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Title (LC)

STMicroelectronics Current Sense Amplifiers

Amplifying Excellence with Unmatched Precision

Introduction (MM)

In the ever-evolving landscape of modern electronics, the demand for efficient power management and accurate current monitoring has never been greater. As circuits become more complex and power-hungry, the need for precise current sensing solutions has become crucial. Current Sense Amplifiers (CSAs) have emerged as a vital component in addressing this demand, offering engineers a versatile and reliable means to monitor current flow in their designs.

This page is dedicated to exploring the world of STMicroelectronics Current Sense Amplifier ICs and why they are the ideal solution for current sensing applications. Whether you are designing a power-efficient mobile device, an advanced motor control system, or a cutting-edge factory automation solution, understanding the benefits of current sense amplifiers can make all the difference in optimizing your project's efficiency, safety, and reliability. In this digital space, we will dive into the fundamental principles of current sensing, showcase the latest CSA ICs available from STMicroelectronics, and clarify why these devices are gaining increasing recognition as an indispensable tool for engineers and developers alike.

Stay with us on this journey to explore how STMicroelectronics Current Sense Amplifiers can help you revolutionize the way you monitor current in your electronic systems, ultimately enhancing your product's performance and contributing to a greener, more sustainable future.

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Benefits of CSA's

How do they work?

CSA Products and additional information

Applications list

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Calculator tool (RRCD)

Current Sense Amplifier Calculator

See our sense resistor / current shunt + current sense amplifier calculator. Enter a shunt, gain or ADC dynamic value to get output, max currents and shunt power values.

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Other text (LC)

What are the main benefits of a current sense amplifier?

Current sense amplifiers provide several benefits for designers, including the possibility to:

Measure current ranging from a few milli amperes to several hundred
Perform real-time current measurement in several topologies
Precisely measure current, thanks to an integrated matched resistive gain network
Reduce PCB size thanks to integrated gain resistance
Sustain extended input common mode voltage, far beyond the power supply rail

How does a current sense amplifier work?

The working principle of a current sensing amplifier is based on Ohm's law. When load current flows through a shunt resistor (Rshunt) present on inputs, it generates a voltage drop called V_SENSE. This voltage is generally small to limit power dissipation losses.

V_SENSE is then amplified with an internal instrumentation amplifier. The resulting output voltage (V_OUT) is a voltage which is proportional to the Ioad current. It can then be processed with an ADC (analog-to-digital converter).

High-side current sensing

The current is measured between the supply rail and the load. The DC voltage applied on the input pins can be much higher than the power supply.

Current Sensing Amplifier Diagram

Current Sense Amplifier Block Diagram Example

Benefits

Short-to-ground fault detection
High immunity against ground disturbance
Current monitored directly from the source

Challenges

High-input common-mode voltages
Support fast variation of input common-mode voltage

Low-side current sensing

The current is measured between the load and the ground. The voltage applied on the input pins is close to the ground.

Benefits

Simple implementation
Cost-effective solution
VICM (input common-mode voltage) close to GND (zero-voltage point)

Challenges

Difficult to detect short-cut to ground
Multiple output power supply (all current are combined in GND line)
May disturb the ground voltage seen by the load

