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The LMP8278 is a fixed 14x gain precision current sense amplifier. The part amplifies and filters small differential signals in the presence of high common mode voltages. The part operates from a single 5V supply voltage. With an input common mode voltage range from -2V to +28V the gain is very precise (±0.5%). The part can handle common mode voltages in the range -2V to +40V with relaxed specifications. The LMP8278 is a member of the Linear Monolithic Precision (LMP) family and is ideal for unidirectional current sensing applications. The parameter values that are shown in the Electrical Characteristics table are 100% tested and all bold values are also 100% tested over temperature, unless otherwise noted.
The part has a precise gain of 14x which is adequate in most targeted applications to drive an ADC to its full scale value. The fixed gain is achieved in two separate stages, a preamplifier with a gain of 7x and an output stage buffer amplifier with a gain of 2x. The connection between the two stages of the signal path is brought out on two pins to enable the possibility to create an additional filter network around the output buffer amplifier. These pins can also be used for alternative configurations with different gain as described in .
The LMP8278Q incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC Q100 standard.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LMP8278Q High Mode, 14 x Gain, Precision Sensing Amplifier datasheet (Rev. A) | 22 Mar 2013 | |
| E-book | An Engineer's Guide to Current Sensing (Rev. B) | 12 Apr 2022 | ||
| Application note | Using a PCB Copper Trace as a Current-Sense Shunt Resistor | PDF | HTML | 25 Jan 2022 | |
| EVM User's guide | AN-2223 LMP8278Q MSOP Evaluation Board User’s Manual (Rev. A) | 26 Apr 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
The LMP8278Q Evaluation Board is designed to evaluate the LMP8278Q current sense amplifier.
Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
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Added INA185-Q1 and corrected INA310B