|
Features
No external sense element required
PWM output indicates the current magnitude and direction
PWM output is easily interfaced with microprocessors and controllers
Precision [Delta][Sigma] current-sense technique
Low temperature sensitivity
Internal filtering rejects false trips
Internal Power-On-Reset (POR)
DC Offset is less than 8 mA for 1A part
Description The LM3824 Current Gauge provides easy to use precision current measurement with virtually zero insertion loss (typically 0.003Ohm). The LM3824 is used for high-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. The shutdown pin can be used to inhibit false triggering during start-up, or to enter a low quiescent current mode.
The LM3824 is factory-set in two different current options. The sense range is -1.0A to +1.0A or -2.0A to +2.0A. The sampling interval for this part is 6ms. If a more precise measurement is required, please refer to LM3822 datasheet.
Key Specification
Ultra low insertion loss (0.003Ohm)
2V to 5.5V supply range
±3% accuracy at room temperature for the 1A device (includes accuracy of the internal sense element)
Low quiescent current in shutdown mode (typically 1.8 µA)
6 msec sampling interval
In MSOP-8 Package
Applications
Battery charge/discharge gauge
Motion control diagnostics
Power supply load monitoring and management
Resettable smart fuse
| 
