Datasheet > LM25088

LM25088

更新时间： 2024-11-15 05:42:03

品牌	Logo	应用领域
美国国家半导体 - NSC		控制器
页数	文件大小	规格书
26页	518K
描述
Wide Input Range Non-Synchronous Buck Controller

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LM25088 数据手册

June 5, 2009

LM25088

Wide Input Range Non-Synchronous Buck Controller

General Description

Features

The LM25088 high voltage non-synchronous buck controller

features all the necessary functions to implement an efficient

high voltage buck converter using a minimum number of ex-

ternal components. The LM25088 can be configured to op-

erate over an ultra-wide input voltage range of 4.5V to 42V.

This easy to use controller includes a level shifted gate driver

capable of controlling an external N-channel buck switch. The

control method is based upon peak current mode control uti-

lizing an emulated current ramp. The use of an emulated

control ramp reduces noise sensitivity of the pulse-width mod-

ulation circuit, allowing reliable control of very small duty

cycles necessary in high input voltage/low output voltage ap-

plications. The LM25088 switching frequency is pro-

grammable from 50 kHz to 1 MHz.

Emulated current mode control

■

Drives external high-side N-channel MOSFET

Ultra-wide input voltage range from 4.5V to 42V

Low I_QShutdown and Standby modes

High duty cycle ratio feature for reduced dropout voltage

Spread spectrum EMI reduction (LM25088-1)

Hiccup timer for overload protection (LM25088-2)

Adjustable output voltage from 1.205V with 1.5% feedback

reference accuracy

Wide bandwidth error amplifier

■

Single resistor oscillator frequency setting

Oscillator synchronization capability

The LM25088 is available in two versions: The LM25088-1

provides a +/-5% frequency dithering function to reduce the

conducted and radiated EMI, while the LM25088-2 provides

a versatile restart timer for overload protection. Additional

features include a low dropout bias regulator, tri-level enable

input to control shutdown and standby modes, soft-start and

oscillator synchronization capability. The device is available

in a thermally enhanced TSSOP-16EP pin package.

Programmable soft-start

High voltage, low dropout bias regulator

Thermal shutdown protection

Package

TSSOP-16EP

■

Simplified Application Schematic

30087601

300876

www.national.com

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与LM25088相关器件

型号	品牌	获取价格	描述	数据表
LM25088_15	TI	获取价格	LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller
LM25088MH-1	NSC	获取价格	Wide Input Range Non-Synchronous Buck Controller
LM25088MH-1/NOPB	TI	获取价格	LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller
LM25088MH-2	NSC	获取价格	Wide Input Range Non-Synchronous Buck Controller
LM25088MH-2/NOPB	TI	获取价格	LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller
LM25088MHX-1	NSC	获取价格	Wide Input Range Non-Synchronous Buck Controller
LM25088MHX-1/NOPB	TI	获取价格	LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller
LM25088MHX-2	NSC	获取价格	Wide Input Range Non-Synchronous Buck Controller
LM25088MHX-2/NOPB	TI	获取价格	LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller
LM25088-Q1	TI	获取价格	LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller

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