Current Sense Amplifier products and additional information

Part	Supply Voltage Range	High/Low Side Current Measurement	Common-Mode Input Voltage Range	Gain	Bidirectional Current Sensing	Bandwidth (Max)	Output Type	Automotive Grade	Industrial Grade	Package	EV Boards
TSC101	4 - 24 V	High-side	2.8 to 30 V	20, 50, 100	NO	33kHz	Analog	YES	YES	SOT23-5L	STEVAL-ISQ007V1
TSC102	3.5 - 5.5 V	High-side	2.8 to 30 V	20	NO	40kHz	Analog	YES	YES	SO-8, TSSOP-8L	STEVAL-ISQ010V1
TSC1021	3.5 - 5.5 V	High-side	2.8 to 30 V	20, 50	NO	40kHz	Analog	YES	YES	TSSOP-8L	-
TSC103	2.7 - 5.5 V	High-side	2.9 to 70 V	100	NO	7kHz	Analog	YES	YES	SO-8, TSSOP-8L	-
TSC1641	2.7 - 3.6 V	High+low-side	0 to 60 V	20	YES	3.9kHz	Digital	NO	YES	VDFPN-10	STEVAL-DIGAFEV1
TSC200	2.7 - 18 V	High+low-side	- 16 to 80 V	20	NO	50kHz	Analog	YES	YES	MiniSO-8, SO-8	-
TSC2010	2.7 - 5.5 V	High+low-side	-20 to 70 V	20	YES	37kHz	Analog	YES	YES	MiniSO-8, SO-8	STEVAL-AETKT1V2
TSC2011	2.7 - 5.5 V	High+low-side	-20 to 70 V	60	YES	10kHz	Analog	YES	YES	MiniSO-8, SO-8	STEVAL-AETKT1V2
TSC2012	2.7 - 5.5 V	High+low-side	-20 to 70 V	100	YES	4kHz	Analog	YES	YES	MiniSO-8, SO-8	STEVAL-AETKT1V2
TSC2020	2.7 - 5.5 V	High+low-side	-4 to 100 V	20	YES	37kHz	Analog	YES	YES	MiniSO-8, SO-8	-
TSC210	2.7 - 26 V	High+low-side	-0.3 to 26 V	20 to 100	YES	100kHz	Analog	YES	YES	QFN10; SC70-6	STEVAL-AETKT1V1
TSZ121	1.8 - 5.5 V	Low-side	Rail to rail	Adjustable	NO	20kHz	Analog	YES	YES	SC70-5, SOT23-5	STEVAL-ISQ014V1
TSZ151	1.8 - 5.5 V	Low-side	Rail to rail	Adjustable	NO	80kHz	Analog	YES	YES	SC70-5, SOT23-5	-
TSZ181	2.2 - 5.5 V	Low-side	Rail to rail	Adjustable	NO	150kHz	Analog	YES	YES	SOT23-5, DFN6	-
TSX711	2.7 - 16 V	Low-side	Rail to rail	Adjustable	NO	135kHz	Analog	YES	YES	SOT23-5	-
TSB711A	2.7 - 36 V	Low-side	Rail to rail	Adjustable	NO	300kHz	Analog	YES	YES	SOT23-5	-
TSV771	2.0 - 5.5 V	Low-side	Rail to rail	Adjustable	NO	1MHz	Analog	YES	YES	SOT23-5	-
TSV791	2.2 - 5.5 V	Low-side	Rail to rail	Adjustable	NO	2.5MHz	Analog	YES	YES	SOT23-5	STEVAL-CCA058V1
TSB182	4.0 - 36 V	Low-side	Rail to rail	Adjustable	NO	150kHz	Analog	YES	YES	MiniSO-8, SO-8	-

Applications list

App List	Details	High Side Current Sensing	Low Side Current Sensing
Industrial robotics	Power actuators - high power MPUs - Process control, high/low side current measurement, digital power monitoring	TSC2010; TSC200; TSC2020; TSC1641	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Industrial IoT	24V bus fail safe: low power MCUs - sensing, high side current measurement, digital power monitoring	TSC2010; TSC200; TSC2020; TSC1641	-
Industrial automation - servo drives	24/48V DC power: HMI, high/low side current measurement	TSC2010; TSC200; TSC2020;	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Industrial automation - servo drives	24/48V DC power: power control, high/low side current measurement	TSC2010; TSC200; TSC2020;	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Industrial automation - PLC	24/48V systems, high side current measurement	TSC2010; TSC200; TSC2020;	-
Telecom	48V battery systems, high side current measurement, digital power monitoring	TSC2010; TSC200; TSC2020; TSC1641	-
Power tools	24/36V battery pack, high side current measurement, digital power monitoring	TSC2010; TSC200; TSC1641	-
Drones/rovers	24/36V battery pack, high side current measurement, digital power monitoring	TSC2010; TSC200; TSC1641	-
Drones/rovers	48V battery pack, high side current measurement, digital power monitoring	TSC2010; TSC200; TSC1641; TSC2020;	-
Uninterruptible power source (UPS)	12/24/36 battery pack, high/low side current measurement, digital power monitoring	TSC2010; TSC200; TSC210; TSC1641	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Uninterruptible power source (UPS)	48V battery pack, high/low side current measurement, digital power monitoring	TSC2010; TSC200; TSC2020; TSC1641	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Solar inverters	48V string input, high/low side current measurement, digital power monitoring	TSC2010; TSC200; TSC2020; TSC1641	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Automotive	24V battery (truck - agriculture machines - forklift), high/low side current measurement	TSC2010; TSC200; TSC2020	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Smart metering	Rechargeable or primary battery current measurement	TSC210; TSC1641	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Wireless charger	Coil induction measurement	TSC210	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Hydrogen cells	Utility vehicle or smart grid storage	TSC2010; TSC200; TSC2020	-
Light e-mobility	24/36V/48V battery pack, high/low side current measurement	TSC2010; TSC200; TSC2020	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791
Pool robots, robotic lawn mowers, warehouse robots, AGVs	-	TSC2010; TSC200; TSC2020	TSZ151; TSZ121; TSZ181; TSX711; TSB711A; TSB182; TSV771; TSV791

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