LM25085

更新时间： 2024-11-15 11:54:43

品牌	Logo	应用领域
美国国家半导体 - NSC		开关控制器
页数	文件大小	规格书
24页	482K
描述
42V Constant On-Time PFET Buck Switching Controller

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LM25085 数据手册

December 17, 2009

LM25085

42V Constant On-Time PFET Buck Switching Controller

General Description

Features

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 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_DS(ON)of the PFET or an external sense resistor can be

used to sense current for over-current detection.

LM25085Q 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 R_DS(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

Package

MSOP-8EP

■

MSOP-8

LLP-8 (3 mm x 3 mm)

Typical Application, Basic Step Down Controller

30079301

300793

www.national.com

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与LM25085相关器件

型号	品牌	获取价格	描述	数据表
LM25085_15	TI	获取价格	LM25085 / -Q1 42V Constant On-Time PFET Buck Switching Controller
LM25085A	NSC	获取价格	42V Constant On-Time PFET Buck Switching Controller with 0.9V Reference
LM25085A	TI	获取价格	42V Constant On-Time PFET Buck Switching Controller
LM25085AMM	NSC	获取价格	42V Constant On-Time PFET Buck Switching Controller with 0.9V Reference
LM25085AMM/NOPB	TI	获取价格	4.5-42V Wide Vin, Constant On-Time Non-Synchronous PFET Buck Controller with 0.9V Referenc
LM25085AMME	NSC	获取价格	42V Constant On-Time PFET Buck Switching Controller with 0.9V Reference
LM25085AMME/NOPB	TI	获取价格	4.5V 至 42V 宽输入电压、恒定导通时间非同步、0.9V 基准电压 PFET 降压控
LM25085AMMX	NSC	获取价格	42V Constant On-Time PFET Buck Switching Controller with 0.9V Reference
LM25085AMMX/NOPB	TI	获取价格	4.5V 至 42V 宽输入电压、恒定导通时间非同步、0.9V 基准电压 PFET 降压控
LM25085AMY	NSC	获取价格	42V Constant On-Time PFET Buck Switching Controller with 0.9V Reference