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LM3812

National Semiconductor
Part Number LM3812
Manufacturer National Semiconductor
Description Precision Current Gauge-IC
Published Mar 22, 2005
Detailed Description LM3812/LM3813 Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output June 1999 LM3812/LM3813 Prec...
Datasheet PDF File LM3812 PDF File

LM3812
LM3812

Overview
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.
The shutdown pin can be used to inhibit false triggering during start-up, or to enter a low quiescent current mode.
The LM3812 and LM3813 are factory-set in two different current options.
The sense range is −1A to +1A or −7A to +7A.
The sampling interval for these parts is 50ms.
If faster sampling is desired, please refer to the data sheets for the part numbers LM3814 and LM3815.
Key Specifications n Ultra low insertion loss (typically 0.
004Ω) n 2V to 5.
25V supply range n ± 2% accuracy at room temperature (includes accuracy of the internal sense element) (LM3812-1.
0, LM3813-1.
0) n Low quiescent current in shutdown mode (typically 2.
5 µA) n 50 msec sampling interval 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) Applications n n n n Battery charge/discharge gauge Motion control diagnostics Power supply load monitoring and management Resettable smart fuse Connection Diagrams DS100122-1 DS100122-3 Top View LM3812 for High-Side Sensing Top View LM3813 for Low-Si...


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