LMP8278Q-Q1

ACTIVE

AEC-Q100, -2 to 40V, split-stage current sense amplifier w/ in-line filter capability

Product details

Product type Analog output Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -2 Input offset (±) (max) (µV) 2000 Input offset drift (±) (typ) (µV/°C) 2.5 Features Low-side Capable Rating Automotive Voltage gain (V/V) 14 CMRR (min) (dB) 80 Bandwidth (kHz) 90 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 4.5 Iq (max) (mA) 0.55 Number of channels 1 Comparators (#) 0 Gain error (%) 1 Gain error drift (±) (max) (ppm/°C) 25 Slew rate (V/µs) 0.7 Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 40 Common-mode voltage (min) (V) -2 Input offset (±) (max) (µV) 2000 Input offset drift (±) (typ) (µV/°C) 2.5 Features Low-side Capable Rating Automotive Voltage gain (V/V) 14 CMRR (min) (dB) 80 Bandwidth (kHz) 90 Supply voltage (max) (V) 5.5 Supply voltage (min) (V) 4.5 Iq (max) (mA) 0.55 Number of channels 1 Comparators (#) 0 Gain error (%) 1 Gain error drift (±) (max) (ppm/°C) 25 Slew rate (V/µs) 0.7 Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • TCVos ±15μV/°C Max
  • CMRR 80 dB Min
  • Input Offset Voltage ±2 mV max
  • CMVR −2V to 40V
  • Operating Ambient Temperature Range −40°C to 125°C
  • Single Supply Operation
  • Min / Max Limits 100% Tested unless Otherwise Noted
  • LMP8278Q Available in Automotive AEC-Q100 Grade 1 Qualified Version

All trademarks are the property of their respective owners.

  • TCVos ±15μV/°C Max
  • CMRR 80 dB Min
  • Input Offset Voltage ±2 mV max
  • CMVR −2V to 40V
  • Operating Ambient Temperature Range −40°C to 125°C
  • Single Supply Operation
  • Min / Max Limits 100% Tested unless Otherwise Noted
  • LMP8278Q Available in Automotive AEC-Q100 Grade 1 Qualified Version

All trademarks are the property of their respective owners.

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.

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.

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INA186 ACTIVE 40-V, bidirectional, high-precision current sense amplifier with picoamp input bias & ENABLE This product offers better VOS, Gain Error, and temperature drift parameters.
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Technical documentation

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Type Title Date
* Data sheet LMP8278Q High Mode, 14 x Gain, Precision Sensing Amplifier datasheet (Rev. A) 22 Mar 2013
Application note Risks and Prevention of ESD, EOS, and Latch Up Events for Current Sense Amplifiers PDF | HTML 18 Nov 2024
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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMP8278MMEVAL — LMP8278MM Evaluation Board

The LMP8278Q Evaluation Board is designed to evaluate the LMP8278Q current sense amplifier.

User guide: PDF
Not available on TI.com
Simulation model

LMP8278Q PSpice Model

SNAM034.ZIP (16 KB) - PSpice Model
Calculation tool

CS-AMPLIFIER-ERROR-TOOL Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
Supported products & hardware

Supported products & hardware

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Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

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Design tool

CIRCUIT060037 — Precision over-current latch circuit

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Simulation tool

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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

TIDA-00302 — Current Shunt Monitor with Transient Robustness Reference Design

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Design guide: PDF
Schematic: PDF
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VSSOP (DGK) 8 Ultra Librarian

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