Features and Benefits
- Current Sense Amplifier
- Fast Step Response: 500ns
- Low Offset Voltage: 125μV Maximum
- Low Gain Error: 0.2% Maximum
- Internal 400mV Precision Reference
- Internal Latching Comparators with Reset
- Fast Response Time: 500ns
- Total Threshold Error: ±1.25% Maximum
- Two Comparator Polarity Options
- Wide Supply Range: 2.7V to 60V
- Supply Current: 550μA
- Low Shutdown Current: 5μA Maximum
- Specified for –40°C to 125°C Temperature Range
- Available in 10-Lead MSOP Package
The LT6109 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and two comparators. Two versions of the LT6109 are available. The LT6109-1 has the comparators connected in opposing polarity and the LT6109-2 has the comparators connected in the same polarity. In addition, the current sense amplifier and comparator inputs and outputs are directly accessible. The amplifier gain and comparator trip points are configured by external resistors. The open-drain comparator outputs allows for easy interface to other system components.
The overall propagation delay of the LT6109 is typically only 1.4μs, allowing for quick reaction to overcurrent and undercurrent conditions. The 1MHz bandwidth allows the LT6109 to be used for error detection in critical applications such as motor control. The high threshold accuracy of the comparators, combined with the ability to latch both comparators, ensures the LT6109 can capture high speed events.
The LT6109 is fully specified for operation from –40°C to 125°C, making it suitable for industrial and automotive applications. The LT6109 is available in a small 10-lead MSOP.
- Overcurrent, Undercurrent and Fault Detection
- Current Shunt Measurement
- Battery Monitoring
- Motor Control
- Automotive Monitoring and Control
- Remote Sensing
- Industrial Control
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
DC1659A-A: Demo Board for the LT6109 High Side Current Sense Amplifier with Reference and Comparators.
DC1659A-B: Demo Board for the LT6109 High Side Current Sense Amplifier with Reference and Comparators.
Documentation & Resources
R515 Reliability Data3/26/201835 K
DC1659A - Demo Manual8/16/2011698K
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LT6109 Companion Parts
Recommended Related Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.