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LMP8481-Q1

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AEC-Q100, 4 to 76V, bi-directional current sense amplifier

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Data sheet

LMP8481-Q1

ACTIVE
Data sheet Order now

Product details

Product type Analog output Common-mode voltage (max) (V) 76 Common-mode voltage (min) (V) 4 Input offset (±) (max) (µV) 265 Input offset drift (±) (typ) (µV/°C) 6 Voltage gain (V/V) 20, 60, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 270 Supply voltage (max) (V) 76 Supply voltage (min) (V) 4.5 Iq (max) (mA) 0.155 Number of channels 1 Comparators (#) 0 Gain error (%) 0.6 Gain error drift (±) (max) (ppm/°C) 60 Slew rate (V/µs) 1 Features Bidirectional Rating Automotive Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 76 Common-mode voltage (min) (V) 4 Input offset (±) (max) (µV) 265 Input offset drift (±) (typ) (µV/°C) 6 Voltage gain (V/V) 20, 60, 100 CMRR (min) (dB) 100 Bandwidth (kHz) 270 Supply voltage (max) (V) 76 Supply voltage (min) (V) 4.5 Iq (max) (mA) 0.155 Number of channels 1 Comparators (#) 0 Gain error (%) 0.6 Gain error drift (±) (max) (ppm/°C) 60 Slew rate (V/µs) 1 Features Bidirectional Rating Automotive Operating temperature range (°C) -40 to 125
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • Bidirectional or Unidirectional Sensing
  • Common Mode Voltage Range: 4.0 V to 76 V
  • Supply Voltage Range: 4.5 V to 76 V
  • Fixed Gains: 20, 60, and 100 V/V
  • Gain Accuracy: ±0.1%
  • Offset: ±80 µV
  • Bandwidth (–3 dB): 270 kHz
  • Quiescent Current: < 100 µA
  • Buffered High-Current Output: > 5 mA
  • Input Bias Current: 7 µA
  • PSRR (DC): 122 dB
  • CMRR (DC): 124 dB
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • Bidirectional or Unidirectional Sensing
  • Common Mode Voltage Range: 4.0 V to 76 V
  • Supply Voltage Range: 4.5 V to 76 V
  • Fixed Gains: 20, 60, and 100 V/V
  • Gain Accuracy: ±0.1%
  • Offset: ±80 µV
  • Bandwidth (–3 dB): 270 kHz
  • Quiescent Current: < 100 µA
  • Buffered High-Current Output: > 5 mA
  • Input Bias Current: 7 µA
  • PSRR (DC): 122 dB
  • CMRR (DC): 124 dB

The automotive-qualified LMP8480-Q1 and LMP8481-Q1 devices are precision, high-side, current-sense amplifiers that amplify a small differential voltage developed across a current-sense resistor in the presence of high input common-mode voltages. These amplifiers are designed for bidirectional (LMP8481-Q1) or unidirectional (LMP8480-Q1) current applications and accept input signals with a common-mode voltage range from 4 V to 76 V with a bandwidth of 270 kHz. Because the operating power-supply range overlaps the input common-mode voltage range, the LMP848x-Q1 can be powered by the same voltage that is being monitored. This benefit eliminates the need for an intermediate supply voltage to be routed to the point of load where the current is being monitored, resulting in reduced component count and board space.

The LMP848x-Q1 family consists of fixed gains of 20, 60, and 100 for applications that demand high accuracy over temperature. The low-input offset voltage allows the use of smaller sense resistors without sacrificing system error. The LMP8480-Q1 and LMP8481-Q1 are pin-for-pin replacements for the MAX4080 and MAX4081 devices, offering improved offset voltage, wider reference adjust range, and higher output drive capabilities. The LMP8480-Q1 and LMP8481-Q1 are available in an 8-pin VSSOP package.

The automotive-qualified LMP8480-Q1 and LMP8481-Q1 devices are precision, high-side, current-sense amplifiers that amplify a small differential voltage developed across a current-sense resistor in the presence of high input common-mode voltages. These amplifiers are designed for bidirectional (LMP8481-Q1) or unidirectional (LMP8480-Q1) current applications and accept input signals with a common-mode voltage range from 4 V to 76 V with a bandwidth of 270 kHz. Because the operating power-supply range overlaps the input common-mode voltage range, the LMP848x-Q1 can be powered by the same voltage that is being monitored. This benefit eliminates the need for an intermediate supply voltage to be routed to the point of load where the current is being monitored, resulting in reduced component count and board space.

