to ensure stable operation.
Applications
The L4974A is suitable for a variety of applications, including:
- Power Supplies: For building efficient and reliable power supplies in various electronic systems.
- Industrial Control Systems: Where high current and adjustable voltage are required.
- Automotive Systems: Due to its robust design and high efficiency, it is suitable for automotive applications.
- Consumer Electronics: For powering devices that require a stable and efficient power source.
Q & A
- What is the typical output voltage of the L4974A?
The typical output voltage of the L4974A is 5.1V, but it is adjustable.
- What is the maximum output current of the L4974A?
The L4974A can deliver up to 3.5A of output current.
- What is the switching frequency range of the L4974A?
The switching frequency can go up to 500KHz.
- Does the L4974A have thermal protection?
- What package type is the L4974A available in?
The L4974A is available in a 20-DIP package.
- What are some key features of the L4974A?
Key features include high efficiency, adjustable output voltage, internal current limiting, soft start, and under voltage lockout.
- What applications is the L4974A suitable for?
The L4974A is suitable for power supplies, industrial control systems, automotive systems, and consumer electronics.
- How does the soft start function work in the L4974A?
The soft start function prevents output overcurrents during startup by allowing the error amplifier to rise linearly under the charge of an internal constant current source.
- Does the L4974A have internal current limiting?
- What is the efficiency of the L4974A?
The L4974A offers high efficiency, typically up to 92%.
