LT6100

LT6100 Precision, Gain Selectable High Side Current Sense Amplifier DESCRIPTIO The LT®6100 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. FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ U APPLICATIO S ■ ■ ■ ■ 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 t...