Dual 60V Current Sense Amplifiers Feature Fast Response, Precision & Flexibility

Jan 31 2007 -MILPITAS, CA
  • Linear Technology's LTC6103 contains two independent, high side current sense amplifiers with exceptional precision and response time. As a dual, the LTC6103 is ideal for multiple current sensing applications such as H-bridge driver circuits. The unique topology also allows the second amplifier to be used for bi-directional operation, high/low current ranging or high voltage level translation.

    The LTC6103 features outstanding performance: input bias current is 170nA Max and the maximum input offset voltage is 450µV. This precision performance allows the part to resolve very small currents and still operate over a large dynamic range. The LTC6103 can withstand voltages up to 70V, a valuable feature when power supply failures or catastrophic load changes can lead to voltage fly back conditions. With a response time of 1usec, the LTC6103 is ideal for automatic power shutdown when sensing fault conditions. Gain for each device is set by two resistors and since the gain resistors are the primary determinants of accuracy, precision resistors allow for accuracy better than 1%.

    "The LTC6103 builds on our existing family of precision, fast and flexible current sense devices," says Mike Kultgen, Design Manager for Linear Technology. "Having a second integrated current sense amplifier increases the usefulness of this part by much more than a factor of two."

    LTC6103 is in full production, with prices starting at $1.66 each in 1,000-piece quantities.

    Summary of Features: LTC6103

    • Dual, Independent High Side Current Sense Amplifiers
    • 1us Response Time (to 2.5V on a 5V Output Step)
    • Operates from 4V to 60V, 70V ABS MAX
    • Low Offset Voltage: 450uV (Max)
    • Low Input Bias Current: 170nA Max
    • Each Amplifier Gain Configurable with 2 Resistors
    • Max Output Current: 1mA
    • 110dB Min PSRR
    • 275uA Typical Supply Current per Amplifier
    • –40°C to 125°C Operating Temperature Range
    • MSOP8 Package

    Dual 60V High Side Current Sense Amplifiers

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