Datasheet > LM3824

LM3824

更新时间： 2024-09-17 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		仪表
页数	文件大小	规格书
12页	269K
描述
Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output

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LM3824 数据手册

July 2000

LM3824

Precision Current Gauge IC with Internal Zero Ohm

Sense Element and PWM Output

General Description

The LM3824 Current Gauge provides easy to use precision

current measurement with virtually zero insertion loss (typi-

cally 0.003Ω). The LM3824 is used for high-side sensing.

Key Specifications

n Ultra low insertion loss (0.003Ω)

n 2V to 5.5V supply range

3% accuracy at room temperature for the 1A device

(includes accuracy of the internal sense element)

n Low quiescent current in shutdown mode

(typically 1.8 µA)

n 6 msec sampling interval

n In MSOP-8 Package

A Delta Sigma analog to digital converter is incorporated to

precisely measure the current and to provide a current aver-

aging function. Current is averaged over 6 msec time peri-

ods in order to provide immunity to current spikes. The ICs

have a pulse-width modulated (PWM) output which indicates

the current magnitude and direction. The shutdown pin can

be used to inhibit false triggering during start-up, or to enter

a low quiescent current mode.

Features

n No external sense element required

n PWM output indicates the current magnitude and

direction

n PWM output is easily interfaced with microprocessors

and controllers

The LM3824 is factory-set in two different current options.

The sense range is −1.0A to +1.0A or −2.0A to +2.0A. The

sampling interval for this part is 6ms. If a more precise mea-

surement is required, please refer to LM3822 datasheet.

n Precision ∆Σ current-sense technique

n Low temperature sensitivity

n Internal filtering rejects false trips

n Internal Power-On-Reset (POR)

n DC Offset is less than 8 mA for 1A part

Applications

n Battery charge/discharge gauge

n Motion control diagnostics

n Power supply load monitoring and management

n Resettable smart fuse

Connection Diagram

DS200007-1

Top View

LM3824 for High-Side Sensing

DS200007

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