Features and Benefits
- Input Offset Voltage: 300µV (Max)
- Sense Inputs Up to 48V
- 0.5% Gain Accuracy
- Pin Selectable Gain: 10, 12.5, 20, 25, 40, 50V/V
- Separate Power Supply: 2.7V to 36V
- Operating Current: 60µA
- Sense Input Current (VCC Powered Down): 1nA
- Reverse Battery Protected to –48V
- Buffered Output
- Noise Filtering Input
- –40°C to 125°C Operating Temperature Range
- Available in 8-Lead DFN and MSOP Packages
The LT6100 is a complete micropower, precision, high side current sense amplifier. The LT6100 monitors unidirectional currents via the voltage across an external sense resistor. Fixed gains of 10, 12.5, 20, 25, 40, 50V/V are obtained by simply strapping or floating two gain select pins. Gain accuracy is better than 0.5% for all gains.
The LT6100 sense inputs have a voltage range that extends from 4.1V to 48V, and can withstand a differential voltage of the full supply. This makes it possible to monitor the voltage across a MOSFET switch or a fuse. The part can also withstand a reverse battery condition on the inputs.
Input offset is a low 300µV. CMRR and PSRR are in excess of 105dB, resulting in a wide dynamic range. A filter pin is provided to easily implement signal filtering with a single capacitor.
The LT6100 has a separate supply input, which operates from 2.7V to 36V and draws only 60µA. When VCC is powered down, the sense pins are biased off. This prevents loading of the monitored circuit, irrespective of the sense voltage. The LT6100 is available in an 8-lead DFN and MSOP package.
- Battery Monitoring
- Fuse Monitoring
- Portable and Cellular Phones
- Portable Test/Measurement Systems
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
DC907A-B Demo Board for:
LTC2054 Single Micropower Zero-Drift Operational Amplifiers
LTC6102 Precision Zero Drift Current Sense Amplifier
LT1787 Precision, High Side Current Sense Amplifiers
LT6100 Precision, Gain Selectable High Side Current Sense Amplifier
LTC2439-1 8-/16-Channel 16-Bit No Latency Delta Sigma ADC
DC1114A: Demo Board for the LT6100 Precision, Gain Selectable High Side Current Sense Amplifier
Documentation & Resources
R075 Reliability Data3/26/201820 K
DC907A - Demo Manual10/22/20092M
DC1114A - Demo Manual9/24/2009185K
Precision High Side Current Sense Amplifiers7/13/20171M
Current Sensing with PMBus Digital Power System Managers—Part 21/1/2022 Analog Dialogue
Finally, High Voltage Current Sensing Made Easy5/1/2005 LT Journal
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.
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Models for the following parts are available in LTspice:
LT6100 Companion Parts
Recommended Related Parts
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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.