lm25085asdx National Semiconductor Corporation, lm25085asdx Datasheet

lm25085asdx

Manufacturer Part Number

lm25085asdx

Description

42v Constant On-time Pfet Buck Switching Controller With 0.9v Reference

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM25085ASDX.pdf (24 pages)

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

lm25085asdx/NOPB

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Quantity:

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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 4.5V

to 42V input range. The constant on-time regulation principle

requires no loop compensation, simplifies circuit implemen-

tation, 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 R

used to sense current for over-current detection.

Typical Application, Basic Step Down Controller

DS(ON)

of the PFET or an external sense resistor can be

300852

LM25085A

Features

■

Package

■

Wide 4.5V to 42V input voltage range

Adjustable current limit using R

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

MSOP-8EP

MSOP-8

LLP-8 (3 mm x 3 mm)

DS(ON)

or a current sense

March 16, 2009

www.national.com

30085201

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