Current Sensing Amplifiers

Current sensing amplifiers measure current by outputting a voltage that is proportional to the flowing power current. A resistor is used to convert the load current to a small voltage which is then accurately amplified. They offer real-time overcurrent protection.


What are the different applications of current sensing amplifiers?


Accurate current sensing is crucial to optimising performance in a range of applications, such as motor control and power management. In devices where battery or power-line monitoring is highly necessary, like laptops and phones, current sensing amplifiers are critical. 


How to choose the right type of current sensing amplifier


There are several factors that will determine the the type of amplifier you choose, including whether the measurement will be on the high or low side. The sense resistor can be placed either between the supply voltage and load, or between the load and ground. The former is called high-side seinsing, whereas the latter is called low-side sensing. High voltage current sensing amplifiers offer input ranges up to +76V and down to -20V, ideal for applications such as motor control and network routers. Low power current sensing amplifiers help to maximise and extend battery life. 


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Description Price Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Minimum CMRR Number of Channels per Chip Output Type Maximum Supply Current Mounting Type Package Type Pin Count Dimensions Height Length Maximum Operating Supply Voltage
RS Stock No. 901-3976
Mfr. Part No.Si8920BC-IP
HK$27.425
Each (In a Pack of 2)
units
Single 3 → 5.5 V - - 2 Differential 5.5 mA Through Hole DIP 8 9.9 x 6.6 x 3.44mm 3.44mm 9.9mm 5.5 V
RS Stock No. 160-1727
Mfr. Part No.AD8219BRMZ
HK$14.978
Each (In a Tube of 50)
units
Single -0.3 → 85 V - 94dB 1 Unidirectional 130 Bias μA Surface Mount MSOP 8 3.2 x 3.2 x 0.95mm 0.95mm 3.2mm 80 V
New
RS Stock No. 186-1444
Mfr. Part No.NCS211RMUTAG
HK$7.483
Each (In a Pack of 10)
units
Single 2.2 → 26 V - 105dB 1 Rail to Rail 60 μA Surface Mount UQFN 10 1.4 x 1.8 x 0.55mm 0.55mm 1.4mm 26 V
RS Stock No. 168-4960
Mfr. Part No.INA301A1IDGKT
HK$20.36
Each (On a Reel of 250)
units
Single 5 V - 100dB 2 Analogue, Open Drain 700 μA Surface Mount VSSOP 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm 5.5 V
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