Datasheet > LM34937

LM34937

更新时间： 2024-11-09 11:58:15

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
31页	722K
描述
Wide Input Range Synchronous Buck Controller

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LM34937 数据手册

May 23, 2012

LM34937/LM34937Q

Wide Input Range Synchronous Buck Controller

General Description

Features

■

The LM34937 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.

LM34937Q 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

Free-run or synchronizable clock up to 650kHz

Optional diode emulation mode

■

Programmable output from 0.8V

Precision 1.5% voltage reference

Programmable current limit

The operating frequency is programmable from 50 kHz to 650

kHz. The LM34937 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. Additional features include

thermal shutdown, frequency synchronization, hiccup mode

current limit and adjustable line under-voltage lockout.

Hiccup mode over current protection

Programmable soft-start and tracking

Programmable line under-voltage lockout

Thermal shutdown

Packages

TSSOP-20EP (Thermally enhanced)

■

LLP-24 (4mmx4mm)

Typical Application

30191101

301911 SNVS809

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