STMicroelectronics

L4972AD

L4972AD Description

The L4972AD from STMicroelectronics is a high-performance adjustable buck (step-down) switching voltage regulator designed for demanding power supply applications. This obsolete but robust IC delivers a 2A output current with a wide input voltage range of 15V to 50V, making it suitable for industrial and automotive systems requiring stable power conversion. The output voltage is adjustable from 5.1V to 40V, providing flexibility for various load requirements. Operating at a switching frequency of 100kHz to 200kHz, it balances efficiency and component size. Packaged in a 20-pin SOIC (Surface Mount) and compliant with ROHS3 and REACH standards, the L4972AD is engineered for reliability in harsh environments.

L4972AD Features

• Adjustable Output (5.1V–40V): Precision voltage regulation for diverse applications.
• High Input Voltage (50V Max): Ideal for automotive and industrial power systems.
• 2A Output Current: Supports moderate to high-power loads.
• Buck Topology: Efficient step-down conversion with minimal heat dissipation.
• Non-Synchronous Rectification: Simplified design with external diode flexibility.
• Wide Switching Frequency (100kHz–200kHz): Optimizes efficiency and reduces external component size.
• MSL 3 (168 Hours): Suitable for extended storage before assembly.
• Robust Packaging (20SO Tube): Ensures mechanical and thermal durability.

L4972AD Applications

The L4972AD excels in systems requiring high-efficiency voltage conversion and wide input voltage tolerance:

• Automotive Electronics: Power modules, infotainment systems, and LED drivers.
• Industrial Controls: PLCs, motor drives, and instrumentation power supplies.
• Telecom Infrastructure: Base stations and networking equipment.
• Consumer Electronics: High-voltage adapters and battery chargers.
• Renewable Energy Systems: Solar inverters and wind turbine controllers.

Conclusion of L4972AD

The L4972AD is a versatile, high-performance buck regulator offering wide adjustability, high current capability, and rugged design. While obsolete, its 50V input tolerance and 2A output make it a preferred choice for legacy or niche applications demanding reliability under varying voltage conditions. Engineers value its efficiency, compact footprint, and compliance with environmental standards, ensuring long-term usability in critical power systems. For modern designs, STMicroelectronics may recommend alternative models, but the L4972AD remains a proven solution for robust DC-DC conversion.