Datasheet LT6109-1, LT6109-2 (Analog Devices)

LT6109-1/LT6109-2 High Side Current Sense Amplifier with Reference and Comparators
FEATURES DESCRIPTION
n Current Sense Amplifier The LT®6109 is a complete high side current sense device – Fast Step Response: 500ns that incorporates a precision current sense amplifier, an – Low Offset Voltage: 125µV Maximum integrated voltage reference and two comparators. Two – Low Gain Error: 0.2% Maximum versions of the LT6109 are available. The LT6109-1 has n Internal 400mV Precision Reference the comparators connected in opposing polarity and the n Internal Latching Comparators with Reset LT6109-2 has the comparators connected in the same polar- – Fast Response Time: 500ns ity. In addition, the current sense amplifier and comparator – Total Threshold Error: ±1.25% Maximum inputs and outputs are directly accessible. The amplifier – Two Comparator Polarity Options gain and comparator trip points are configured by external n Wide Supply Range: 2.7V to 60V resistors. The open-drain comparator outputs allows for n Supply Current: 550µA easy interface to other system components. n Low Shutdown Current: 5µA Maximum The overall propagation delay of the LT6109 is typically n Specified for –40°C to 125°C Temperature Range only 1.4µs, allowing for quick reaction to overcurrent n Available in 10-Lead MSOP Package and undercurrent conditions. The 1MHz bandwidth al- lows the LT6109 to be used for error detection in critical applications such as motor control. The high threshold
APPLICATIONS
accuracy of the comparators, combined with the ability to n Overcurrent, Undercurrent and Fault Detection latch both comparators, ensures the LT6109 can capture n Current Shunt Measurement high speed events. n Battery Monitoring n The LT6109 is fully specified for operation from –40°C to Motor Control n 125°C, making it suitable for industrial and automotive ap- Automotive Monitoring and Control n plications. The LT6109 is available in a small 10-lead MSOP. Remote Sensing n Industrial Control L, LT, LTC, LTM, TimerBlox, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION Circuit Fault Protection with Latching Load Disconnect and Early Warning Indication Response to Overcurrent Event
0.1Ω IRF9640 12V TO LOAD VLOAD 6.2V* 1k 3.3V 100Ω 0.1µF 10V/DIV SENSEHI SENSELO 0V V+ OUTA V 10k 1.62k 100k OUT I LT6109-2 LOAD 6.04k 200mA/DIV RESET EN/RST INC2 0mA 1k 100mA WARNING VOUTC1 OUTC2 2.37k 250mA DISCONNECT 5V/DIV 0V 250mA DISCONNECT 2N2700 OUTC1 INC1 VOUTC2 100mA WARNING V– 5V/DIV 1.6k 0V 610912 TA01a 5µs/DIV 610912 TA01b *CMH25234B 610912fa 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagrams Applications Information Typical Applications Package Description Revison History Typical Application Related Parts