Overview
The LM2576T-3.3G is a step-down (buck) switching regulator from Texas Instruments, although it is often distributed and supported by various manufacturers, including Onsemi. This regulator is part of the LM2576 series, known for its simplicity, high efficiency, and wide input voltage range. It is designed to provide all the active functions for a step-down switching regulator, making it an excellent replacement for traditional three-terminal linear regulators.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Maximum Supply Voltage | 40 | V |
| Output Voltage | 3.3 | V |
| Output Current | Up to 3 | A |
| Switching Frequency | 52 kHz | kHz |
| Efficiency | Up to 77% | % |
| Operating Junction Temperature | -40 to 125 | °C |
| Package Type | TO-220, DDPAK/TO-263 | |
| Maximum Junction Temperature | 150 | °C |
| Storage Temperature | -65 to 150 | °C |
Key Features
- High Efficiency: The LM2576T-3.3G offers high efficiency, reducing the need for large heat sinks and making it suitable for applications where space is limited.
- Wide Input Voltage Range: It can operate with input voltages from 4.75 V to 40 V, making it versatile for various power supply configurations.
- Fixed Output Voltage: Available in fixed output voltages of 3.3 V, with an adjustable version also available in the series.
- Low External Component Count: Requires only four external components, simplifying the design and reducing the overall cost.
- TTL-Shutdown Capability: Features a TTL-compatible shutdown input and a low-power standby mode.
- Thermal Shutdown and Current Limiting: Includes cycle-by-cycle current limiting and thermal shutdown for full protection under fault conditions.
- Standard Inductors: Uses readily available standard inductors, simplifying the design process.
Applications
- Motor Drives: Suitable for motor drive applications due to its high current handling and efficiency.
- Server and Network Power Supplies: Often used in power supplies for servers and network equipment.
- Appliances: Used in various household and industrial appliances.
- Test and Measurement Equipment: Ideal for test and measurement equipment due to its stable output voltage and high efficiency.
Q & A
- Q: What is the maximum output current of the LM2576T-3.3G?
A: The maximum output current is up to 3 A.
- Q: What are the available output voltages for the LM2576 series?
A: The LM2576 series is available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version.
- Q: What is the typical switching frequency of the LM2576T-3.3G?
A: The typical switching frequency is 52 kHz.
- Q: Does the LM2576T-3.3G have thermal protection?
A: Yes, it includes thermal shutdown for full protection under fault conditions.
- Q: How many external components are required for the LM2576T-3.3G?
A: It requires only four external components.
- Q: What is the maximum junction temperature for the LM2576T-3.3G?
A: The maximum junction temperature is 150°C.
- Q: Is the LM2576T-3.3G suitable for high-efficiency applications?
A: Yes, it offers high efficiency, making it suitable for applications where power loss needs to be minimized.
- Q: Can the LM2576T-3.3G be used in motor drive applications?
A: Yes, it is suitable for motor drive applications due to its high current handling and efficiency.
- Q: What package types are available for the LM2576T-3.3G?
A: It is available in TO-220 and DDPAK/TO-263 packages.
- Q: Does the LM2576T-3.3G have TTL-compatible shutdown capability?
A: Yes, it features a TTL-compatible shutdown input and a low-power standby mode.
