LM3824 Datasheet | National Semiconductor

Description The LM3824 Current Gauge provides easy to use precision current measurement with virtually zero insertion loss (typically 0.003Ω). The LM3824 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 averaging 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 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 LM3824 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 6ms. If a more precise measurement is required, please refer to LM3822 datasheet. Key Specifications n Ultra low insertion loss (0.003Ω) n 2V to 5.5V supply range n ± 3% 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 6 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 8 m A for 1A part Applications n n n n Battery charge/discharge gauge Motion control diagnostics Power supply load monitoring and management Resettable smart fuse Connection Diagram DS200007-1 Top View LM3824 for High-Side Sensing © 2000 National Semiconductor Corporation DS200007 .national. Ordering Information Order No.- LM3824MM-1.0 LM3824MMX-1.0 LM3824MM-2.0 LM3824MMX-2.0 Sense Range Sampling Interval- 6 ms 6 ms 6 ms 6 ms Sensing Method High-side High-side High-side...