The LMP848x-Q1 family consists of fixed gains of 20, 60, and 100 for applications that demand high accuracy over temperature. The low-input offset voltage allows the use of smaller sense resistors without sacrificing system error. The LMP8480-Q1 and LMP8481-Q1 are pin-for-pin replacements for the MAX4080 and MAX4081 devices, offering improved offset voltage, wider reference adjust range, and higher output drive capabilities. The LMP8480-Q1 and LMP8481-Q1 are available in an 8-pin VSSOP package.
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Technical documentation

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Type Title Date
* Data sheet LMP848x-Q1 Automotive, 76-V, High-Side, High-Speed, Current-Sense Amplifier datasheet (Rev. A) PDF | HTML 24 Feb 2017
Application brief Current Mode Control in Switching Power Supplies (Rev. E) PDF | HTML 12 Apr 2023
Application brief Low-Drift, Precision, In-Line Motor Current Measurements With PWM Rejection (Rev. D) PDF | HTML 07 Apr 2023
Application brief Switching Power Supply Current Measurements (Rev. E) PDF | HTML 07 Apr 2023
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
User guide LMP8480EVM Current Shunt Monitors Guide (Rev. A) 19 Mar 2013

Design & development

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Evaluation board

LMP848XMMEVM-X — LMP8480 and LMP8481 Evaluation Tool

The Texas Instruments LMP8480/81 evaluation module (EVM) helps designers quickly evaluate the operation and performance of the LMP8480/81 76V Precision High Side Current Sense Amplifier. The EVM is ready to connect to power, load, and test instruments through the use of on-board terminals.

The EVM (...)

User guide: PDF
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Simulation model

LMP8481 PSpice Model (Rev. B)

SNVM341B.ZIP (77 KB) - PSpice Model
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Simulation model

LMP8481 TINA-TI Reference Design (Rev. A)

SNVM349A.TSC (4029 KB) - TINA-TI Reference Design
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Simulation model

LMP8481 TINA-TI Spice Model (Rev. A)

SNVM348A.ZIP (60 KB) - TINA-TI Spice Model
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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

