LM25116MH

更新时间： 2024-11-15 04:44:39

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	606K
描述
Wide Range Synchronous Buck Controller

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LM25116MH 数据手册

April 2007

LM25116

Wide Range Synchronous Buck Controller

General Description

Features

The LM25116 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. The operating frequency is programmable from

50kHz to 1MHz. The LM25116 drives external high-side and

low-side NMOS power switches with adaptive dead-time con-

trol. A user-selectable diode emulation mode enables discon-

tinuous mode operation for improved efficiency at light load

conditions. A low quiescent current shutdown disables the

controller and consumes less than 10µA of total input current.

Additional features include a high voltage bias regulator, au-

tomatic switch-over to external bias for improved efficiency,

thermal shutdown, frequency synchronization, cycle by cycle

current limit and adjustable line under-voltage lockout. The

device is available in a power enhanced TSSOP-20 package

featuring an exposed die attach pad to aid thermal dissipation.

Emulated peak current mode

■

Wide operating range up to 42V

Low I_Qshutdown (<10µA)

Drives standard or logic level MOSFETs

Robust 3.5A peak gate drive

Free-run or synchronous operation to 1MHz

Optional diode emulation mode

Programmable output from 1.215V to 36V

Precision 1.5% voltage reference

Programmable current limit

Programmable soft-start

Programmable line under-voltage lockout

Automatic switch to external bias supply

TSSOP-20EP exposed pad

Thermal shutdown

■

Typical Application

30015601

300156

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LM25116MH 替代型号

型号	品牌	替代类型	描述	数据表
LM25116MH/NOPB	TI	功能相似	Wide Range Synchronous Buck Controller

与LM25116MH相关器件

型号	品牌	获取价格	描述	数据表
LM25116MH/NOPB	TI	获取价格	Wide Range Synchronous Buck Controller
LM25116MHX	TI	获取价格	Wide Range Synchronous Buck Controller
LM25116MHX	NSC	获取价格	Wide Range Synchronous Buck Controller
LM25116MHX/NOPB	TI	获取价格	Wide Range Synchronous Buck Controller
LM25117	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117PMH	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117PMH/NOPB	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117PMHE	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117PMHE/NOPB	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor
LM25117PMHX	TI	获取价格	Wide Input Range Synchronous Buck Controller with Analog Current Monitor

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