MAX5903LBETT+T

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Power management integrated circuits (PMIC) are a vital part of modern electronics. Especially for high-power applications, PMICs implement current and voltage regulation, power sequencing, and fault monitoring. Power supply control and hot-swap functions are needed for high-power applications. In this article, we will take a look at the MAX5903LBETT+T/-T, a PMIC from Maxim Integrated, and its application field and working principle.

The MAX5903LBETT+T is a hot-swap controller with active in-rush current limit and thermal foldback. Hot-swap controllers provide the necessary protection and control interface between the power supply and a sensitive voltage rail. They ensure that system components are not damaged during insertion into live circuits. In addition, hot-swap controllers provide overcurrent protection for the circuit and prevent in-rush currents that may otherwise cause disruption during insertions.

The MAX5903LBETT+T has several features that make it ideal for hot-swap control:

• Active in-rush current limit prevents large voltage droops caused by high in-rush currents during insertion into live circuits.
• Thermal foldback that reduces on-state resistance as die temperature increases.
• Fault-status monitoring and reporting.
• Configurable soft start and over-temperature shut-off.

The MAX5903LBETT+T is ideal for a range of applications, including telecom/networking, servers, AC/DC power supplies, automotive, and industrial. It is capable of providing up to 10A of current and has a maximum input voltage of 25V. The MAX5903LBETT+T has several potential uses in these applications, such as providing overcurrent and over-temperature protection for power supplies and in hot-swap applications where large in-rush currents may cause large voltage droops.

The MAX5903LBETT+T works by continuously monitoring the voltage across the power supply rail. When the device detects a voltage drop indicating an insertion event, it turns on the N-channel MOSFET, allowing current to flow through the load. The MAX5903LBETT+T then limits the current to its pre-set limit. Once the power is reduced to the desired level, the device shuts off the MOSFET. If the voltage across the rail drops below a set threshold, the MAX5903LBETT+T will shut off the MOSFET to protect the system.

The MAX5903LBETT+T also features thermal foldback. Thermal foldback reduces the maximum output current of the system as the die temperature increases. This helps reduce the power dissipation of the system, making it more efficient. The MAX5903LBETT+T also has fault-status monitoring and reporting, allowing the system to detect and report faults in the system.

In summary, the MAX5903LBETT+T is a hot-swap controller with active in-rush current limit, thermal foldback, fault-status monitoring and reporting, and configurable soft start and over-temperature shut-off. It is ideal for a range of applications, including telecom/networking, servers, AC/DC power supplies, automotive, and industrial. The MAX5903LBETT+T works by continuously monitoring the voltage across the power supply rail and limiting the current to its pre-set limit. It also features thermal foldback and fault-status monitoring and reporting.

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