LM4040B25FTA

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The LM4040B25FTA is a voltage reference offered by Texas Instruments. It is part of the family of precision voltage references and is classified as a PMIC (Power Management Integrated Circuit). This PMIC voltage reference is designed to deliver an extremely accurate, low noise output while operating with minimal power consumption. The device is especially well-suited for applications that require extreme accuracy, such as medical and instrumentation where stability and accuracy are essential.

The LM4040B25FTA is available in a virtually limitless range of output voltage levels ranging from 1.2 V to 12 V. It provides superior accuracy over temperature and time with its initial accuracy of ±0.5 mV and temperature accuracy of ±5ppm/°C over a -40°C to +125°C range. The device has a very low temperature coefficient of less than 20ppm/°C and its drift is less than 5 μV/°C. Additionally, the device provides excellent line regulation; across the input voltage range of 4.5 V to 18 V, LM4040B25FTA exhibits an accuracy of ±0.2 mV/V. These features make the LM4040B25FTA an ideal choice for precise regulation.

The LM4040B25FTA operates with a supply voltage of 4.5 V to 18 V and has an output of a 2.5 V reference voltage. It has a quiescent current of 70 μA and a maximum output current of 5 mA. The forward voltage drop is low, with a typical output voltage of 2.4 V for a 3 V input voltage. The internal Sink/Source resistance is very low, with typical resistance of 0.1 Ω. It also has a fast settling time of 6 μs. With these specifications, the LM4040B25FTA is the ideal choice for precise voltage regulation applications.

The LM4040B25FTA can be used in a wide range of applications such as precision voltage dividers, linear startup circuits, and battery-powered systems. The device is well-suited for other systems that require high accuracy such as test and measurement, medical/analytical instrumentation, battery chargers and uninterruptible power supplies (UPS). It can also be used in logic level shifting, amplifier biasing and memory bus voltage regulation.

The LM4040B25FTA’s working principle is simple and straightforward. In a typical application, the device is operated in a voltage divider configuration, with the two resistors being used to vary the reference voltage. With the resistors in place, the device produces an output voltage that is a fraction of the input voltage. To understand the working principle of the LM4040B25FTA, think of it like this: The internal amplifier used by the device amplifies the difference between the voltages on its inputs (VIN+ and VIN-). The gain is determined by the ratio of the resistors on each input, with the output voltage equal to VIN+ multiplied by the resistor ratio.

The LM4040B25FTA is an excellent choice for applications requiring reliable and precise reference voltage regulation. With its low quiescent current, low voltage drop, and superior regulation accuracy, the device is ideal for precision voltage regulation in a wide range of applications. With its wide range of features, the LM4040B25FTA is a great option for designers looking for an accurate, low-power, and reliable voltage reference.

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