MAX8702ETP+

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MAX8702ETP+ is a chip in the Power Management Integrated Circuits (PMIC) - Gate Drivers category. This chip focuses on providing reliable switch mode power supplies (SMPS) operation as well as providing the driver stage power management in a range of applications, such as motor drive, data and Serial ATA drives, and industrial automation circuits. MAX8702ETP+ is designed and manufactured with advanced components and techniques, offering low switching losses and high efficiency in any switch mode topology. The chip is optimised for high-speed switching applications, such as high-performance video graphic devices and automotive circuits, with a switching frequency up to 1.4GHz.

A main application of the MAX8702ETP+ chip is in the area of motor drive and data management. The chip integrates two power MOSFET drivers, two LM3575-type high-speed Pulse-Width Modulator (PWM) controllers, two low-impedance voltage-to-current converters (VCCS-SMPS) for SMPS applications, and an enable/disable control for automatic power shutdown. It also has four SC/DC inactive-state controls, allowing the power supply to be adjusted automatically based on feedback from external sensors. In automotive applications, the chip monitors the input voltage and adjusts the output power accordingly to help keep the motor drive and data management system running smoothly.

In terms of working principle, the MAX8702ETP+ chip primarily uses two MOSFETs to provide power switching in order to regulate the output voltage within a range of 0-4V. The primary MOSFET is connected to the output rail and is responsible for the startup switch, while the second MOSFET is connected to the ground rail and is responsible for the discharge switch. The primary MOSFET is triggered by PWM signals to start its switching cycle, while the second MOSFET is triggered by a discharge signal signal when the output voltage is above a set point. The inverse of the start switch signal is used to control the secondary MOSFET. A low-pass filter is then used to filter out the output voltage.

As well as a power switch, the MAX8702ETP+ chip integrates two PWM controllers, which generate pulse width modulation (PWM) signals to modulate the switching of the primary and secondary MOSFETs. These controllers are phase-shifted by an adjustable phase delay, which allows the chip to switch at different frequencies even though the same frequency input signal is applied. The pulse width of the generated PWM signals can be adjusted by adjusting the pulse width modulation and phase shift for the controllers. This can be used to create a wide range of switching frequencies, from low to high, to suit the needs of different SMPS applications.

The MAX8702ETP+ chip is also capable of providing two low-impedance voltage-to-current converters (VCCS-SMPS). These are used to provide a steady and predictable supply of current to the output rail of the SMPS, which helps to maximize the efficiency of the power supply. These converters can be configured in a variety of ways, allowing them to be used in a wide range of applications.

Finally, the chip also has an enable/disable control, which allows the power supply to be adjusted automatically based on feedback from external sensors. This can be useful in automotive applications, where the chip monitors the input voltage and adjusts the output power as needed. This helps to ensure a smooth operation of the motor drive and data management system.

The MAX8702ETP+ chip is a versatile and reliable PMIC for a wide range of applications, from motor drives and data management to high-performance video graphics and industrial automation. It combines a power switch, two PWM controllers, two low-impedance voltage-to-current converters, and an enable/disable control in one package, helping to increase the efficiency and reliability of the power supply. With its high switching frequency and low switching losses, the chip is an ideal solution for a variety of SMPS applications.

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