LM3812/LM3813 Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output June 1999 LM3812/LM3813 Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output General Description 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.
Current is averaged over 50 msec time periods in order to provide immunity to current spikes.
The ICs have a pulse-width modulat...

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