LM3822MM-2.0 National Semiconductor, LM3822MM-2.0 Datasheet

LM3822MM-2.0

Manufacturer Part Number

LM3822MM-2.0

Description

Manufacturer

National Semiconductor

Datasheets

1.LM3822MM-2.0.pdf (13 pages)

2.LM3822MM-2.0.pdf (12 pages)

3.LM3822MM-2.0.pdf (12 pages)

Specifications of LM3822MM-2.0

Date_code

04+

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LM3822

Precision Current Gauge IC with Internal Zero Ohm

Sense Element and PWM Output

General Description

The LM3822 Current Gauge provides easy to use precision

current measurement with virtually zero insertion loss (typi-

cally 0.003Ω). The LM3822 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 av-

eraging function. Current is averaged over 50 msec time

periods in order to provide immunity to current spikes. The

ICs have a pulse-width modulated (PWM) output which indi-

cates 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 LM3822 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 50ms. If faster sampling is

desired, please refer to the data sheet for the part number

LM3824.

Key Specifications

n Ultra low insertion loss (typically 0.003Ω)

n 2V to 5.5V supply range

Connection Diagram

(includes accuracy of the internal sense element)

2% accuracy at room temperature for the 1A device

DS101249

LM3822 for High-Side Sensing

Top View

n Low quiescent current in shutdown mode (typically

n 50 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 ∆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 1 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

1.8 µA)

direction

and controllers

10124901

November 2000

www.national.com

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