Milpitas, Calif. Linear Technology Corp.'s current- sense amplifier is said to provide a complete precision part with a lot of flexibility.
Simply connect a high-side shunt to the inputs; the high-side current sense amp extracts and then amplifies the differential signal and provides a ground-referenced output signal.
Using internal resistors, the amplifier can be configured for one of six gain settings (10, 12.5, 20, 25, 40, 50 V/V) with a gain accuracy of 0.5 percent. A buffered output allows the part to be directly loaded by other circuitry.
The amplifier has robust differential inputs with a very low 300 μV offset and can accept fully differential voltages up to the supply. This capability allows the part to monitor a fuse or MOSFET directly without damaging the part. It also ensures that the part can withstand a -48 V reverse battery condition.
The device uses Linear's Over-The-Top architecture with a separate voltage supply that operates from 2.7 V to 36 V and draws only 60 μA. When powered down, the sense pins are high impedance. This prevents loading of the shunt, irrespective of the sense voltage, making this part suited for battery-powered devices, according to the company.
The LT6100 is available now in 8-Lead DFN and MSOP packages with prices starting at $1.18 each in 1,000-piece quantities. Click here for the LT6100 data sheet.
Linear Technology, 1-800-454-6327, www.Linear.com.