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LM3814 - Fast Current Gauge-IC

This page provides the datasheet information for the LM3814, a member of the LM3 Fast Current Gauge-IC family.

Description

The LM3814/LM3815 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.004Ω).

The LM3814 is used for high-side sensing and the LM3815 is used for low-side sensing.

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).

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LM3814/LM3815 Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output January 1999 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 0.004Ω). 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 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.
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