LM2576HVT-5 Overview

The LM2576HVT-5 is a high-voltage step-down (buck) switching regulator manufactured by Texas Instruments (TI). 

Part of the LM2576 series, the "HVT" variant is designed to handle higher input voltages (up to 60V), 

making it suitable for rugged industrial and automotive applications. It provides a fixed 5V output voltage with up to 3A continuous output current, 

combining high efficiency, simplicity, and robust protection features.

Key Functions & Features

1. High-Voltage Input Capability

• Input Voltage Range: Accepts input voltages from 6V to 60V, making it ideal for systems with wide input variations (e.g., automotive, industrial power supplies).
• Fixed 5V Output: Delivers a regulated 5V output with ±4% tolerance over input voltage, load, and temperature ranges.

2. High Efficiency Switching Operation

• Switching Frequency: Operates at 52kHz, allowing the use of larger inductors (for lower cost) but limiting high-frequency noise.
• Efficiency: Achieves up to 82% efficiency, reducing power dissipation and heat generation compared to linear regulators, especially at high input voltages.

3. Robust Protection Mechanisms

• Thermal Shutdown: Automatically disables the output if the junction temperature exceeds ~150°C, preventing damage from overheating.
• Current Limiting: Limits peak output current to ~3.5A–4.5A, protecting the regulator and downstream components from short circuits or overloads.
• Input Undervoltage Lockout (UVLO): Prevents malfunction by disabling the regulator when the input voltage drops below a threshold (~4.65V).

4. Simple Circuit Design

• Minimal External Components: Requires only an inductor, input/output capacitors, and a diode (e.g., Schottky diode for higher efficiency), reducing BOM cost and design complexity.
• Internal Oscillator: Eliminates the need for external timing components.

5. Wide Temperature Range

• Operation Temperature: -40°C to +125°C (full military temperature range for certain variants), suitable for harsh environments.

Applications

1. Industrial Systems

• Industrial Power Supplies: Converts high-voltage inputs (e.g., 24V, 48V industrial rails) to 5V for microcontrollers, sensors, and actuators.
• Factory Automation: Powers PLCs, motor drives, and control panels in noisy industrial environments, with protection against voltage spikes and overloads.
• Renewable Energy Systems: Regulates power in solar/wind energy setups with unstable input voltages.

2. Automotive and Transportation

• Vehicle Electronics: Converts the car's 12V/24V battery supply (withstanding cranking surges up to 40V) to 5V for infotainment systems, GPS modules, and ECUs (engine control units).
• Heavy-Duty Vehicles: Used in trucks, buses, and construction equipment to power diagnostic tools, cameras, and communication systems.
• EV/HEV Subsystems: Provides stable 5V power for low-voltage auxiliary circuits in electric vehicles.

3. Telecom and Networking

• Telecom Equipment: Converts 48V DC telecom rails to 5V for network switches, routers, and base station components.
• Surge-Prone Environments: Suitable for outdoor telecom cabinets or remote sites with unstable power supplies, thanks to its high-voltage tolerance.

4. Aerospace and Defense

• Avionics Systems: Powers onboard electronics in aircraft or drones, operating reliably under wide temperature and voltage ranges.
• Military Equipment: Used in ruggedized systems (e.g., radar, communication devices) requiring high-voltage input protection and extended temperature operation.

5. Consumer Electronics (High-Voltage Use Cases)

• High-Power Devices: Converts voltage from AC adapters (e.g., 19V laptop power supplies) to 5V for USB charging hubs or high-current USB-C devices (with proper current limiting).
• DIY Projects: Popular in hobbyist robotics or Arduino projects requiring robust high-voltage regulation.

6. Battery-Powered Systems

• Multi-Cell Batteries: Regulates voltage from 4–14-cell lead-acid or Li-ion battery packs (e.g., 12V–60V) to 5V for portable tools, medical devices, or IoT sensors.

The following parts are popular search parts in PMIC - Voltage Regulators - DC DC Switching Regulators.

The following parts include "LM2576HVT-5.0" in ISSI, Integrated Silicon Solution Inc“LM2576HVT-5.0”.

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