LM3812 - National Semiconductor

LM3812 Precision Current Gauge-IC

The LM3812/LM3813 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.004Ω). The LM3812 is used for high-side sensing and the LM3813 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 averaging function. .

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 n n n Battery charge/discharge gauge Motion control diagnostics Power supply load monitoring and management Resettable smart fuse Connection Diagrams DS100122-1 DS100122-3 Top View LM3812 for High-Side Sensing Top View LM3813 for Low-Side Sensing © 1999 National Semiconductor Corporation .