LM3814

Features: · No external sense element required· PWM output indicates the current magnitude and direction· PWM output can be interfaced with microprocessors· Precision DS current-sense technique· Low temperature sensitivity· Internal filtering rejects false trips· Internal Power-On-Reset (POR)Appli...

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SeekIC No. : 004395457 Detail

LM3814: Features: · No external sense element required· PWM output indicates the current magnitude and direction· PWM output can be interfaced with microprocessors· Precision DS current-sense technique· Low...

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Part Number:
LM3814
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/5/24

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Product Details

Description



Features:

· No external sense element required
· PWM output indicates the current magnitude and direction
· PWM output can be interfaced with microprocessors
· Precision DS current-sense technique
· Low temperature sensitivity
· Internal filtering rejects false trips
· Internal Power-On-Reset (POR)






Application

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






Pinout

  Connection Diagram




Specifications

Absolute Maximum Supply Voltage 5.5V
Power Dissipation (Note 2)
ESD Susceptibility (Note 3) 1.5 kV
Sense Current (peak, for 200 msec) (Note 4) 10A
Sink Current for PWM pin 1 mA
Voltage on Pin 55.25V
Maximum Junction Temperature 150
Storage Temperature −65 to +150
Lead Temperature (Soldering, 10 sec) 260


Sense Current Range (+/-) 1, 7 Amp
Sense Element Resistance 0.004 Ohm
Sense Accuracy 6, 3.5 %
Sensing Type High side
Sampling Interval 0.006 sec
Input Min Voltage 2 Volt
Input Max Voltage 5.25 Volt
Iq in Shutdown (typ) 0.0025 mA
Switching Frequency 0.160 kHz
Watchdog No
On/Off Pin Yes
Temperature Min -40 deg C
Temperature Max 125 deg C
RegType Current Gauge
View Using Catalog





Description

The LM3814/LM3815 Current Gauges provide easy to use precision current measurement with virtually zero insertion
loss (typically 0.004W). The LM3814 is used for high-side sensing and the LM3815 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 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 LM3814 and LM3815 are factory-set in two different current ptions. The sense range is −1A to +1A or −7A to +7A.
The user specifies a particular part number to match the current range for a given application. The sampling interval for these parts is 6ms. If larger sampling interval is desired for better accuracy, please refer to the data sheets for the part numbers LM3812 and LM3813.






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