LM3824MM-1.0 ,Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM OutputPin Description (High-Side, LM3824)Pin Name Function1 SENSE+, V High side of internal current sense ..
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LM3824MM-1.0-LM3824MM-2.0
Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output
LM3824
Precision Current Gauge IC with Internal Zero Ohm
Sense Element and PWM Output
General DescriptionThe LM3824 Current Gauge provides easyto use precision
current measurement with virtually zero insertion loss (typi-
cally 0.003Ω). The LM3824is usedfor high-side sensing. Delta Sigma analogto digital converteris incorporatedto
precisely measurethe current andto providea current aver-
aging function. Currentis averaged over6 msec time peri-
odsin orderto provide immunityto current spikes. The ICs
havea pulse-width modulated (PWM) output which indicates
the current magnitude and direction. The shutdownpin can usedto inhibit false triggering during start-up,orto enter low quiescent current mode.
The LM3824is factory-setin two different current options.
The sense rangeis −1.0Ato +1.0Aor −2.0Ato +2.0A. The
sampling intervalfor this partis 6ms.Ifa more precise mea-
surementis required, please referto LM3822 datasheet.
Key Specifications Ultra low insertion loss (0.003Ω)2Vto 5.5V supply range ±3% accuracyat room temperatureforthe1A device
(includes accuracyofthe internal sense element) Low quiescent currentin shutdown mode
(typically1.8 μA)6 msec sampling intervalIn MSOP-8 Package
Features No external sense element required PWM output indicatesthe current magnitude and
direction PWM outputis easily interfaced with microprocessors
and controllers PrecisionΔΣ current-sense technique Low temperature sensitivity Internal filtering rejects false trips Internal Power-On-Reset (POR) DC Offsetis less than8 mAfor1A part
Applications Battery charge/discharge gauge Motion control diagnostics Power supply load monitoring and management Resettable smart fuse
Connection DiagramDS200007-1
Top View
LM3824for High-Side SensingJuly 2000
LM3824
Precision
Current
Gauge
with
Internal
Zero
Ohm
Sense
Element
and
PWM
Output
