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Current Sense Amplifier

TP2111 - Nanopower 300nA, 1.8V, Rail-to-Rail Single Op-amps


 Ultra-low Supply Current: 300nA Typical / 500nA Maximum per Amplifier

 Stable 10 kHz GBWP with 6 mV/μs Slew Rate 

 Offset Voltage: 1.5 mV Maximum 

 Ultra-low Vos TC: 0.4 μV/°C 

 Ultra-low Input Bias Current: 0.1 fA Typical 

 Unity Gain Stable for 1,000 nF Capacitive Load 

 High 120 dB Open-Loop Voltage Gain 

 Ground-Sensing Input Common-Mode Range 

 Outputs Swing Rail-to-Rail 

 Outputs Source and Sink 20 mA of Load Current 

 No Phase Reversal for Overdriven Inputs 

 Ultra-low Single-Supply Operation Down to +1.8V 

 –40°C to 125°C Operation Range 

 Robust 8 kV – HBM and 2 kV – CDM ESD Rating 

 Green, Popular Type Package

Typical Application

The TP211x in Low Side Battery Current Sensor 


The TP2111 is ultra-low power, precision CMOS op-amp that provides a constant 10kHz bandwidth and 10mV/μs slew rate with only 300nA quiescent current per amplifier. The ground-sensing input common-mode range, guaranteed 1.5mV  Vos and ultra-low 0.4μV/°C  Vos TC enables accurate and stable measurement for both high side and low side current sensing. 

The TP2111 has carefully designed CMOS input stage that outperforms competitors with typically 0.1fA IB. This ultra-low input current significantly reduces IB and IOS errors introduced in giga-Ω resistance, high impedance photodiode, and charge sense situations. The TP2111 is unity gain stable with 1,000nF capacitive load. They can operate from a single -supply voltage of +1.8V to +6.0V or a dual-supply voltage of ±0.9V to ±3.0V, and features ground-sensing inputs and rail-to-rail output. 

The combined features make the TP2111 ideally suited for a variety of 2-cell NiCd/Alkaline battery or single-Li+ battery powered portable applications. Potential applications include low frequency signal conditioning, mobile accessories, wireless remote sensing, vibration monitors, ECGs, pulse monitors, glucose meters, smoke and fire detectors, and backup battery sensors. 


 Current Sensing 

 Threshold Detectors/Discriminators 

 Low Power Filters 

 Handsets and Mobile Accessories 

 Wireless Remote Sensors, Active RFID Readers 

 Gas/Oxygen/Environment Sensors 

 Battery or Solar Powered Devices 

 Sensor Network Powered by Energy Scavenging

Application Notes
3PEAK_Selection Guide