Which type of resistor is more suitable for low-power applications

In low-power applications, selecting appropriate resistors is crucial as they need to minimize power loss and thermal effects while maintaining accurate measurements. Here are some types of resistors suitable for low-power applications:

Low resistance current sensing resistors: These resistors typically have very low resistance values (such as 0.2 milliohms to 20 milliohms) to reduce power loss. Low resistance helps to reduce voltage drop in the circuit, thereby reducing power loss, while still providing sufficient voltage signal for current measurement.

Integrated current sensing resistor: The integrated current sensing resistor combines the current sensing resistor with the current detection amplifier, reducing the need for external components and lowering power consumption and costs. For example, the INA250 integrates a 2m Ω current sensing resistor, which can achieve a maximum tolerance of 0.1% and a temperature drift of 15ppm/° C in the temperature range of -40 ° C to+125 ° C.

Low power consumption influenza test amplifiers: These amplifiers are designed specifically for low-power applications, capable of operating at low power supply voltages and having low static current. For example, INA186 is a low-power voltage output current sensing amplifier suitable for devices such as smartphones and laptops.

Miniaturized resistors: In space limited applications, miniaturized surface mount resistors or integrated resistors can effectively reduce PCB footprint while maintaining low power consumption.

When selecting resistors suitable for low-power applications, factors such as resistance range, accuracy, temperature coefficient, power consumption, and packaging size should be considered to ensure efficient and accurate current measurement and control in specific applications.