LT6109 Current Sense Amplifier

High side, current sense amplifier from Linear Technology

Image of Linear Technology's LT6109 Current Sense AmplifierThe Linear Technology LT®6109 is a complete high side current sense device. The LT6109 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. External resistors configure the amplifier gain and comparator trip points. The open-drain comparator outputs allows for easy interface to other system components.

The overall propagation delay of the LT6109 is typically only 1.4 μs, allowing for quick reaction to overcurrent and undercurrent conditions. The 1 MHz bandwidth allows the LT6109 to detect errors 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.

Features
  • Current sense amplifier
    • Fast step response: 500 ns
    • Low offset voltage: 125 μV max
    • Low gain error: 0.2% max
  • Internal 400 mV precision reference
  • Wide supply range: 2.7 V to 60 V
  • Supply current: 550 μA
  • Internal latching comparators with reset
    • Fast response time: 500 ns
    • Total threshold error: ±1.25% max
    • Two comparator polarity options
  • Low shutdown current: 5 μA max
  • Specified for -40°C to 125°C temperature range
  • Available in 10-lead MSOP package

High Side Current Sense Amplifiers

ImageManufacturer Part NumberDescriptionTypeApplicationsAvailable Quantity
LT6109HMS-1#PBF datasheet linkIC AMP CURRENT SENSE 10-MSOPLT6109HMS-1#PBFIC AMP CURRENT SENSE 10-MSOPAmplifier, Comparator, ReferenceCurrent Sensing, Power Management186 - Immediate
LT6109HMS-1#PBF product page link
LT6109HMS-2#PBF datasheet linkIC AMP CURRENT SENSE 10-MSOPLT6109HMS-2#PBFIC AMP CURRENT SENSE 10-MSOPAmplifier, Comparator, ReferenceCurrent Sensing, Power Management109 - Immediate
LT6109HMS-2#PBF product page link
LT6109AIMS-1#PBF datasheet linkIC AMP CURRENT SENSE 10-MSOPLT6109AIMS-1#PBFIC AMP CURRENT SENSE 10-MSOPAmplifier, Comparator, ReferenceCurrent Sensing, Power Management317 - Immediate
LT6109AIMS-1#PBF product page link
LT6109AHMS-2#PBF datasheet linkIC AMP CURRENT SENSE 10-MSOPLT6109AHMS-2#PBFIC AMP CURRENT SENSE 10-MSOPAmplifier, Comparator, ReferenceCurrent Sensing, Power Management263 - Immediate
LT6109AHMS-2#PBF product page link
LT6109AIMS-2#PBF datasheet linkIC AMP CURRENT SENSE 10-MSOPLT6109AIMS-2#PBFIC AMP CURRENT SENSE 10-MSOPAmplifier, Comparator, ReferenceCurrent Sensing, Power Management35 - Immediate
LT6109AIMS-2#PBF product page link
LT6109AHMS-1#PBF datasheet linkIC AMP CURRENT SENSE 10-MSOPLT6109AHMS-1#PBFIC AMP CURRENT SENSE 10-MSOPAmplifierCurrent Sensing, Power Management44 - Immediate
LT6109AHMS-1#PBF product page link
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Published: 2013-01-30