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Current Sense Amplifier

TP2121 - Nanopower 600nA, 1.8V, Rail-to-Rail Single Op-amps


 Supply Current: 950nA Maximum /Amplifier 

 Stable 18kHz GBWP with 10mV/μs Slew Rate 

 Offset Voltage: 1.5mV Maximum 

 Ultra-low VOS TC: 0.5μV/°C 

 Ultra-low Input Bias Current: 1fA Typical 

 High 120dB Open-Loop Voltage Gain 

 Unity Gain Stable for 1,000nF Capacitive Load 

 Rail-to-Rail Input/Output Voltage Range 

 Outputs Source and Sink 20mA 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 8kV – HBM and 2kV – CDM ESD Rating 

 Green, Popular Type Package 

Typical Application

The Battery Current Sensing Application


The TP212x are ultra-low power, precision CMOS op-amps featuring a maximum supply current of 800nA per amplifier with an ultra-low typical input bias current of 1fA. Analog trim and calibration routine reduce input offset voltage to below 1.5mV, and the precision temperature compensation technique makes offset voltage temperature drift at 0.5μV/°C, which allowing use of the TP212x in systems with high gain without creating excessively large output offset errors. 

The TP212x are unity gain stable with 1,000nF capacitive load with a constant 18kHz GBWP, 10mV/μs slew rate, which make them appropriate for low frequency applications, such as battery current monitoring and sensor conditioning. The TP212x can operate from a single-supply voltage of +1.8V to +6.0V or a dual-supply voltage of ±0.9V to ±3.0V. Beyond the rails input and rail-to-rail output characteristics allow the full power-supply voltage to be used for signal range. 

The combined features make the TP212x ideal choices for battery-powered applications because they minimize errors due to power supply voltage variations over the lifetime of the battery and maintain high CMRR even for a rail-to-rail input op-amp. Mobile accessories, wireless remote sensing, backup battery sensors, and single-Li+ or 2-cell NiCd/Alkaline battery powered systems can benefit from the features of the TP212x op-amps. 


 Handsets and Mobile Accessories 

 Current Sensing 

 Wireless Remote Sensors, Active RFID Readers 

 Environment/Gas/Oxygen Sensors 

 Threshold Detectors/Discriminators 

 Low Power Filters 

 Battery or Solar Powered Devices 

 Sensor Network Powered by Energy Scavenging 

Application Notes
3PEAK_Selection Guide