Texas Instruments LM5116 Synchronous Buck Controller, 6V to 100V, 1MHz, HTSSOP-

The Texas Instruments LM5116 is a high-performance synchronous buck controller designed for demanding step-down regulator applications. It is engineered to operate from a high-voltage or widely varying input supply, making it exceptionally versatile for power management solutions where input stability cannot be guaranteed.

Its control method is based on advanced current mode control, which utilises an emulated current ramp. This architecture provides significant advantages, including inherent line feed-forward for improved response to input voltage changes, robust cycle-by-cycle current limiting for enhanced protection, and simplified ease-of-loop compensation for faster design integration.

A key feature is the use of an emulated control ramp, which dramatically reduces the noise sensitivity of the pulse-width modulation (PWM) circuit. This allows for reliable and precise control of very small duty cycles, a critical requirement in high-input voltage applications where maintaining efficiency and stability is paramount.

Specifications & Features

• Control Mode: Advanced current mode control with emulated ramp
• Input Voltage Range: Wide 6V to 100V supply
• Maximum Duty Cycle: High 98% efficiency
• Switching Frequency: 1MHz operation for compact design
• Topology: Synchronous buck (step-down) controller
• Outputs: Single output configuration
• Operating Temperature: Robust -40°C to 150°C range
• Package: Compact 20-pin HTSSOP (Heatsink Thin Shrink Small Outline Package)

This controller is an ideal choice for industrial, automotive, and telecommunications systems requiring efficient, reliable power conversion from high-voltage sources. Its combination of wide input range, high-frequency operation, and noise-immune control makes it a cornerstone component for advanced power supply designs.