MAX1954CEUB+T

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MAX1954CEUB+T Application Field and Working Principle
The MAX1954CEUB+T is an adjustable, integrated, step-down switching controller with integrated MOSFET drivers. It is part of the PMIC (Power Management Integrated Circuit) Voltage Regulators DC DC Switching Controllers series. It is used in various applications such as energy-optimized DC-DC applications, Li-Ion/Li-Polymer battery-powered systems, motor control, and distributed power systems. This application note discusses the features and working principles of the MAX1954CEUB+T.

Features of MAX1954CEUB+T
The MAX1954CEUB+T integrates both the controller and driver functions in a small, space-saving package. It also features a built-in current sense resistor and MOSFET driver that can support up to 27V of output voltage. The device has up to 95% efficiency in all load conditions, and can achieve a 1.8V ±2% voltage accuracy. The switching frequency is adjustable from 300 kHz to 2 MHz, allowing for power saving in low frequency mode. In addition, the device also offers undervoltage lockout with hysteresis, output open-drain fault flag, and power good indicator.

Working Principle of MAX1954CEUB+T
The MAX1954CEUB+T operates in a PWM (Pulse-Width Modulation) mode and uses two current-sensing methods: analog and digital. In the analog mode, an external resistor senses the current in the MOSFET driver and the output voltage is supplied to the controller. The controller then adjusts the duty cycle of the PWM signal to maintain the output voltage at its set point. In the digital mode, the device uses an internal comparator to compare the sensing voltage of the external resistor to a voltage threshold and then adjusts the duty cycle accordingly. The MAX1954CEUB+T also utilizes an adaptive current control to maintain the highest efficiency in all load conditions.

Conclusion
The MAX1954CEUB+T is an adjustable, integrated, step-down switching controller with integrated MOSFET drivers that can operate in both analog and digital modes. It has up to 95% efficiency in all load conditions and an adjustable switching frequency from 300 kHz to 2 MHz. It also has undervoltage lockout with hysteresis, output open-drain fault flag, and power good indicator. This device is ideal for applications such as energy-optimized DC-DC applications, Li-Ion/Li-Polymer battery-powered systems, motor control, and distributed power systems.

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