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LM25117QPMHE

更新时间： 2024-11-15 12:21:39

品牌	Logo	应用领域
德州仪器 - TI		监控控制器
页数	文件大小	规格书
33页	703K
描述
Wide Input Range Synchronous Buck Controller with Analog Current Monitor

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LM25117QPMHE 数据手册

April 10, 2012

LM25117/LM25117Q

Wide Input Range Synchronous Buck Controller with

Analog Current Monitor

General Description

Features

The LM25117 is a synchronous buck controller intended for

step-down regulator applications from a high voltage or widely

varying input supply. The control method is based upon cur-

rent mode control utilizing an emulated current ramp. Current

mode control provides inherent line feed-forward, cycle-by-

cycle current limiting and ease of loop compensation. The use

of an emulated control ramp reduces noise sensitivity of the

pulse-width modulation circuit, allowing reliable control of

very small duty cycles necessary in high input voltage appli-

cations.

LM25117Q is an Automotive Grade product that is AEC-

■

Q100 grade 1 qualified (-40°C to +125°C operating

junction temperature)

Emulated peak current mode control

■

Wide operating range from 4.5V to 42V

Robust 3.3A peak gate drives

Adaptive dead-time output driver control

Free-run or synchronizable clock up to 750kHz

Optional diode emulation mode

The operating frequency is programmable from 50 kHz to 750

kHz. The LM25117 drives external high-side and low-side

NMOS power switches with adaptive dead-time control. A us-

er-selectable diode emulation mode enables discontinuous

mode operation for improved efficiency at light load condi-

tions. A high voltage bias regulator that allows external bias

supply further improves efficiency. The LM25117’s unique

analog telemetry feature provides average output current in-

formation. Additional features include thermal shutdown, fre-

quency synchronization, hiccup mode current limit and

adjustable line under-voltage lockout.

Programmable output from 0.8V

Precision 1.5% voltage reference

Analog current monitor

Programmable current limit

Hiccup mode over current protection

Programmable soft-start and tracking

Programmable line under-voltage lockout

Programmable switch-over to external bias supply

Thermal shutdown

Packages

TSSOP-20EP (Thermally enhanced)

■

LLP-24 (4mmx4mm)

Typical Application

30155001

301550 SNVS714D

www.ti.com

12 3 4 5 6 7...33

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与LM25117QPMHE相关器件

型号	品牌	获取价格	描述	数据表
LM25117QPMHE/NOPB	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117QPMHX	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117QPMHX/NOPB	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117QPSQ	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117QPSQ/NOPB	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117QPSQE	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117QPSQE/NOPB	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117QPSQX	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117QPSQX/NOPB	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25118	TI	获取价格	LM25118/LM25118Q Wide Voltage Range Buck-Boost Controller

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