LM4040C82IDCKR Integrated Circuits (ICs)

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Introduction

LM4040C82IDCKR is a programmable, rail-to-rail output micro-power voltage reference designed to provide high accuracy over an industrial temperature range. The device provides 4 reference voltages (1.250 V, 2.048 V, 2.500 V and 4.096 V) with a total accuracy of 0.05% across the temperature range. It requires just 0.2 μA of current, has a low power shutdown mode (1 μA) and a maximum voltage of 17 V which make it suitable for applications in a wide variety of equipment from by industrial to battery powered. In this article we aim to explain its application area and working principle.

Application Area

Industrial Sensors, Meters and Control System

LM4040C82IDCKR is ideal for use in industrial sensing applications. It’s high accuracy and low power requirements make it a great choice for use in devices that work with sensitive sensor readings. Its rail-to-rail output can also provide excellent linearity when used with DACs and/or analog to digital converters. Its low power requirements also make it especially useful for distributed industrial control systems, as its low power allows for low-voltage, low-noise operation.

Battery-backed System

The low power requirements and the availability of a shutdown mode in the LM4040C82IDCKR make it an ideal choice for battery-backed systems. These types of systems are used in critical applications where reliability is paramount, such as military, medical, and aerospace. With the ability to function even when the primary power source is removed, LM4040C82IDCKR ensures that the system can stay running so that the device can still perform its required task, even in the absence of a main power source.

Automotive applications

The LM4040C82IDCKR is also well suited for automotive applications, such as fuel injectors, alternators, and engine control systems. With its low power, high accuracy, and wide temperature range, the device is ideal for use in the harsh automotive environment. The devices can provide stable and accurate outputs for car’s ECU and the surrounding controllers. It does so without requiring too much power.

Working Principle of LM4040C82IDCKR

The LM4040C82IDCKR is based on a bandgap reference, which is an integrated circuit (IC) that provides a voltage output that is proportional to a bandgap voltage reference. This reference voltage is set by a resistor that is internally pulled up. The outputs of the device include the reference voltage at one terminal and the output voltage at the other terminal. When the voltage at the output terminal increases, the difference between the two terminals increases, resulting in a current being drawn from the resistor and into the IC through the feedback loop, thereby adjusting the output voltage.

The LM4040C82IDCKR utilizes a low gain operational amplifier (op-amp) and a band gap regulator to adjust the output voltage to meet the desired reference voltage within the temperature range specified for the device. The operational amplifier is used to amplify the difference between the reference voltage and the output voltage so that the band gap regulator can make the necessary adjustment to maintain the fixed voltage.

The LM4040C82IDCKR also features a low power shutdown mode. In this mode, the device draws only 1 mA from the power supply and does not produce any output. This feature can be very useful for conserving power in battery-backed systems, for example.

Conclusion

The LM4040C82IDCKR is a precision voltage reference ideal for a wide range of high accuracy applications, especially in industrial and battery-backed systems. It is capable of achieving accurate outputs over a wide temperature range with just 0.2 μA of current, while still being able to enter a low power shut-down mode if desired. Its accuracy is improved further by its use of a low gain op-amp and a band gap regulator in its design.

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