MAX4272ESA+T Integrated Circuits (ICs)

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Power Management Integrated Circuits (PMICs) have become a critical component of many electronics systems, including the MAX4272ESA+T, which is a hot-swap controller that helps protect system loads from in-rush current during power-up and hot-swap cycles. The MAX4272ESA+T is intended for use in applications such as computing, communication and data storage, as well as automotive and industrial systems. This article will provide an overview of the MAX4272ESA+T application and working principle.

Overview and Features of MAX4272ESA+T

The MAX4272ESA+T is a 3A, ultra low-power hot-swap controller with low-impedance circuitry and an internal MOSFET. It provides current limit, slew-rate control, and over-voltage, over-temperature and inrush current protection. Its low-power and low-noise design are tailored for low-component-count, space-constrained systems that are powered by on-board voltage regulators such as 3.3V, 5V, 12V and adjustable voltage buck converters. Additionally, the MAX4272ESA+T offers improved performance over competing solutions, allowing it to reduce power loss to less than 5mW in a small package.

The key features of the MAX4272ESA+T include:

• Low-power (<2µA) and low-noise design
• Low-impedance circuitry and internal MOSFET
• LED open/short/over-temperature/over-current indicator
• Programmable slew-rate control for reduced inrush current
• Over-voltage protection
• Over-temperature protection
• 3.3V to 20V power supply range
• Load voltage range from 2.5V to 24V
• Output current up to 3A
• Thermally enhanced 3-pin DFN6 with exposed thermal pad

Use Cases

The MAX4272ESA+T can be used in a wide range of applications, including enterprise and computer systems, telecommunications, industrial equipment, and automotive systems. It is particularly well-suited for notebook PCs, hard drives and blade servers, among others. Due to its low-power and low-noise design, the MAX4272ESA+T is also suitable for small systems that require a large amount of current and operate at a low voltages, such as FPGAs, ASICs, Li-ion batteries and other power sensitive applications.

Application

The MAX4272ESA+T is designed for use in hot-swap applications. The device acts as a protection circuit that prevents the load from being damaged by an inrush current when it is connected to a power source. It also provides slew-rate control, allowing the current to be ramped up in a gradual and controlled manner. Additionally, the MAX4272ESA+T can be used to detect over-temperature and over-current conditions to protect the load from damage.

Working Principle

The MAX4272ESA+T works by sensing the voltage at the load and comparing it to a user-programmed threshold. When the load voltage exceeds the threshold, the device turns on an internal MOSFET switch, allowing the current to flow and the voltage to ramp up. The MAX4272ESA+T then monitors the current and voltage signals, and will shut off the MOSFET switch if the current reaches the programmed maximum current limit or if the voltage reaches the over-voltage protection threshold. This process protects the load from damage due to inrush current and over-voltage conditions.

The MAX4272ESA+T also provides over-temperature protection, which can be activated if the device\'s internal temperature exceeds the programmed threshold. When this protection is enabled, the MOSFET switch is shut off and the device will remain off until the temperature falls below the threshold. Additionally, the MAX4272ESA+T provides a LED indicator to indicate when the device is shut off due to over-temperature or over-current conditions.

Conclusion

The MAX4272ESA+T is an ultra-low-power hot-swap controller with a low-noise and low-impedance design that makes it well suited for applications where small size and maximum efficiency are desired. Its slew-rate control and over-temperature and over-voltage protection make it ideal for use in hot-swap applications, and its 3A output current rating allows it to handle a wide range of applications. Its low-power and low-noise design also make it suitable for use in small, space-constrained systems.

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