STLUX325ATR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Applications:	Lighting
Current - Supply:	--
Voltage - Supply:	3 V ~ 5.5 V
Operating Temperature:	-40°C ~ 105°C
Mounting Type:	Surface Mount
Package / Case:	32-VQFN Exposed Pad
Supplier Device Package:	32-VFQFPN (5x5)

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STLUX325ATR is a power management integrated circuit (PMIC) and belongs to the category of Specialized. Within this context, the application and working principle of the STLUX325ATR will be discussed in more detail. The STLUX325ATR, produced by STMicroelectronics, is a Buck converter and primarily used to reduce the voltage of a power source to what is needed by the electronic circuit, providing a steady voltage and current. This active power optimization is especially beneficial when several circuits require different voltage, due to the constant and elevated temperatures present in high-power, high-performance electrical components. Furthermore, the STLUX325ATR is designed to operate at a high-frequency and is capable of synchronizing its output frequency with the input of the switched-mode power supply circuit. This allows for a greater degree of precision in the conversion of the voltage. The most recognizable applications of the STLUX325ATR is the stabilization of the output voltage for xDSL, Packet Over SONET and TDMA communications equipment. As telecommunications technology has advanced, the demand for devices such as the STLUX325ATR has increased drastically. The variety of electronics found in telecommunications, including but not limited to baseband modems, cables and lines, imply the need for different voltages. This was an issue before the introduction of the STLUX325ATR, as the output voltage had to be manually set to the desired voltage. This was both time consuming and often inaccurate, leading to instability and a reduced quality of network links. However, the STLUX325ATR is capable of resolving this issue. According to the specifications of this PMIC, the output voltage is adjustable, ranging between 0.8 V to 2.6 V. This is accomplished through one of two possible methods (depending on the configuration): Pulse Width Modulation (PWM) or Pulse Frequency Modulation (PFM). Pulse Width Modulation is implemented through using a controlled switch to vary the Duty Cycle (the ratio between the time that the switch is on, and off, over a single cycle). The frequency of the switch is usually constant, unless the PWM is combined with a feedback circuit, allowing for a dynamic change of the duty cycle if necessary. Due to this feature, the voltage in the output can be regulated and stabilized. Pulse Frequency Modulation, on the other hand, consists on controlling the frequency at which the switch operates. This is what is mainly used in the STLUX325ATR, as it provides more precision. The output frequency is proportional to the duty cycle. As adjusting the frequency is easier than adjusting the duty cycle (which requires precise manipulation), the STLUX325ATR also integrates a control loop, allowing the user to control the output frequency, and ensuring that the voltage is correctly regulated.The STLUX325ATR also shows a very good load and line regulation. This refers to two distinct functions the Buck converter is responsible for: providing a steady output voltage, regardless of changes in load, and maintaining this output voltage with very low variations, in spite of possible changes in the input voltage. In conclusion, the STLUX325ATR is a PMIC categorized as a specialised device, due to its ability to be used in many sorts of telecommunications devices, as well as other kinds of electronics. It is capable of providing a steady and regulated output voltage, ranging from 0.8 V to 2.6 V, while maintaining a very good load and line regulation. The STLUX325ATR can be configured to use two distinct control methods, Pulse Width Modulation or Pulse Frequency Modulation, to control the duty cycle and frequency of the switch, respectively.

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