MAX5053BEUA-T

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The MAX5053BEUA-T is a voltage regulator DC/DC switching controller for high-efficiency synchronous buck converters, featuring 300mA/400mA drive capability and low quiescent current. It offers excellent light-load efficiency for low-power applications. The MAX5053BEUA-T can also be used as an synchronous rectifier controller or a secondary side synchronous rectifier controller. It is designed to increase efficiency, reduce noise, and reduce board space when used with synchronous step-down converters.

Features of MAX5053BEUA-T

• Wide input voltage range: 4.5V to 42V
• Output current up to 200mA
• 300mA/400mA gate drive
• 2.6mΩ typical on resistance
• 8A peak switch current
• Prebiased startup and bootstrap startup
• Slew-rate control for output capacitor ripple prevention
• Integrated current sense amplifier
• Integrated open-drain enable function
• Dual-mode output voltage rising control
• Wide power range selection

Applications

The MAX5053BEUA-T is ideal for Li-Ion and Li-polymer battery applications such as cell phones, PDAs, digital cameras, MP3 players, and portable HDD drives. It is also indicated for USB power supplies and general CEC/SYNC buck applications, as well as automotive, industrial, and communication power supply applications.

Working Principle

The MAX5053BEUA-T synchronous buck controller is designed to provide high-efficiency DC-DC conversion. It operates by supplying high- and low-side MOSFETs with a controlled voltage waveform determined by the input and output voltages. The waves are typically symmetrical, with a fixed on-time determined by the input voltage and an adjustable off-time determined by the output voltage.

The power switch current is sensed by an integrated current-sense amplifier (CSA) which monitors the V DS voltage of the MOSFETs. This voltage is then compared to a programmable target voltage set by an external resistive divider. If the sensed voltage exceeds the target voltage, the CSA will calculate the duty cycle of the switch FET and send this data to the PWM comparator. The Duty-Cycle will then be adjusted accordingly to ensure that the current limit is maintained.

Other key features of the MAX5053BEUA-T include a prebiased startup and a slew rate control circuit which can be used to limit the ripple on the output voltage caused by capacitors. The controller also includes an open-drain enable input which can be used to monitor and control the operation of the controller.

Conclusion

The MAX5053BEUA-T is a great choice for meeting the challenges of high-efficiency DC-DC conversion and reducing board space, cost, and noise. Its wide input voltage range, integrated current sense amplifier, and slew rate control capabilities provide designers with a simple and reliable solution for a variety of applications. Thanks to its high-performance features, the MAX5053BEUA-T is ideal for use in automotive, industrial, communication, consumer electronics, and other applications.

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