LM4040BIM3-2.5/V+T

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Power management integrated circuits (PMICs) are essential components in modern electronics systems. They comprise a variety of voltages, gate drivers, regulators, and other functional components, which, when employed in an integrated circuit, all are designed to provide power to the electronic system.

A voltage reference is a specialized form of PMIC which, as its name suggests, provide a highly accurate and stable source of reference voltage for a variety of electronic components. The LM4040BIM3-2.5/V+T is one such PMIC voltage reference, designed to provide highly accurate, low noise and low power reference voltage.

Application Field

The LM4040BIM3-2.5/V+T voltage reference is a fixed 2.5V precision fractional-scale bandgap reference. The output voltage conforms to the EIA-799A basic performance and extended performance specifications. This device is used as a voltage reference and voltage divider in a variety of Electronic systems, especially in digital signal processing, voltage control, feedback, and servo control systems.

Working Principle

The LM4040BIM3-2.5/V+T voltage reference utilises bandgap reference technology. The bandgap reference works by utilizing the temperature-independent characteristics of a diode and the temperature dependent characteristics of a bipolar junction transistor (BJT).

The basic circuit uses two diodes, D1 and D2, to create a temperature independent voltage. The base-emitter of the BJT, B1 is then connected between the two diodes, which results in the output voltage being proportional to the temperature of the transistor. The output voltage is regulated by a precision programming resistor between the transistor and the output terminal.

The LM4040BIM3-2.5/V+T voltage reference also offers a degree of protection against reverse current. This is achieved through the use of an internal series diode which operates as a back-biased diode-capacitor combination at the reference output. This allows the device to protect against reverse current without compromising the accuracy of the output voltage.

The LM4040BIM3-2.5/V+T voltage reference offers excellent performance, with an output voltage accuracy of ±0.10% over a temperature range of 0°C to 70°C. It also features a low operating current of only 1.3mA and a low reference temperature coefficient of only 5ppm/°C.

These features make the LM4040BIM3-2.5/V+T voltage reference a versatile and highly accurate voltage reference suitable for a wide range of applications. It is especially suitable for use in precision analogue and digital applications where low power consumption, high accuracy and tight tolerance on the reference voltage are essential.

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