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Accurate current sensing is used in a wide variety of applications where the current is either regulated as part of a feedback loop – in a switched mode power supply (SMPS), for example, or a to control torque and speed in a motor driver - or controlled to detect levels that could be critical or dangerous for the system and implement appropriate over-current protections.

Very often current sensing is performed by measuring the voltage drop developed across shunt-resistors that can be connected to ground (low-side sensing) or to the supply rail (high-side sensing).

ST provides a range of solutions to help engineers implement high-efficiency and accurate current sensing applications including current-sense amplifiers, high-precision operational amplifiers and comparators.

Part Number
Description
STEVAL-LDO001V1 Quad high performance LDO evaluation board based on LDBL20, LDLN025, LD39130S and STLQ020 Quick view

Key Features

  • Multi LDO evaluation board based on four high performance low dropout linear voltage regulators in miniature packages
  • Key features:
    • Low operating input voltage (from 1.4 V to 5.5 V)
    • Current capability from 200 mA to 300 mA
    • Low dropout (down to 160 mV typ.)
    • Ultra-low quiescent current (down to 500 nA typ.)
    • Low noise (down to 6.5 μVRMS typ.)
    • High PSSR (up to 80 dB)
    • Logic controlled electronic shutdown (enable)
    • Tiny packages (DFN-6L, Flip-chip, ST STAMP™)
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
X-NUCLEO-IKA01A1 Multifunctional expansion board based on operational amplifiers for STM32 Nucleo Quick view

Key Features

  • 7 predefined configurations:
    • Instrumentation amplifier structure
    • Current sensing with or without USB
    • Photodiode/ultraviolet (UV) current sensing
    • Buffer
    • Full wave rectifier
    • Constant current LED driver
    • Window comparator
  • One prototyping area
  • Compatible with STM32 Nucleo boards
  • Comprehensive free development firmware library (X-CUBE-ANALOG1)
  • Powered through the Arduino UNO connectors
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISQ014V1 Low-side current sensing evaluation board based on the TSZ121 op amp Quick view

Key Features

  • Very high accuracy: offset voltage 5 μV max at 25 °C, 8 μV over full temperature range (-40 °C to 125 °C)
  • Rail-to-rail input and output
  • Low supply voltage: 1.8 - 5.5 V
  • Low power consumption: 40 μA max. at 5 V
  • Gain bandwidth product: 400 kHz
  • High tolerance to ESD: 4 kV HBM
  • Extended temperature range: -40 to +125 °C
  • Micro-packages: SC70-5 (TSZ121), DFN8 2x2 (TSZ122), and QFN16 3x3 (TSZ124)
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
STM32373C-EVAL Evaluation board with STM32F373VC MCU Quick view

Key Features

  • STM32F373VCT6 microcontroller
  • Four 5 V power supply options:
    • Power jack
    • ST-LINK/V2 USB connector
    • User USB connector
    • Daughter board
  • Audio jack connected to I2 S DAC
  • Microphone connected to ADC through an amplifier
  • 2-GByte (or more) MicroSD card on SPI
  • Three components on I2 C bus: temperature sensor, EEPROM and dual interface RF EEPROM
  • RS-232 communication configurable for communication of Flash loader
  • IrDA transceiver
  • 240x320 TFT color LCD connected to SPI interface
  • Joystick with 4-direction control and selector
  • Reset, Wakeup or Tamper, and Key buttons
  • 4 color user LEDs
  • 2 LEDs for MCU power range indicator
  • ECG, pressure sensor and PT100 temperature sensor connected to the 16-bit Sigma Delta ADC of STM32F373VCT6
  • Extension connectors for daughter board or wrapping board
  • MCU voltage: 3.3 V or adjustable 2.0 V - 3.6 V
  • USB FS connector
  • Touch slider
  • RTC with backup battery
  • CAN 2.0 A/B compliant connection
  • Light dependent resistor (LDR)
  • Two HDMI connectors with DDC and CEC
  • IR transmitter and receiver
  • Two ADC & DAC input and output signal connectors and one Sigma Delta ADC input signal connector
  • Potentiometer
  • JTAG/SWD and ETM trace debug support
  • Embedded ST-LINK/V2

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FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISQ013V1 Low side current sensing based on TS507 Quick view

Key Features

  • Ultra low offset voltage: 25 μV typ, 100 μV max
  • Rail-to-rail input/output voltage swing
  • Operating from 2.7 V to 5.5 V
  • High speed: 1.9 MHz
  • 45° phase margin with 100 pF
  • Low consumption: 0.8 mA at 2.7 V
  • Very large signal voltage gain: 131 dB
  • High power supply rejection ratio: 105 dB
  • Very high ESD protection 5 kV (HBM)
  • Latch-up immunity
  • RoHS compliant

Show More

IMAGE

Image
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FEATURED RESOURCES

Schematics BOM Gerber
Part Number
STEVAL-LDO001V1

Quad high performance LDO evaluation board based on LDBL20, LDLN025, LD39130S and STLQ020

Key Features

  • Multi LDO evaluation board based on four high performance low dropout linear voltage regulators in miniature packages
  • Key features:
    • Low operating input voltage (from 1.4 V to 5.5 V)
    • Current capability from 200 mA to 300 mA
    • Low dropout (down to 160 mV typ.)
    • Ultra-low quiescent current (down to 500 nA typ.)
    • Low noise (down to 6.5 μVRMS typ.)
    • High PSSR (up to 80 dB)
    • Logic controlled electronic shutdown (enable)
    • Tiny packages (DFN-6L, Flip-chip, ST STAMP™)
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
X-NUCLEO-IKA01A1

