High Side Current Sense Amplifier with Reference and Comparator

The LT6108 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and a comparator. Two versions of the LT6108 are available. The LT6108-1 has a latching comparator and the LT6108-2 has a non-latching comparator. In addition, the current sense amplifier and comparator inputs and outputs are directly accessible. The amplifier gain and comparator trip point are configured by external resistors. The open-drain comparator output allows for easy interface to other system components.

The overall propagation delay of the LT6108 is typically only 1.4μs, allowing for quick reaction to overcurrent conditions. The 1MHz bandwidth allows the LT6108 to be used for error detection in critical applications such as motor control. The high threshold accuracy of the comparator, combined with the ability to latch the comparator, ensures the LT6108 can capture high speed events.

The LT6108 is fully specified for operation from –40°C to 125°C, making it suitable for industrial and automotive applications. The LT6108 is available in the small 8-lead MSOP and 8-lead DFN packages.

Applications

* Overcurrent and Fault Detection

* Current Shunt Measurement

* Battery Monitoring

* Motor Control

* Automotive Monitoring and Control

* Remote Sensing

* Industrial Control

* Current Sense Amplifier

* Fast Step Response: 500ns

* Low Offset Voltage: 125μV Maximum

* Low Gain Error: 0.2% Maximum

* Internal 400mV Precision Reference

* Internal Comparator

* Fast Response Time: 500ns

* Total Threshold Error: ±1.25% Maximum

* Latching or Non-Latching Comparator Option

* Wide Supply Range: 2.7V to 60V

* Supply Current: 450μA

* Low Shutdown Current: 5μA Maximum

* Specified for –40°C to 125°C Temperature Range

* Available in 8-Lead MSOP and 8-Lead (2mm × 3mm) DFN Packages