Ultra low current op amp for battery designs, automotive
Rohm has developed a linear operational amplifier (op amp) with the lowest current consumption in the industry.
The current consumption of 160nA for the Rohm LMR1901YG-M op amp is suitable for amplifying sensor signals used to detect and measure temperature, flow rate, gas concentration, and battery powered designs as well as automotive cabin designs.
In recent years, advanced control has been in increasing demand for various applications in consumer and industrial electronics. Therefore, there is an increasing need for accurate sensing of parameters relevant to the application – such as, temperature, humidity, vibration, pressure, and flow rate.
Op amps are a crucial component in the signal chain, greatly affecting both accuracy and power consumption. By further refining the circuit design based on original Nano Energy technology, ROHM is now able to offer an op amp that delivers the lowest current consumption on the market.
The LMR1901YG-M leverages original ultra-low power technology that thoroughly suppresses current increase caused by temperature and voltage changes to reduce current consumption to a typical value of 160nA. This is approximately 38% lower than that of general low power op amps.
This not only extends the life of applications powered by internal batteries like electronic shelf labels, but also contributes to longer operating times for smartphones and other devices equipped with rechargeable batteries.
The current consumption also does not change over the temperature range of -40°C to +105°C – allowing stable low-power operation, even in environments where external temperatures fluctuate, including fire alarms and environmental sensors.
Other performance enhancements include 45% reduction of input offset voltage to just 0.55mV (Max. Ta=25°C) over general low-current op amps while a maximum input offset voltage temperature drift of 7V/°C is guaranteed. This enables high accuracy amplification of sensor signals.
The op amp is capable of operating from 1.7V to 5.5V supply voltage and offering rail-to-rail input/output and also complies with the automotive reliability standard AEC-Q100 for stable operation even under harsh conditions such as vehicle cabins.
In addition to various technical documents necessary for circuit design and SPICE models for simulation, the LMR1901YG-M can be used with Rohm Solution Simulator to speed up time to market.
Going forward, Rohm says it will continue to pursue further power savings in op amps using its proprietary ultra-low power technology and improve the performance by reducing noise and offset which will also boost the power savings and expand the power supply voltage range.
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