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Based on 5965A/MAX5965B power controller application circuit
The MAX5965A/MAX5965B are advanced, quad-channel power controllers designed for IEEE 802.3af and pre-IEEE 802.3at compliant Power Sourcing Equipment (PSE). These single-chip solutions provide essential functions such as Power Device (PD) detection, classification, current limiting, and both DC and AC load disconnect detection, ensuring full compliance with the IEEE 802.3af standard. They are pin-compatible with other popular models like the MAX5952, MAX5945, LTC4258, and LTC4259A, while offering enhanced features to improve system performance.
These devices support high-power modes, delivering up to 45W per port, making them ideal for applications requiring higher power delivery. They introduce new classifications such as Class 5 and Class 2 (Class 6), which allow for more accurate detection and classification of high-power PDs. The I²C interface enables real-time monitoring of current at each port, providing greater control and flexibility. Additionally, they support large-capacity PD detection, helping identify early-stage devices that may not be fully compatible.
The MAX5965A/MAX5965B feature a fully programmable I²C-compatible 3-wire serial interface, allowing for software configuration and customization. This flexibility enhances system adaptability and supports on-site diagnostics. The hierarchical overcurrent detection mechanism ensures that the system can accurately monitor and respond to excessive sink currents from connected PDs, improving overall safety and reliability.
The devices offer four operational modes: Auto mode for automatic operation, Semi-Automatic mode for device detection and classification after initialization, Manual mode for complete software control ideal for diagnostics, and Shutdown mode for safe power termination. Each mode is tailored to meet different system requirements and user preferences.
In terms of protection, the MAX5965A/MAX5965B include a wide range of built-in safety features such as input undervoltage lockout (UVLO), input undervoltage detection, load-safe detection during power-up, input overvoltage lockout, overtemperature protection, output voltage slew rate control, power-good signals, and fault indication. Additional programmable features include startup timeout, overcurrent timeout, and load disconnect detection timeout, giving users greater control over system behavior.
Available in a 36-pin SSOP package, these ICs are suitable for industrial and commercial applications, operating across extended temperature ranges from -40°C to +85°C. A typical operating circuit diagram is provided for reference, showing how the device can be integrated into a power-over-Ethernet (PoE) system.
Whether you're designing a PoE-enabled network or upgrading an existing system, the MAX5965A/MAX5965B offer a robust and flexible solution. Their advanced features and compatibility with existing designs make them a valuable choice for engineers working on power management systems.
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