MAX5975AETE+

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Power Management Integrated Circuit (PMIC) plays an increasingly important role in today’s electronics gadgets. As the leading edge technology integrated circuit manufacturers around the world, PMIC has become the power solution for computer, communication, industrial, automotive and other equipment. As an important type of PMIC, AC/DC converters, offline switchers and other products provide a safe, efficient and reliable power supply. MAX5975AETE+ is a representative of such type, which offers better performance and improved efficiency over the traditional AC/DC converter. In this article, we will discuss the application fields and the working principle of MAX5975AETE+.

Application Field of MAX5975AETE+

MAX5975AETE+ provides flexible and efficient power management of PCB-mounted devices in many application fields.

• Communication System: MAX5975AETE+ is an ideal choice for communication system due to its low on-resistance and high efficiency. It helps to reduce the energy loss during power transmission and ensures the stability of communication system.
• Industrial Instruments: For industrial equipments, MAX5975AETE+ has a wide temperature operating range and provide better control and protection. It can protect the industrial instruments against voltage spikes and outliers.
• Automotive Applications: MAX5975AETE+ is suitable for use in many automotive applications, such as Autonomous emergency braking, driver assistance driving support, electric drive control and car bodyweight management.

Working Principle of MAX5975AETE+

MAX5975AETE+ is based on a PWM switching topology, with a fixed frequency of 260 KHz to control current and voltage. The PWM drives the external MOSFET and power inductor to form a buck-boost converter, where the output voltage can change from 0.8V to 1.425V. The power inductor acts as the energy storage device, enabling the MOSFET to switch with a constant frequency thereby providing a regulated output voltage.

At power on stage, the MOSFET is enabled by the VSEN1 rising reference. As the power inductor has been charged, the current flows through the diode and starts to charge the output capacitor and deliver power to the load. As the voltage of the output capacitor reaches the target voltage, the MAX5975AETE+ begins to move the signal of PWM, regulating the MOSFET to off-state. While the signal of PWM is low, the power inductor continues to charge the output capacitor, until the voltage of the output capacitor reaches the target voltage. When the signal of PWM is released, the MOSFET switches back, providing the current to the load. During the off-time, the power inductor discharges it’s stored energy, thus enabling the output voltage to reach or remain at the target voltage.

The MAX5975AETE+ also integrates an accurate current regulation loop which controls the current flowing to the load by regulating the off-time of the PWM. This regulation loop is activated whenever the current drawn from the output exceeds the current limit set in the configuration register.

Overall, MAX5975AETE+ is a great choice of AC/DC converter and offline swither, which can offer higher efficiency and better performance than some traditional AC/DC converters. Its flexible application field and elegant working principle make it a best fit to many PCB-mounted technologies.

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