Datasheet > LM3815M-1.0

LM3815M-1.0

更新时间： 2024-09-17 22:18:31

品牌	Logo	应用领域
美国国家半导体 - NSC		光电二极管仪表
页数	文件大小	规格书
14页	267K
描述
Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output

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LM3815M-1.0 数据手册

January 1999

LM3814/LM3815

Fast Current Gauge IC with Ultra Low Loss Sense

Element and PWM Output

General Description

Key Specifications

n Ultra low insertion loss (typically 0.004Ω)

n 2V to 5.25V supply range

The LM3814/LM3815 Current Gauges provide easy to use

precision current measurement with virtually zero insertion

loss (typically 0.004Ω). The LM3814 is used for high-side

sensing and the LM3815 is used for low-side sensing.

3.5% accuracy at room temperature (includes

accuracy of the internal sense element) (LM3814-1.0,

LM3815-1.0)

n Low quiescent current in shutdown mode (typically 2.5

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.

µA)

n 6 msec sampling interval

Features

n No external sense element required

n PWM output indicates the current magnitude and

direction

n PWM output can be 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)

The LM3814 and LM3815 are factory-set in two different cur-

rent options. The sense range is −1A to +1A or −7A to +7A.

The user specifies a particular part number to match the cur-

rent range for a given application. The sampling interval for

these parts is 6ms. If larger sampling interval is desired for

better accuracy, please refer to the data sheets for the part

numbers LM3812 and LM3813.

Applications

n Battery charge/discharge gauge

n Motion control diagnostics

n Power supply load monitoring and management

n Resettable smart fuse

Connection Diagrams

DS101013-1

DS101013-3

Top View

LM3814

for High-Side Sensing

Top View

LM3815

for Low-Side Sensing

DS101013

www.national.com

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与LM3815M-1.0相关器件

型号	品牌	获取价格	描述	数据表
LM3815M-1.0/NOPB	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3815M-7.0	NSC	获取价格	Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
LM3815M-7.0	ROCHESTER	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3815M-7.0/NOPB	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3815MX-1.0	NSC	获取价格	Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
LM3815MX-1.0	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3815MX-7.0	NSC	获取价格	Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
LM3815MX-7.0	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3815MX-7.0/NOPB	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3815X-1.0	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8

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