LMP8278Q-Q1

ACTIVE

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

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Product details

Parameters

Common mode voltage (Max) (V) 40 Common mode voltage (Min) (V) -2 Input offset (+/-) (Max) (uV) 2000 Input offset drift (+/-) (Typ) (uV/C) 2.5 Gain (V/V) 14 Gain error (%) 1 Gain error drift (+/-) (Max) (ppm/°C) 25 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 Features Low-side Capable Rating Automotive Operating temperature range (C) -40 to 125 open-in-new Find other Current sense amplifiers analog output

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other Current sense amplifiers analog output

Features

  • 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

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Description

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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Technical documentation

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Type Title Date
* Datasheet LMP8278Q High Mode, 14 x Gain, Precision Sensing Amplifier datasheet (Rev. A) Mar. 22, 2013
Technical articles How current-sense amplifiers monitor satellite health Feb. 08, 2021
Application note High-Side Drive, High-Side Solenoid Monitor With PWM Rejection (Rev. C) Dec. 04, 2020
E-book Simplifying Current Sensing (Rev. A) Jan. 09, 2020
Technical articles A key to accurate system thermal management: monitoring both current flow and temperature Oct. 04, 2018
Technical articles System trade-offs for high- and low-side current measurements Jun. 01, 2017
Technical articles Why should you care about overcurrent protection in your system? Jun. 16, 2016
User guide AN-2223 LMP8278Q MSOP Evaluation Board User’s Manual (Rev. A) Apr. 26, 2013

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description

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

Features
  • High Common Mode to +40V
  • Fixed Gain of 14
  • Single Supply Operation

Design tools & simulation

SIMULATION MODEL Download
SNAM034.ZIP (16 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SIMULATION TOOL Download
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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Reference designs

REFERENCE DESIGNS Download
Current Shunt Monitor with Transient Robustness Reference Design
TIDA-00302 This high-side current shunt monitor is used to measure the voltage developed across a current-sensing resistor when current passes through it.

Additionally, an external protection circuit is implemented to provide surge and fast-transient protection and demonstrate the different immunity levels to (...)

document-generic Schematic document-generic User guide
Design files

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options

Ordering & quality

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