MAX5937LCESA+

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PMIC - Hot Swap Controllers are a subset of Power Management Integrated Circuit (PMIC) designed to control the power operations of system components. One of the most popular solutions in this field is the MAX5937LCESA+, a Hot Swap Controller featuring a high-voltage power entry interface, selectable current limit and auto-retry.

Features of the MAX5937LCESA+

The MAX5937LCESA+ provides an easy way to add Hot Swap capabilities to power supplies and systems. Key features include:

• Pre-programmed Auto-Retry feature
• Programmable Current Limit from 0.2A to 81A (max)
• Secure Hot Swap and Glitch-Free Start-up
• No Under-Voltage Lockout or Over-Temperature Shutdown Required
• Integrated Interlock Inputs for Hot Swap Control
• Low Quiescent Current – Ideal for Portable Applications
• 11 Different Selectable Current Limit Settings
• Compatible with a Wide Range of Hot Swap Applications

Application Fields of the MAX5937LCESA+

Given its features, the MAX5937LCESA+ is well suited for Hot Swap applications in consumer electronics and telecom applications. The device has the ability to both provide reliable power entry and efficient current limiting over a wide range of conditions, making it a sound solution for applications that require reliable power entry. Additionally, the device has a low quiescent current and isn\'t prone to under-voltage, lockout, or over-temperature shutdown, making it a solid solution for portable devices.

The MAX5937LCESA+ is best suited for applications where low quiescent current and robust current limiting are needed. Examples include video/audio streaming devices, power supplies, telecom applications, and consumer electronic devices.

Working Principle of the MAX5937LCESA+

The working principle of the MAX5937LCESA+ is based on a linear-controlled switching power stage, which is the core element of the device. The switching power stage is enabled when the voltage across the OUT pad exceeds the specified threshold, usually 1.7V. Once enabled, the device will monitor the current flowing through the OUT pad, either relative to the SA pin or via an external sense resistor. If the current limit is exceeded, the switching power stage will be turned off and the device will enter auto-retry mode.

During auto-retry, the device will sample the current once every 12μs and restart the switching power stage if the current limit is no longer exceeded. If the current limit is still exceeded after a certain period, the device will automatically enter a retry period where the current limit will be reduced until the current limit is no longer exceeded.

The MAX5937LCESA+ also features an interlock input, allowing for additional Hot Swap-based control. The interlock input is enabled by a logic high signal and used to prevent any current from flowing through the device\'s switching power stage.

Conclusion

In conclusion, the MAX5937LCESA+ is a capable Hot Swap Controller for power supplies and systems. Its features, including pre-programmed auto-retry, low quiescent current, and interlock input make it a great choice for consumer electronics and telecom applications where reliable power entry and efficient current limit are necessary.

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