The LM25088MH-1 is a high voltage adaptive constant on-time (COT) synchronous buck regulator controller from National Semiconductor (now Texas Instruments). This controller is designed for step-down (buck) DC-DC converter applications. Its adaptive COT architecture provides excellent transient response and simplifies design. It is suitable for applications requiring high efficiency and a wide input voltage range.

Applications:

• Automotive Power Supplies: Used in automotive systems requiring step-down voltage conversion.
• Industrial Power Supplies: Implemented in industrial equipment requiring high efficiency and robust performance.
• Telecom Power Supplies: Used in telecom infrastructure equipment requiring reliable power conversion.
• Base Stations: Powers various components within cellular base stations.
• Distributed Power Systems: Used as a point-of-load regulator in distributed power architectures.

Features:

• Adaptive Constant On-Time (COT) Control: Provides excellent transient response and simplifies design.
• Wide Input Voltage Range: Operates from a wide input voltage range, accommodating various power sources.
• Synchronous Rectification: Improves efficiency by replacing the rectifier diode with a MOSFET.
• Programmable Switching Frequency: Allows optimization of the switching frequency for different applications.
• Over-Current Protection: Protects the converter from damage due to excessive current draw.
• Thermal Shutdown Protection: Prevents overheating and potential damage to the controller.

Benefits:

• High Efficiency: Synchronous rectification and optimized control architecture maximize efficiency.
• Excellent Transient Response: Adaptive COT control provides fast response to load changes.
• Simplified Design: Integrated features simplify circuit design and reduce component count.
• Robust Protection: Over-current and thermal shutdown protection ensure reliable operation.
• Flexible Configuration: Programmable switching frequency allows optimization for different applications.

Technical Specifications: The LM25088MH-1 operates with an input voltage range of 4.5V to 75V. It can drive N-channel MOSFETs for both the control switch and the synchronous rectifier. The switching frequency is programmable from 50kHz to 1MHz. It is available in a HTSSOP-16 package. The operating temperature range is -40°C to +125°C.