HomedatasheetLM3822MM-1.0

LM3822MM-1.0 Datasheet

Precision Current Gauge IC with Internal Zero Ohm Sense Element and PWM Output
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Description

DESCRIPTION
The LM3822 Current Gauge provides easy to use precision current measurement with virtually zero insertion loss (typically 0.003Ω). The LM3822 is used for high-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 LM3822 is factory-set in two different current options. The sense range is −1.0A to +1.0A or −2.0A to +2.0A. The sampling interval for this part is 50ms. If faster sampling is desired, please refer to the data sheet for the part number LM3824.

FEATURES
• No External Sense Element Required
• PWM Output Indicates the Current Magnitude
   and Direction
• PWM Output is Easily Interfaced with
   Microprocessors and Controllers
• Precision ΔΣ Current-Sense Technique
• Low Temperature Sensitivity
• Internal Filtering Rejects False Trips
• Internal Power-On-Reset (POR)
• DC Offset is Less than 1 mA for 1A Part

APPLICATIONS
• Battery Charge/Discharge Gauge
• Motion Control Diagnostics
• Power Supply Load Monitoring and
   Management
• Resettable Smart Fuse

KEY SPECIFICATIONS
• Ultra Low Insertion Loss (Typically 0.003Ω)
• 2V to 5.5V Supply Range
• ±2% Accuracy at Room Temperature for the 1A
   Device (Includes Accuracy of the Internal
   Sense Element)
• Low Quiescent Current in Shutdown Mode
   (Typically 1.8 µA)
• 50 msec Sampling Interval
• In MSOP-8 Package

Features

Parameters


Manufacturer information

TEXAS INSTRUMENTS

Texas Instruments introduction - Texas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today.

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