Products
Analog current-sense amplifiers
INA180 — 26V, 350kHz current sense amplifier INA180-Q1 — AEC-Q100, 26V, 350kHz current sense amplifier INA181 — 26-V bi-directional 350-kHz current-sense amplifier INA181-Q1 — AEC-Q100, 26V, bi-directional, 350kHz current sense amplifier INA183 — 2.7-V to 26-V, high-precision current sense amplifier with input supply INA185 — 26-V, 350-kHz, bi-directional, high-precision current sense amplifier in ultra-small SOT-563 package INA186 — 40-V, bidirectional, high-precision current sense amplifier with picoamp input bias & ENABLE INA186-Q1 — AEC-Q100, 40-V, bidirectional, high-precision current sense amplifier w/ picoamp input bias & ENABLE INA190 — 40-V, bidirectional, ultraprecise current sense amplifier with picoamp IB & ENABLE INA190-Q1 — AEC-Q100, 40V, bi-directional, ultra-precise current sense amplifier w/picoamp IB & ENABLE INA191 — 40V, ultra-precise current sense amplifier with ENABLE and picoamp IB in WCSP INA193 — -16 to 80V, 500kHz current sense amplifier INA193A-EP — Enhanced product, -16 to 80V, 500-kHz current sense amplifier INA193A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA194 — -16 to 80V, 500kHz current sense amplifier INA194A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA195 — -16 to 80V, 500kHz current sense amplifier INA195A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA196 — -16 to 80V, 500kHz current sense amplifier INA196A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA197 — -16 to 80V, 500kHz current sense amplifier INA197A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA198 — -16 to 80V, 500kHz current sense amplifier INA198A-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA199 — 26V, bi-directional current sense amplifier INA199-Q1 — AEC-Q100, 26V, bi-directional current sense amplifier INA200 — -16 to 80V, 500kHz current sense amplifier w/ comparator INA200-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator INA201 — -16 to 80V, 500kHz current sense amplifier w/ comparator INA201-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator INA202 — -16 to 80V, 500kHz current sense amplifier w/ comparator INA202-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator INA203 — -16 to 80V, 500kHz current sense amplifier w/ dual comparators INA203-Q1 — AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ dual comparators INA204 — -16 to 80V, 500kHz current sense amplifier w/ dual comparators INA205 — -16 to 80V, 500kHz current sense amplifier w/ dual comparators INA206 — -16 to 80V, 500kHz current sense amplifier w/ window comparator INA207 — -16 to 80V, 500kHz current sense amplifier w/ window comparator INA208 — -16 to 80V, 500kHz current sense amplifier w/ window comparator INA210 — 26V, bi-directional, high-precision current sense amplifier INA210-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA211 — 26V, bi-directional, high-precision current sense amplifier INA211-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA212 — 26V, bi-directional, high-precision current sense amplifier INA212-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA213 — 26V, bi-directional, high-precision current sense amplifier INA213-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA214 — 26V, bi-directional, high-precision current sense amplifier INA214-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA215 — 26V, bi-directional, high-precision current sense amplifier INA215-Q1 — AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA216 — 1.8 to 5.5V, high-precision current sense amplifier in wcsp INA2180 — 26V, dual channel, 350kHz current sense amplifier INA2180-Q1 — AEC-Q100, 26V, dual channel, 350kHz current sense amplifier INA2181 — 26V, dual channel, bi-directional, 350kHz current sense amplifier INA2181-Q1 — AEC-Q100, 26V, dual channel, bi-directional, 350kHz current sense amplifier INA2191 — 40-V, dual-channel, bidirectional, ultraprecise current sense amp w/ picoamp IB & ENABLE in wcsp INA223 — 26V, programmable-gain current sense amplifier & analog power monitor INA225 — 36V, bi-directional current sense amplifier w/ four pin-selectable gain settings INA225-Q1 — AEC-Q100, 36V, bi-directional current sense amplifier w/ four pin-selectable gain settings INA2290 — Dual-channel, 2.7-V to 120-V, 1.1-MHz, ultra-precise current sense amplifier INA240 — -4 to 80V, bidirectional, ultra-precise current sense amplifier with enhanced PWM rejection INA240-Q1 — AEC-Q100, -4 to 80V, bi-directional, ultra-precise current sense amplifier w/ enhanced pwm rejection INA241A — -5-V to 110-V bidirectional ultraprecise current sense amplifier with enhanced PWM rejection INA241A-Q1 — AEC-Q100, -4V to 110V bidirectional ultraprecise current sense amplifier with enhanced PWM rejection INA241B — -5-V to 110-V bidirectional high-precision current sense amplifier with enhanced PWM rejection INA241B-Q1 — AEC-Q100, -4V to 110V bidirectional high-precision current sense amp with enhanced PWM rejection INA270 — -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA270A-Q1 — AEC-Q100, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA271 — -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA271-HT — High temp, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA271A-Q1 — AEC-Q100, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA280 — 2.7-V to 120-V, 1.1-MHz, high-precision current sense amplifier in small (SC-70) package INA280-Q1 — AEC-Q100, 2.7-V to 120-V, 1.1-Mhz current sense amplifier in small (SC-70) package INA281 — -4-V to 110-V, 1.3-MHz, high-precision current sense amplifier INA281-Q1 — AEC-Q100, -4-V to 110-V, 1.3-MHz current sense amplifier INA282 — -14 to 80V, bi-directional current sense amplifier INA282-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA283 — -14 to 80V, bi-directional current sense amplifier INA283-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA284 — -14 to 80V, bi-directional current sense amplifier INA284-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA285 — -14 to 80V, bi-directional current sense amplifier INA285-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA286 — -14 to 80V, bi-directional current sense amplifier INA286-Q1 — AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA290 — 2.7 to 120V, 1.1MHz, ultra-precise current sense amplifier in small (SC-70) package INA290-Q1 — AEC-Q100, 2.7-V to 120-V, 1.1-MHz, ultra-precise current sense amplifier in small (SC-70) package INA293 — -4-V to 110-V, 1.3-MHz, ultra-precise current sense amplifier