MAX8868ETEQ+

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The MAX8868ETEQ+ is a high-voltage linear voltage regulator designed to replace series pass transistors in power supply applications. This integrated circuit provides a low-cost solution for line and load regulation, as well as a simple means to adjust output voltage with a single external resistor (or potentiometer). Due to its low input voltage range and high output current capability, the MAX8868ETEQ+ can be used in both buck and boost converter applications.

In addition, the MAX8868ETEQ+ features a built-in power-OK (POK) indicator for monitoring of the output voltage. With the POK output, soft-start function, and internal short-circuit protection, the MAX8868ETEQ+ is ideally suited for a broad range of battery-powered equipment.

A variety of application fields can take advantage of the MAX8868ETEQ+ high-voltage linear regulator, provides the benefits of low-cost, low-voltage operation and adjustable output. Featuring integrated POK and short-circuit protection, this device is suitable for use in battery-powered devices such as portable medical equipment and white goods. In addition, it is well suited for industrial and professional applications, as well as a range of consumer applications such as personal electronic devices and automotive audio equipment.

The MAX8868ETEQ+ functions by providing a regulated output voltage by driving a proper amount of current from the input to the output. This is accomplished by the use of a low dropout voltage platform consisting of a series of PNP transistors and a cascode configuration. The PNP transistors form a constant-current feedback loop, with the output current being determined by a resistor connected in series with the output. The cascode configuration maintains power-transistor operation with a low voltage drive path to ensure proper regulation.

The output voltage adjustment is performed by adjusting the base current of the output PNP transistors. This is made through the variation of a single external component attached to the voltage divider connected between the output and the ground. As the output voltage is adjusted the Constant Current Foldback circuitry will protect the device from high current and overheating conditions.

In addition, the MAX8868ETEQ+ contains several important protection circuits, allowing it to work in push-pull or buck boost applications. These include reverse operation protection, fast turn-off protection, foldback current limiting, and over-voltage protection. This ensures the linear regulator is well-protected and will operate reliably in rugged conditions with a wide range of load current.

The MAX8868ETEQ+ high-voltage linear voltage regulator provides low-cost, low-voltage operation with adjustable output for a variety of application fields. Featuring integrated POK and short-circuit protection, this device is suitable for a range of battery-powered devices, as well as consumer and industrial applications. Its low dropout voltage platform ensures reliable operation in a wide range of input voltages, while the adjustable output allows for fine-tuning the voltage output.

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