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LM25085A - 42V Constant On-Time PFET Buck Switching Controller

Description

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).

Features

  • 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 b.

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LM25085A 42V Constant On-Time PFET Buck Switching Controller www.DataSheet4U.com March 16, 2009 LM25085A 42V Constant On-Time PFET Buck Switching Controller with 0.9V Reference General Description 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.
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