LM2576HVT-ADJ Overview

The LM2576HVT-ADJ is a high-voltage adjustable step-down (buck) switching regulator from Texas Instruments (TI), 

part of the LM2576 series. The "HVT" designation indicates its ability to handle higher input voltages (up to 60V), 

while the "ADJ" (adjustable) variant allows users to set the output voltage via an external resistor divider. 

This flexibility makes it suitable for diverse applications requiring customizable DC power, from industrial systems to automotive electronics. 

It delivers up to 3A continuous output current with high efficiency and robust protection features.

Key Functions & Features

1. High-Voltage Input & Adjustable Output

• Input Voltage Range: Supports inputs from 6V to 60V, ideal for systems with wide voltage fluctuations (e.g., automotive batteries, industrial power rails).
• Adjustable Output Voltage: Output voltage can be set between 1.23V and ~57V using two external resistors (
• R1, R2) via the formula:\(V_{OUT} = 1.23V \times \left(1 + \frac{R2}{R1}\right)\) Typical applications use
•  R1 = 1kΩ and R2 from ~1.5kΩ to ~47kΩ for common voltages (e.g., 3.3V, 5V, 12V).

2. Efficient Switching Operation

• Switching Frequency: Fixed at 52kHz, enabling the use of low-cost inductors (though higher frequency reduces output ripple in some designs).
• Efficiency: Achieves up to 82% efficiency, minimizing heat generation compared to linear regulators, especially at high input voltages.

3. Comprehensive Protection Features

• Thermal Shutdown: Disables the output if the junction temperature exceeds ~150°C, preventing damage from overheating.
• Current Limiting: Restricts peak output current to ~3.5A–4.5A, protecting against short circuits or overloads.
• Input Undervoltage Lockout (UVLO): Shuts down the regulator when the input voltage drops below ~4.65V to avoid unstable operation.

4. Simplified Design with Minimal Components

• External Components Required: Inductor, input/output capacitors, Schottky diode, and two resistors (for voltage setting).
• Internal Features: Integrates a high-current switch, oscillator, and feedback control circuit, reducing design complexity.

5. Wide Temperature Range

• Operation Temperature: -40°C to +125°C (full military grade for specific variants), ensuring reliability in harsh environments.

Applications

1. Industrial and Automation Systems

• Custom Power Supplies: Converts high-voltage inputs (e.g., 24V, 48V, or 60V industrial rails) to adjustable voltages for PLCs, HMIs, and motor control systems.
• Factory Equipment: Powers sensors, actuators, and variable-speed drives with precise voltage regulation, even in noisy or high-temperature environments.
• Renewable Energy: Regulates voltage in solar/wind setups with unstable inputs, such as converting 48V solar arrays to lower voltages for battery charging or load operation.

2. Automotive and Transportation

• Vehicle Electronics: Converts 12V/24V vehicle batteries (withstand cranking surges up to 40V) to adjustable voltages for ECUs, dashcams, or infotainment systems.
• Heavy-Duty Vehicles: Used in trucks, buses, and construction equipment to power diagnostic tools, cameras, and communication modules with variable voltage needs.
• EV/HEV Subsystems: Provides adjustable low-voltage power (e.g., 12V, 5V) for auxiliary circuits in electric vehicles, such as battery management systems (BMS).

3. Telecom and Networking

• Telecom Infrastructure: Converts 48V DC telecom rails to adjustable voltages for network switches, routers, and base station components (e.g., 3.3V for ICs, 12V for fans).
• Outdoor Equipment: Suitable for outdoor telecom cabinets or remote sites with unstable power, thanks to its high-voltage tolerance and surge protection.

4. Aerospace and Defense

• Avionics and Robotics: Powers adjustable voltage systems in aircraft, drones, or military robots, ensuring stable operation across wide temperature and voltage ranges.
• Ruggedized Systems: Used in radar, communication devices, or missile systems requiring high-voltage input protection and customizable power outputs.

5. Consumer Electronics and DIY Projects

• High-Power Chargers: Converts 19V laptop adapters to adjustable voltages for USB-C hubs, fast chargers, or high-current devices (e.g., 5V–20V for PD applications).
• Hobbyist Electronics: Popular in DIY robotics, Arduino projects, or RC vehicles, where adjustable voltage (e.g., 3.3V for sensors, 12V for motors) is needed.

6. Battery-Powered Devices

• Multi-Cell Battery Systems: Regulates voltage from 4–14-cell lead-acid or Li-ion batteries (12V–60V) to adjustable outputs for portable tools, medical devices, or IoT sensors.
• Battery Charging: Configured as a charger for various battery chemistries by setting the output voltage to the required float or charge voltage (e.g., 12.6V for Li-ion).

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