STMicroelectronics KF33BD-TR

STMicroelectronics Part Number KF33BD-TR（PMIC - Voltage Regulators - Linear）, developed and manufactured by STMicroelectronics, distributed globally by Jinftry. We distribute various electronic components from world-renowned brands and provide one-stop services, making us a trusted global electronic component distributor.

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Introducing the STMicroelectronics KF33BD-TR, a cutting-edge voltage regulator designed to meet the demands of today's advanced electronic devices. With its exceptional performance and versatility, this regulator is set to revolutionize the power management industry. The KF33BD-TR boasts a wide input voltage range of 2.7V to 5.5V, making it suitable for a variety of applications. Its low dropout voltage of only 300mV at 300mA ensures efficient power conversion, minimizing energy loss and maximizing battery life. Additionally, this regulator offers a high output voltage accuracy of ±2%, guaranteeing stable and reliable power supply. One of the standout features of the KF33BD-TR is its ultra-low quiescent current of only 30µA, making it ideal for battery-powered devices that require long-lasting operation. Furthermore, it incorporates a built-in thermal shutdown and current limit protection, ensuring the safety and longevity of the connected components. The KF33BD-TR finds its application in a wide range of fields, including portable consumer electronics, industrial automation, and automotive systems. From smartphones and tablets to smart home devices and automotive infotainment systems, this regulator provides a reliable and efficient power solution. In conclusion, the STMicroelectronics KF33BD-TR is a game-changer in the power management industry. With its exceptional performance, wide input voltage range, and low dropout voltage, it is the perfect choice for a variety of applications. Trust in the KF33BD-TR to deliver reliable and efficient power supply for your electronic devices.

Voltage Regulators-Linear is an electronic device used to convert an unstable DC voltage into a stable DC voltage. It regulates the voltage through an active component (such as a transistor or field effect tube) and a feedback network to ensure that the output voltage remains constant within a certain range. Linear regulators usually operate under low input voltage changes and load changes, and are able to provide a very clean and smooth output voltage.

Voltage Regulators-Linear has a wide range of applications, covering almost all electronic devices requiring a stable DC power supply. In the field of consumer electronics, linear voltage regulators are widely used in mobile phones, tablets, laptops and other portable devices to provide stable voltage support for core components such as processors, memory and display screens. In the field of industrial automation and instrumentation, linear voltage regulators are often used in precision measuring instruments, sensor signal processing and other occasions because of their low noise and high precision characteristics. In addition, linear regulators also play an indispensable role in areas such as medical equipment, aerospace, and automotive electronics, where the quality of the power supply is extremely high. For example, in medical equipment, linear regulators ensure the power stability of devices such as pacemakers and monitors, ensuring the safety of patients.

• 1. What are the disadvantages of linear regulators?

  The disadvantage of linear regulators is that they are not efficient and can only be used in voltage reduction applications. The efficiency of a linear regulator depends on the ratio of output voltage to input voltage: turbidity = Vo: Vi. For example, for ordinary linear regulators, when the input voltage is 5V and the output voltage is 2.5V, the efficiency is only 50%. For ordinary linear regulators, about 50% of the electrical energy is converted into "heat" and lost, which is also the main reason why ordinary linear regulators are prone to heat when working. For LDO, due to its low voltage difference, the efficiency is much higher. For example, when the input voltage is 3.3V and the output voltage is 2.5V, its efficiency can reach 76%. Therefore, in LCD color TVs, in order to improve the utilization rate of electrical energy, ordinary linear regulators are used less, while LDOs are used more.

• 2. When should a linear regulator be used instead of a switching regulator?

  In low-power and low-frequency application scenarios, a linear regulator should be used instead of a switching regulator.
  Linear regulator Suitable for low-power and low-frequency applications, with simple circuit structure, low noise and good stability. They control the output voltage of the transistor through a current amplifier to keep the output voltage stable. This working mode makes linear regulators perform well in low-power and low-frequency applications, although they are less efficient and generate more heat, and their application range is limited. In contrast, switching regulators use high-frequency pulse modulation technology to convert input voltage into a stable output voltage. They have the advantages of high efficiency, small size and fast response, and are suitable for high-power and high-frequency applications. Therefore, when the application requirements are not the main considerations for circuit complexity and cost, but have high requirements for the stability and

• 3. What is the difference between a linear regulator and a resistor?

  Linear regulators and resistors have significant differences in function, working principle and application scenarios.
  Function and working principle:
  A linear regulator is an electronic device that achieves a stable voltage output by adjusting linear elements (such as resistors, transistors, etc.) in the circuit. It uses the negative feedback principle. When the input voltage changes, the regulator senses this change and adjusts the parameters of the circuit elements (such as the resistance value or the conduction state of the transistor) accordingly to keep the output voltage stable within the required range. Linear regulators can provide lower output noise and fluctuations, and have better responsiveness to load changes.
  Resistors are a basic electronic component used to limit current and divide voltage. It works by hindering the flow of current, has a fixed resistance value, and does not have the function of adjusting the output voltage.
  Application scenarios:
  Linear regulator