MAX771CSA+

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The MAX771CSA+ is a controller with integrated high-side and low-side MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) designed for medium-power distributed power architecture (DPA) applications. It is an integrated DC-DC (Direct Current-Direct Current) controller, featuring a low quiescent current, low-power operation, and integrated Hall effect sensor, which is suitable for power converters operating in an intermediate voltage range (85V to 120V).

The MAX771CSA+ controller is a wide-input synchronous step-down DC-DC controller, containing a pair of low-side and high-side MOSFETs and an integrated Hall-effect current sensor. Its simple connection requires only three external components for implementing a typical Buck (step-down) converter.

The MAX771CSA+ provides an adjustable PWM (Pulse Width Modulation) switching frequency from 200kHz to 400kHz. In addition, the controller includes protection features such as an over-current protection, integrated over-temperature protection, soft-start, and output voltages of 0.8-3.3V.

Application Field:

The MAX771CSA+ controller is suitable for medium power applications such as power distribution, motor control, point-of-load (POL) conversion, and DC-DC conversion. It is ideally suited to distributed power architectures (DPA), where multiple power sources may be connected together to provide a clean, efficient and robust power supply.

For example, the MAX771CSA+ is well suited to distributed power architectures in automotive, industrial, and communication systems. It can be used to convert a bulk voltage of 85V to 120V into multiple low voltages for powering components such as microcontrollers, analogue circuits, memories, and other system control electronics.

Working Principle:

The MAX771CSA+ works by controlling the output voltage of the system. It does this by controlling the ratio between the on-time and off-time of the output voltage. The output voltage is determined by the ratio between the current in the inductor, the duty cycle control, and the voltage on the output capacitor.

The MAX771CSA+ controller is designed to minimize the use of external components. The current sensing is provided by an integrated Hall effect sensor, which allows for lossless current sensing. The controller also provides an adjustable peak current limit and adjustable switching frequency.

The controller can be configured via the serial interface to support multiple operating modes including step-down, step-up, and pulse-skip mode. In addition, the controller includes a soft-start feature to avoid inrush current.

Conclusion:

The MAX771CSA+ is a medium-power distributed power architecture (DPA) controller, which integrates a high-side and low-side MOSFET and an integrated Hall effect current sensor, designed for applications operating in an intermediate voltage range (85V to 120V). It provides adjustable PWM (Pulse Width Modulation) switching frequency, protection features such as an over-current protection, and an integrated over-temperature protection, as well as a soft-start feature. The MAX771CSA+ is suitable for distributed power architectures such as automotive, industrial, and communication systems.

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