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LM3812M-7.0 Datasheet

  • LM3812M-7.0

  • Precision Current Gauge IC with Ultra Low Loss Sense Element...

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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 0.004鈩?. 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 aver-
aging function. Current is averaged over 50 msec time peri-
ods 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 cur-
rent options. The sense range is 鈭?A to +1A or 鈭?A to +7A.
The sampling interval for these parts is 50ms. If faster sam-
pling is desired, please refer to the data sheets for the part
numbers LM3814 and LM3815.
Key Specifications
n
Ultra low insertion loss (typically 0.004鈩?
n
2V to 5.25V supply range
n
鹵
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 碌A)
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
鈭單?/div>
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-Side Sensing
漏 1999 National Semiconductor Corporation
DS100122
www.national.com

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