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LM3812 - Precision Current Gauge-IC

Download the LM3812 datasheet PDF. This datasheet also covers the LM3 variant, as both devices belong to the same precision current gauge-ic family and are provided as variant models within a single manufacturer datasheet.

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.

Key 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).

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (LM3-812.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by National Semiconductor (now Texas Instruments)

Part Number Description
LM381 LM381/LM381A Low Noise Dual Preamplifier
LM3813 Precision Current Gauge-IC
LM3814 Fast Current Gauge-IC
LM3815 Fast Current Gauge-IC
LM381A LM381/LM381A Low Noise Dual Preamplifier

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
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 modulated (PWM) output which indicates the current magnitude and direction.