LM5085

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM5085, LM5085-Q1 SNVS565I – NOVEMBER 2008 – REVISED AUGUST 2015 LM5085/-Q1 75-V Constant On-Time PFET Buck Switching Controller 1 Features 1 LM5085-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (–40°C to 125°C Operating Junction Temperature) Wide 4.5-V to 75-V Input Voltage Range Adjustable Current Limit Using RDS(ON) or a Current Sense Resistor Programmable Switching Frequency to 1MHz No Loop Compensation Required Ultra-Fast Transient Response Nearly Constant Operating Frequency with Line and Load Variations Adjustable Output Voltage from 1.25 V Precision ±2% Feedback Reference Capable of 100% Duty Cycle Operation Internal Soft-start Timer Integrated High Voltage Bias Regulator Thermal Shutdown Package: – HVSSOP-8 – VSSOP-8 – WSON-8 2 Applications Automotive Infotainment Battery/Super Capacitor Chargers LED Drivers 3 Description The LM5085 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5-V to 75-V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultrafast load transient response. The operating frequency...