MAX889RESA+T

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DC-DC switching regulators are one of the most commonly used voltage regulation devices for applications that require a low-level, adjustable output. The MAX889RESA+T are designed to meet the industrial specification of a DC-DC converter and provide various levels of protection for the device in the event of overload and other issues. This application notes explores the field and working principle of the MAX889RESA+T.

Introduction

The MAX889RESA+T DC-DC switching regulator is a highly efficient, pulse-width modulated (PWM) buck regulator with an integrated MOSFET switch. It is suitable for power supply applications such as embedded systems, point-of-load, communications, and other distributed power systems that require low-noise, high-efficiency power supplies. It features an adjustable output voltage up to 15V, a maximum output current of 6A and a switching frequency of 500kHz.

Fields of Application

The MAX889RESA+T switching regulator can be used in a variety of applications, such as embedded systems, communications, point-of-load and distributed power systems. It is designed to meet the industrial specification of a DC-DC converter, providing various levels of protection such as over-voltage protection, over-current protection, under-voltage protection and thermal shutdown. It is capable of providing a highly regulated output voltage of up to 15V and a maximum output current of 6A.

The device is also suitable for high-voltage distributed power systems with multiple loads, since it is capable of maintaining a low phase-shift, high-frequency supplied to multiple points. The device also supports adjustable output voltage and current up to the rated limit.

Device Working Principle

The MAX889RESA+T is a PWM buck regulator, which means it produces a current pulse that is proportional to an input voltage. The device has two main sub-components: an internal power MOSFET switch and an integrated voltage reference. When an input voltage is applied to the device, the internal MOSFET switch is activated and current is allowed to flow through it. The voltage reference provides the necessary feedback to ensure that the switch is off at the time the desired input voltage is reached. The device also utilizes a soft-start circuit that prevents overloads and power supply surges.

The device also features advanced current sensing capabilities, which enable it to detect a short in the output circuit. When a short is detected, the device will activate an internal protection circuit that will shut off the power MOSFET switch and turn on an over-current monitor output.

Conclusion

The MAX889RESA+T are designed to meet the industrial specification of a DC-DC converter and provide various levels of protection for the device in the event of overload and other issues. Its adjustable output and current up to 6A make it suitable for applications such as embedded systems, communications, point-of-load, and distributed power systems. Its PWM buck regulation working principle enables it to provide a highly regulated output voltage and efficient current monitoring.

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