LT6100 Datasheet

• 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 (V_CC 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

• Battery Monitoring
• Fuse Monitoring
• Portable and Cellular Phones
• Portable Test/Measurement Systems

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 V_CC 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.