LM4040A25IDBZTG4

PMIC - Voltage Reference: LM4040A25IDBZTG4 Application Field and Working Principle

The LM4040A25IDBZTG4 is a voltage reference IC, specifically part of Texas Instruments’ family of Micropower Precision Shunt Voltage References. In this case, the LM4040A25IDBZTG4 is an ultra low-power shunt regulator with a guaranteed temperature drift of 1.5 ppm/℃. At first glance, due to its endless potential applications and wide variety of form factors, it can be easy to assume the LM4040A25IDBZTG4 can be used for pretty much anything, yet it is actually best applied to low-power, low-voltage circuits that require precise voltage references over extended operating temperature ranges.

The LM4040A25IDBZTG4 is capable of a wide range of functional voltage reference output values, from 1.25V up to 20 volts, making its range of applications very broad and convenient for many different types of circuits. Some of the most common applications are in low-voltage analog-to-digital converters, low-power microcontrollers, RF power amplifiers, and lithium battery charging circuits. This device is especially useful in temperature sensitive or very low-power operations that demand a constant reference voltage. Although the LM4040A25IDBZTG4 is capable of outputting up to 20V, typical microcontroller operations or other low-voltage operations tend to only require a few mV, or even a few dozen µV. The LM4040A25IDBZTG4 is perfectly suitable for these tasks, as it has a remotely adjustable output reference voltage.

LM4040A25IDBZTG4 Working Principle

The LM4040A25IDBZTG4 integrated circuit uses an internal output current source and an external adjustable resistor divider circuit that is connected between the two output terminals to achieve its adjustable output voltage reference range. Specifically, the current source generates a very precise current that is based on TO-92 temperature. This current is then applied to the remote divider/feedback network and feeds into the output pin before eventually being regulated across the device’s output terminal. By application of different configurations of reference and internal resistance, the LM4040A25IDBZTG4 provides the user with precise elements of reference voltage.

As a shunt voltage regulator, the LM4040A25IDBZTG4 is a low power consumption device that obtains its power from two external current sources. The two external current sources (defined as Vcc and Vee) are connected as a source of a constant voltage to the input terminals of the LM4040A25IDBZTG4. During operation, the LM4040A25IDBZTG4 takes a portion of the constant voltage from the input terminals to adjust the output voltage. To ensure that the adjustable output voltage remains stable and precise, the device utilizes the external adjustable resistor divider in the predefined manner.

Performance of the LM4040A25IDBZTG4

The performance of the LM4040A25IDBZTG4 reference IC is what sets it apart from other voltage references. It is incredibly precise, capable of outputting a maximum of 25ppm to 5ppm voltage error over a large temperature range. The device also consumes very few resources, operating at only 300µA and with a quiescent current of only 100µA. This makes the LM4040A25IDBZTG4 very suitable for low-power operations.

The LM4040A25IDBZTG4 also has a wide range of input and output voltage options, ranging from 1.25 volts and up to 20V, making it quite versatile for a wide variety of applications.

The precision performance and extended operating temperature range of the LM4040A25IDBZTG4 also make it suitable for various military and aerospace applications. Its smalldevice form factor further increases the versatility of the LM4040A25IDBZTG4 in these sensitive applications.

Conclusion

The LM4040A25IDBZTG4 Voltage Reference is incredibly precise and suited for a wide range of applications, making it perfect for low-voltage analog-to-digital converters, microcontrollers, RF power amplifiers, and lithium battery charging circuits. The LM4040A25IDBZTG4 consumes very few resources and boasts a temperature drift of just 1.5 ppm/℃, making it suitable for military and aerospace applications as well.