(China (Mainland))
Product Summary
The LM3813MX-1.0 is a Precision Current Gauge IC with Ultra Low Loss Sense Element and PWM Output. It provides easy to use precision current measurement with virtually zero insertion loss (typically 0.004Ω). The LM3813MX-1.0 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 LM3813MX-1.0 is 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.
Parametrics
LM3813MX-1.0 absolute maximum ratings: (1) Maximum Supply Voltage: 5.5V; (2)Power Dissipation ESD Susceptibility: 1.5 kV; (3)Sense Current (peak, for 200 msec): 10A; (4)Sink Current for PWM pin: 1mA; (5)Voltage on Pin 5: 5.25V; (6)Maximum Junction Temperature: 150℃; (7)Storage Temperature: -65 to +150℃; (8)Lead Temperature (Soldering, 10 sec): 260℃.
Features
LM3813MX-1.0 features: (1)No external sense element required; (2)PWM output indicates the current magnitude and direction; (3)PWM output can be interfaced with microprocessors; (4)Precision ΔΣ current-sense technique; (5)Low temperature sensitivity; (6)Internal filtering rejects false trips; (7)Internal Power-On-Reset (POR); (8)Ultra low insertion loss (typically 0.004Ω); (9)2V to 5.25V supply range; (10)±2% accuracy at room temperature (includes accuracy of the internal sense element); (11)Low quiescent current in shutdown mode (typically 2.5 μA); (12)50 msec sampling interval.
Diagrams
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IC CURRENT GAUGE PREC EVAL 8SOIC |
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