Multifunctional expansion board based on operational amplifiers for STM32 Nucleo

Key Features

  • 7 predefined configurations:
    • Instrumentation amplifier structure
    • Current sensing with or without USB
    • Photodiode/ultraviolet (UV) current sensing
    • Buffer
    • Full wave rectifier
    • Constant current LED driver
    • Window comparator
  • One prototyping area
  • Compatible with STM32 Nucleo boards
  • Comprehensive free development firmware library (X-CUBE-ANALOG1)
  • Powered through the Arduino UNO connectors
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISQ014V1

Low-side current sensing evaluation board based on the TSZ121 op amp

Key Features

  • Very high accuracy: offset voltage 5 μV max at 25 °C, 8 μV over full temperature range (-40 °C to 125 °C)
  • Rail-to-rail input and output
  • Low supply voltage: 1.8 - 5.5 V
  • Low power consumption: 40 μA max. at 5 V
  • Gain bandwidth product: 400 kHz
  • High tolerance to ESD: 4 kV HBM
  • Extended temperature range: -40 to +125 °C
  • Micro-packages: SC70-5 (TSZ121), DFN8 2x2 (TSZ122), and QFN16 3x3 (TSZ124)
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
STM32373C-EVAL

Evaluation board with STM32F373VC MCU

Key Features

  • STM32F373VCT6 microcontroller
  • Four 5 V power supply options:
    • Power jack
    • ST-LINK/V2 USB connector
    • User USB connector
    • Daughter board
  • Audio jack connected to I2 S DAC
  • Microphone connected to ADC through an amplifier
  • 2-GByte (or more) MicroSD card on SPI
  • Three components on I2 C bus: temperature sensor, EEPROM and dual interface RF EEPROM
  • RS-232 communication configurable for communication of Flash loader
  • IrDA transceiver
  • 240x320 TFT color LCD connected to SPI interface
  • Joystick with 4-direction control and selector
  • Reset, Wakeup or Tamper, and Key buttons
  • 4 color user LEDs
  • 2 LEDs for MCU power range indicator
  • ECG, pressure sensor and PT100 temperature sensor connected to the 16-bit Sigma Delta ADC of STM32F373VCT6
  • Extension connectors for daughter board or wrapping board
  • MCU voltage: 3.3 V or adjustable 2.0 V - 3.6 V
  • USB FS connector
  • Touch slider
  • RTC with backup battery
  • CAN 2.0 A/B compliant connection
  • Light dependent resistor (LDR)
  • Two HDMI connectors with DDC and CEC
  • IR transmitter and receiver
  • Two ADC & DAC input and output signal connectors and one Sigma Delta ADC input signal connector
  • Potentiometer
  • JTAG/SWD and ETM trace debug support
  • Embedded ST-LINK/V2

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISQ013V1

Low side current sensing based on TS507

Key Features

  • Ultra low offset voltage: 25 μV typ, 100 μV max
  • Rail-to-rail input/output voltage swing
  • Operating from 2.7 V to 5.5 V
  • High speed: 1.9 MHz
  • 45° phase margin with 100 pF
  • Low consumption: 0.8 mA at 2.7 V
  • Very large signal voltage gain: 131 dB
  • High power supply rejection ratio: 105 dB
  • Very high ESD protection 5 kV (HBM)
  • Latch-up immunity
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
00 Files selected for download

Technical Documentation

    • Description Version Size Action
      AN4369
      Adjustable gain with a current sensing
      2.0
      632.09 KB
      PDF
      AN4366
      Compensate the input offset of a high-side current sensing
      1.0
      280.34 KB
      PDF
      AN4835
      High-side current sensing for applications using high common-mode voltage
      1.0
      657.19 KB
      PDF
      AN4304
      How to filter the input of a high-side current sensing
      1.0
      528.94 KB
      PDF
      AN4369

      Adjustable gain with a current sensing

      AN4366

      Compensate the input offset of a high-side current sensing

      AN4835

      High-side current sensing for applications using high common-mode voltage

      AN4304

      How to filter the input of a high-side current sensing

Amplifiers and Comparators

Part number Description
CS30 High side current sense high voltage op amp
TSC101 High side current sense amplifier
TSC102 High side current sense amplifier plus signal conditioning amplifier
TSC888 Low cost high-side current sense amplifier
TSV731 High accuracy (Vio below 200uV) Micropower (60uA) 5V CMOS Op Amp, single, GBP 900kHz
TSX711 Precision (200uV), rail-to-rail 16V CMOS Op-Amp, single, GBP 2.7MHz
TSZ121 Very high accuracy (5 uV) zero drift 5 V CMOS Op-Amp, single, GBP=400kHz
Part number
High side current sense high voltage op amp
High side current sense amplifier
High side current sense amplifier plus signal conditioning amplifier
Low cost high-side current sense amplifier
High accuracy (Vio below 200uV) Micropower (60uA) 5V CMOS Op Amp, single, GBP 900kHz
Precision (200uV), rail-to-rail 16V CMOS Op-Amp, single, GBP 2.7MHz
Very high accuracy (5 uV) zero drift 5 V CMOS Op-Amp, single, GBP=400kHz