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LM3814

National Semiconductor
Part Number LM3814
Manufacturer National Semiconductor
Description Fast Current Gauge-IC
Published Mar 22, 2005
Detailed Description LM3814/LM3815 Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output January 1999 LM3814/LM3815 Fast C...
Datasheet PDF File LM3814 PDF File

LM3814
LM3814

Overview
LM3814/LM3815 Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output January 1999 LM3814/LM3815 Fast Current Gauge IC with Ultra Low Loss Sense Element and PWM Output General Description The LM3814/LM3815 Current Gauges provide easy to use precision current measurement with virtually zero insertion loss (typically 0.
004Ω).
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 options.
The sense range is −1A to +1A or −7A to +7A.
The us...


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