LM25085QMYX/NOPB PMIC - 稳压器 - DC DC 切换控制器

LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller

1 Features

• 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 ultra-fast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.