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LM3822MMX-2.0 データシート(PDF) 1 Page - National Semiconductor (TI) |
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LM3822MMX-2.0 データシート(HTML) 1 Page - National Semiconductor (TI) |
1 / 12 page 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 0.003 Ω). 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 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. 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 0.003 Ω) n 2V to 5.5V supply range n ± 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 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 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 July 2000 © 2000 National Semiconductor Corporation DS101249 www.national.com |
同様の部品番号 - LM3822MMX-2.0 |
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同様の説明 - LM3822MMX-2.0 |
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