Datasheet > LM3814_05

LM3814_05

更新时间： 2024-09-18 04:43:15

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
14页	709K
描述
Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output

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LM3814_05 数据手册

February 2005

LM3814/LM3815

Fast Current Gauge IC with Ultra Low Loss Sense

Element and PWM Output

3.5% accuracy at room temperature (includes

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

LM3815-1.0)

General Description

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.

n Low quiescent current in shutdown mode (typically 2.5

µA)

n 6 msec sampling interval

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 6 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.

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

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

+7A. The user specifies a particular part number to match

the current 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

Key Specifications

n Ultra low insertion loss (typically 0.004Ω)

n 2V to 5.25V supply range

Connection Diagrams

10101303

Top View

LM3815

10101301

Top View

LM3814

for Low-Side Sensing

for High-Side Sensing

DS101013

www.national.com

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与LM3814_05相关器件

型号	品牌	获取价格	描述	数据表
LM3814-1.0	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3814-7.0	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3814M-1.0	NSC	获取价格	Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
LM3814M-1.0/NOPB	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3814M-7.0	NSC	获取价格	Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
LM3814M-7.0/NOPB	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3814M-7.0/NOPB	ROCHESTER	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3814MX-1.0	NSC	获取价格	Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output
LM3814MX-1.0	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8
LM3814MX-1.0/NOPB	TI	获取价格	2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8, 0.150 INCH, PLASTIC, SOP-8

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