LM25085-Q1

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM25085, LM25085-Q1 SNVS593J – OCTOBER 2008 – REVISED NOVEMBER 2014 LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller 1 Features 1 LM25085-Q1 is an Automotive Grade product that is AEC-Q100 Grade 1 Qualified (-40°C to 125°C Operating Junction Temperature) Wide 4.5V to 42V 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 1.25V Precision ±2% Feedback Reference Capable of 100% Duty Cycle Operation Internal Soft-Start Timer Integrated High Voltage Bias Regulator Thermal Shutdown 2 Applications Automotive Infotainment Battery/Super Capacitor Chargers LED Drivers 3 Description The LM25085 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 4.5V to 42V 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 remains nearly constant with line and ...