MAX1733EUK+T

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The MAX1733EUK+T is a DC-DC switching voltage regulator from the broad range of PMIC (Power Management ICs) range by Maxim Integrated. It is a high-voltage, monolithic synchronous step-down converter that is well suited to a wide array of high-voltage distributed-power architectures. Its features make it suitable for applications in numerous fields and industries. This article explains the application fields and working principle of the MAX1733EUK+T voltage regulator.

Features

The MAX1733EUK+T is capable of providing a maximum continuous output current of 3A and a maximum operating temperature of +105°C. It has a maximum input voltage tolerance of up to 36V, while the maximum output voltage is adjustable between 0.6V and 5.5V. It can accept a wide range of external MOSFETs and inductors for control system designs and comes with built-in anti-ringing circuitry for noise suppression. The device is integrated with an internal soft-start control and current-regulation circuitry, providing the lowest possible output voltage ripple.

Application Fields

The MAX1733EUK+T is suited to many high-voltage applications such as automotive powertrains, electric vehicles, and battery rail systems. It is well-suited for providing a regulated secondary power supply for various on- and off-board devices. It can further be used in other high-reliability industrial and medical applications requiring primary, multiple, and/or distributed power supplies that require high energy efficiency.

Working Principle

The MAX1733EUK+T is a DC-DC switching voltage regulator, operating by implementing the buck (step-down) topology. This topology uses a switching regulator, an inductor, and a capacitor to transform a higher input voltage into a lower output voltage, while regulating the current. As a synchronous step-down converter, the MAX1733EUK+T ensures a highly efficient and stable power conversion with minimum power loss.

In operation, the device’s pulse-width-modulated (PWM) controller operates a switch that applies an input voltage across the transformer’s primary winding. This induces a voltage across the transformer’s secondary winding, which is then rectified and smoothed by a diode and an output filter capacitor, converting the AC voltage into a DC voltage. The output voltage is determined by the duty cycle of the PWM signal and the voltage ratio of the transformer. The MAX1733EUK+T\'s high-side and low-side MOSFETs are fully integrated into the device, allowing for fast switching and providing high efficiency. It further regulates the output voltage via an open-loop voltage control with an external resistor divider.

Conclusion

The MAX1733EUK+T is a high-voltage, monolithic step-down converter that is suited for numerous applications. Its integrated anti-ringing circuitry and wide input voltage tolerance make it well suitable for multiple high-reliability and high-efficiency applications. The device adopts the buck (step-down) topology and utilizes a PWM controller in order to regulate the output voltage. Its high-side and low-side MOSFETs are integrated into the device, ensuring high efficiency and fast switching with low power loss.

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