INA293-Q1 — AEC-Q100, -4-V to 110-V, 1.3-MHz, ultra-precise current sense amplifier INA296A — -5-V to 110-V, bidirectional, 1.1-MHz 8-V/µs ultraprecise current sense amplifier INA296A-Q1 — AEC-Q100, -5V to 110V, bidirectional, 1.1-MHz 8-V/µs ultraprecise current sense amplifier INA296B — -5-V to 110-V, bidirectional, 1.1-MHz 8-V/µs high-precision current sense amplifier INA296B-Q1 — AEC-Q100, -5V to 110V, bidirectional, 1.1-MHz 8-V/µs high-precision current sense amplifier INA300 — 36V current sense comparator INA300-Q1 — AEC-Q100, 36V current sense comparator INA301 — 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator INA301-Q1 — AEC-Q100, 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator INA302 — 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ dual comparators INA302-Q1 — AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ dual comparators INA303 — 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ window comparator INA303-Q1 — AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ window comparator INA381 — 26-V, 350-kHz current sense amplifier with integrated over-current comparator INA381-Q1 — AEC-Q100, 26-V, 350-kHz current sense amplifier with integrated overcurrent comparator INA4180 — 26V, quad channel, 350kHz current sense amplifier INA4180-Q1 — AEC-Q100, 26V, quad channel, 350kHz current sense amplifier INA4181 — 26V, quad channel, bi-directional, 350kHz current sense amplifier INA4181-Q1 — AEC-Q100, 26V, quad channel, bi-directional, 350kHz current sense amplifier INA4290 — Quad-channel, 120-V, high-voltage, high-bandwidth, unidirectional current sense amplifier INA901-SP — Radiation hardened, -15-V to 65-V, split-stage current sense amplifier with in-line filter option LMP8278Q-Q1 — AEC-Q100, -2 to 40V, split-stage current sense amplifier w/ in-line filter capability LMP8480 — 4 to 76V current sense amplifier LMP8480-Q1 — AEC-Q100, 4 to 76V current sense amplifier LMP8481 — 4 to 76V, bi-directional current sense amplifier LMP8481-Q1 — AEC-Q100, 4 to 76V, bi-directional current sense amplifier LMP8601 — -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8601-Q1 — AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8602 — -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8602-Q1 — AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8603 — -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8603-Q1 — AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8640 — -2 to 42V, 950kHz current sense amplifier LMP8640-Q1 — AEC-Q100, -2 to 42V, 950kHz current sense amplifier LMP8640HV — -2 to 76V, 950kHz current sense amplifier INA310A — -4-V to 110-V, 1.3-MHz, ultra-precise current-sense amplifier with comparator INA310A-Q1 — AEC-Q100 -4-V to 110-V 1.3-MHz ultra-precise current-sense amplifier with comparator and reference INA310B — -4-V to 110-V 1.3-MHz high-precision current-sense amplifier with comparator INA310B-Q1 — AEC-Q100 -4-V to 110-V 1.3-MHz high precision current-sense amplifier with comparator and reference INA185-Q1 — AEC-Q100, 26-V, 350-kHz, bi-directional, high-precision current sense amplifier
Digital power monitors
INA209 — 26V, 12-bit, i2c output current/voltage/power monitor w/ analog comparator INA219 — 26-V 12-bit I2C output digital power monitor INA220 — 26V, 12-bit, i2c output current/voltage/power monitor INA220-Q1 — AEC-Q100, 26V, 12-bit, i2c output current/voltage/power monitor INA226 — 36V, 16-bit, ultra-precise i2c output current/voltage/power monitor w/alert INA226-Q1 — AEC-Q100, 36V, 16-bit, ultra-precise, i2c output current/voltage/power monitor w/alert INA228 — 85-V, 20-bit, ultra-precise, I2C output current/voltage/power/energy/charge monitor with alert INA228-Q1 — AEC-Q100, 85-V, 20-bit, ultraprecise, I²C output current/voltage/power/energy/charge monitor INA229 — 85-V, 20-bit, ultra-precise, SPI output current/voltage/power/energy/charge monitor with alert INA229-Q1 — AEC-Q100, 85-V, 20-bit, ultraprecise, SPI output current/voltage/power/energy/charge monitor INA230 — 36-V, 16-bit, I²C output current, voltage and power monitor with alert INA231 — 28V, 16-bit, i2c output current/voltage/power monitor w/alert in wcsp INA233 — 36V, 16-bit, ultra-precise i2c & pmbus output current/voltage/power/energy monitor w/alert INA234 — 28-V, 12-bit, I²C output current/voltage/power monitor with alert in WCSP INA236 — 48-V, 16-bit ultraprecise I²C output digital power monitor with alert in WCSP INA237 — 85-V, 16-bit, I2C output current/voltage/power monitor with alert INA237-Q1 — AEC-Q100, 85-V, 16-bit, I²C output current/voltage/charge monitor INA238 — 85-V, 16-bit, high-precision I2C output current/voltage/power monitor with alert INA238-Q1 — AEC-Q100, 85-V, 16-bit, high-precision, I²C output current/voltage/charge monitor INA239 — 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor with alert INA239-Q1 — AEC-Q100, 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor INA3221 — 26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts INA3221-Q1 — AEC-Q100, 26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts LMP92064 — 2V, 12-bit, fast simultaneous sampling SPI output current/voltage monitor INA232 — 48-V, 16-bit high-precision I²C output digital power monitor with alert
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Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

This bidirectional current sensing solution uses a current-sense amplifier and a high-speed dual comparator with a rail-to-rail input common mode range to create over-current (OC) alert signals at the comparator outputs (OUTA and OUTB) if the input current (IG1) rises above 100 A or falls below (...)
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Design tool

CIRCUIT060037 — Precision over-current latch circuit

This high-side, current sensing solution uses a current sense amplifier, a comparator with an integrated reference and a P-channel MOSFET to create an over-current latch circuit. When a load current greater than 200 mA is detected, the circuit disconnects the system from its power source. The (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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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TINA-TI — SPICE-based analog simulation program

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

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

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 (...)

Design guide: PDF
Schematic: PDF
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