LM51561H-Q1

The LM51561H-Q1 is a high-efficiency, 48V-rated buck converter designed for automotive and industrial applications requiring robust power management. It supports input voltages up to 60V, making it suitable for harsh environments such as those found in electric vehicles and heavy machinery. The device integrates a high-side N-channel MOSFET driver capable of delivering up to 3A peak current, enabling efficient switching at frequencies up to 1 MHz, which reduces the size of external passive components. This converter features an adaptive on-time control architecture that ensures stable operation across a wide range of load conditions without the need for complex loop compensation. It includes built-in protections such as over-current protection (OCP), over-voltage protection (OVP), thermal shutdown, and under-voltage lockout (UVLO), enhancing system reliability and safety. The integrated current sense resistor allows for precise current monitoring and fast transient response, critical for maintaining voltage regulation during dynamic load changes. Designed for AEC-Q100 Grade 1 qualification, the LM51561H-Q1 meets stringent automotive standards for temperature range (-40°C to +125°C) and electromagnetic compatibility (EMC). Its compact 16-pin HTSSOP package offers a space-efficient solution for densely populated PCB designs. The device also supports remote sensing for improved output accuracy and can be configured via an external resistor network for flexibility in design implementation. Applications include battery-powered systems, DC-DC power modules, onboard chargers, and motor drives where high efficiency, small form factor, and compliance with automotive requirements are essential. The LM51561H-Q1 enables designers to achieve high power density while minimizing heat generation and component count, resulting in cost-effective and reliable power solutions.