LM3824 National Semiconductor, LM3824 Datasheet

LM3824

Manufacturer Part Number

LM3824

Description

Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output

Manufacturer

National Semiconductor

Datasheet

1.LM3824.pdf (12 pages)

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

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.

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.

Connection Diagram

DS200007

LM3824 for High-Side Sensing

Top View

Key Specifications

n Ultra low insertion loss (0.003 )

n 2V to 5.5V supply range

n Low quiescent current in shutdown mode

n 6 msec sampling interval

n In MSOP-8 Package

Features

n No external sense element required

n PWM output indicates the current magnitude and

n PWM output is easily interfaced with microprocessors

n Precision

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

(includes accuracy of the internal sense element)

(typically 1.8 µA)

direction

and controllers

3% accuracy at room temperature for the 1A device

DS200007-1

current-sense technique

www.national.com

July 2000

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