LM399H#PBF

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PMIC, or power management integrated circuits, are responsible for monitoring and controlling the power within an electrical device. Voltage references, specifically, form an important subset of PMICs which is used for establishing a reference voltage against which other voltages can be compared, thereby allowing an accurate measurement. The LM399H#PBF, a specific device within this category of PMICs, is an excellent choice for a number of applications due to its accurate 2.5V and 4.096V references, low cost and high reliability. This article will discuss the application fields, as well as the structure and working principle for the LM399H#PBF to give an overview of the device and its capabilities.

The LM399H#PBF is a monolithic voltage reference with two independent 2.5V and 4.096V references, and is designed for use in precision analog and digital electronic equipment. The device is suitable for use in a range of applications such as voltage regulation, analog-to-digital and digital-to-analog conversion, data transmission and signal conditioning. As a direct-coupled device with a low temperature coefficient and low noise, it is well-suited to low power portable systems.

The LM399H#PBF is also extremely reliable and provides a long operating life with a maximum junction temperature of +175°C. The device has extremely high output temperature coefficients which provide up to 0.0325%/°C for the 2.5V reference and up to 0.0425%/°C in the 4.096V reference. Additionally, the power supply rejection ratio of the LM399H#PBF is very high with up to 84dB for the 2.5V reference and 79dB for the 4.096V reference.

To understand the structure and working principle of the device, it must be examined more closely. The LM399H#PBF is a 9-pin monolithic IC that consists of a series of MOSFETs, resistors, capacitors and diodes. The IC uses two independent reference voltage circuits which each produce a reference voltage of 2.5V or 4.096V, depending on the type of IC used.

The 2.5V reference is generated by a bandgap voltage reference, which creates a reference voltage proportional to the junction temperature of the device. This reference voltage is then divided down with a set of resistors to obtain the 2.5V output voltage.

The 4.096V reference is generated by a resistor-capacitor (RC) network, which is used to create an accurate reference voltage that is independent of temperature. The network consists of a series of MOSFETs, capacitors and resistors which are connected together to create two resistor-capacitor (RC) networks. The two networks are used to create an accurate reference voltage which is then divided down with a set of resistors to obtain the 4.096V output voltage.

In addition to the reference voltages, the LM399H#PBF also has a built-in voltage regulator, which is used to maintain a stable reference voltage output in response to voltage fluctuations. The voltage regulator also has a number of other important features, such as short circuit protection and overvoltage protection, which make it an invaluable component in systems that require a reliable reference voltage.

Overall, the LM399H#PBF is an excellent device for a range of precision analog and digital applications and is a reliable option for use in low power portable systems. The device is cost-effective with excellent temperature stability, power supply rejection and long operating life, which make it a desirable choice for many applications. Its two independent voltage references further ensure accurate voltage measurements, making it a perfect choice for voltage regulation, analog-to-digital and digital-to-analog conversion, data transmission and signal conditioning, amongst other applications.

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