Texas Instruments LM3814MX-1.0

Description
The LM3814/LM3815 Current Gauges provide precise current measurement with virtually zero insertion loss (typically 0.004Ω). The LM3814 is used for high-side sensing, while the LM3815 is used for low-side sensing. A Delta Sigma analog-to-digital converter is incorporated to measure the current and provide a current averaging function. Current is averaged over 6 ms time periods for immunity to current spikes. The ICs have a pulse-width modulated (PWM) output that 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.

Features
Ultra-low insertion loss (typically 0.004Ω)
2 V to 5.25 V supply range
±3.5% accuracy at room temperature (includes accuracy of the internal sense element) (LM3814-1.0, LM3815-1.0)
Low quiescent current in shutdown mode (typically 2.5 µA)
6 ms sampling interval
No external sense element required
PWM output indicates the current magnitude and direction
PWM output can be interfaced with microprocessors
Precision ΔΣ current-sense technique
Low temperature sensitivity
Internal filtering rejects false trips
Internal Power-On-Reset (POR)

Applications
Battery charge/discharge gauge
Motion control diagnostics
Power supply load monitoring and management
Resettable smart fuse