LM25085A - 具有 0.9V 参考的 42V 宽输入电压恒定导通时间 PFET 降压开关控制器

LM25085A是TI德州仪器公司的一款控制器（外部开关）产品，LM25085A是具有 0.9V 参考的 42V 宽输入电压恒定导通时间 PFET 降压开关控制器，本站介绍了LM25085A的封装应用图解、特点和优点、功能等，并给出了与LM25085A相关的TI元器件型号供参考。

LM25085A - 具有 0.9V 参考的 42V 宽输入电压恒定导通时间 PFET 降压开关控制器 - 控制器（外部开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM25085A is a functional variant of the LM25085 COT PFET Buck Switching Controller. The functional differences of the LM25085A are: The feedback reference voltage is 0.9V, the forced off-time after current limit detection is longer, and the soft-start time is shorter (1.8 ms).

The LM25085A 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.

产品特性

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 0.9V
Precision ±2% Feedback Reference
Capable of 100% Duty Cycle Operation
Internal Soft-Start Timer
Integrated High Voltage Bias Regulator
Thermal Shutdown

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