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Precision current sense amplifier packs performance into small package

Milpitas, Calif. — Linear Technology has introduced a precision current sense amplifier with an input common mode range that extends from -0.3 V below V- up to 44 V above V-. The common mode range of the LT6105 is independent of the positive supply voltage, making it suitable for a wide range of applications, and enabling the device to operate as a high-side or a low-side current sense monitor.

The LT6105 can continuously monitor current during a load short or power supply failure, as well as continuously monitor a battery from full charge to depletion. The LT6105 can directly monitor the current on a negative supply voltage and because the inputs of device can withstand differential voltages up to +/-44 V it's well-suited for monitoring loads connected through a fuse or a MOSFET switch.

The LT6105 is said to offer excellent precision with only 300 uV of input offset voltage and only 0.5 uV/°C of input offset drift. Any gain between 1 to 100 V/V can be designed with external resistors and gain error is limited to less than 1% maximum, said Linear. The LT6105 operates with an independent supply voltage of 2.85 V to 36 V and draws only 150 uA. When powered down, the sense pins are biased off, which prevents any loading of the sense resistor, irrespective of the sense voltage. The device is offered in 2 x 3-mm DFN and 8-lead MSOP packages.

Pricing: The LT6105 is in full production, with prices starting at $0.99 each in quantities of 1,000.
Datasheet: LT6105

Linear Technology Corp. , 1-408-432-1900, www.linear.com

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