Datasheet > LM3822MM-2.0

LM3822MM-2.0

更新时间： 2024-11-07 22:12:15

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美国国家半导体 - NSC		仪表
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描述
Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output

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LM3822MM-2.0 数据手册

July 2000

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.

Key Specifications

n Ultra low insertion loss (typically 0.003Ω)

n 2V to 5.5V supply range

2% 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 50 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 50 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 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.

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

Connection Diagram

DS101249-1

Top View

LM3822 for High-Side Sensing

DS101249

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LM3822MM-2.0/NOPB	TI	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO8, MSOP-8
LM3822MMX-1.0	NSC	获取价格	Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output
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LM3824	NSC	获取价格	Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output
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LM3824MM-1.0	NSC	获取价格	Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output
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