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| 型號： | LM3815MX-1.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 264K |
| 代理商： | LM3815MX-1.0 |
LM3814/LM3815
Fast Current Gauge IC with Ultra Low Loss Sense
Element and PWM Output
General Description
The LM3814/LM3815 Current Gauges provide easy to use
precision current measurement with virtually zero insertion
loss (typically 0.004
). The LM3814 is used for high-side
sensing and the LM3815 is used for low-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 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.
Key Specifications
n
Ultra low insertion loss (typically 0.004
)
n
2V to 5.25V supply range
n
±
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
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)
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
Top View
LM3814
for High-Side Sensing
DS101013-3
Top View
LM3815
for Low-Side Sensing
January 1999
L
1999 National Semiconductor Corporation
DS101013
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3815MX-7.0 | 功能描述:IC CURRENT GAUGE 6% 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)流/電流管理 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 功能:電流開關 檢測方法:- 精確度:±10% 輸入電壓:1.7 V ~ 5.5 V 電流 - 輸出:600mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-UFQFN 供應商設備封裝:10-UTQFN（1.4x1.8） 包裝:管件 |
| LM381A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM381AN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM381/LM381A Low Noise Dual Preamplifier |
| LM381AN/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Dual Audio Preamp |
| LM381AN/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Dual Audio Preamp |
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