LTC4257CDD-1#PBF

LTC4257CDD-1#PBF Application Field and Working Principle

LTC4257CDD-1#PBF is a Product Management Interface and Clock (PMIC) Power Over Ethernet (PoE) controller, designed to meet all IEEE 802.3at and IEEE 802.3af specifications. This device manages the power delivered and current flow through 2 or 4 pairs of connections. It offers several protection features, including short circuit current limit, overvoltage, overcurrent, and over temperature. This PoE controller is used in various applications, such as Industrial, Automotive, security, IP Cameras, Voice over IP, Wi-Fi Access Points, etc. Additionally, it is used in medical electrical equipment.

Description of Working Principle

The primary function of LTC4257CDD-1#PBF is to manage power delivery over a two or 4 pairs of connections, according to IEEE 802.3at and IEEE 802.3af specifications. This device can deliver up to 25.5 W of power. It also manages the power delivery and current flow. An internal switch is present on the device, which is used to select the operating voltage. It operates between two different voltages, a 19-volt voltage on the main supply, and 17-volt voltage on the auxiliary supply.

The LTC4257CDD-1#PBF has inbuilt protection features, such as short circuit current limit, over-voltage, over-current and over-temperature protection. Generally, the over-voltage protection is used to limit the voltage of the power supply. Over-temperature protection is implemented to automatically shut down the device if temperature gets too high. The over-current protection feature helps to prevent the device from drawing too much current, which could cause damage or failure.

This PoE controller has low power consumption and very excellent performance. It is manufactured with advanced process control and improved circuit design. The internal switch is used to select the main or auxiliary power supply, depending on the application requirements. Additionally, this device has an adjustable power limiting circuit. It adjusts the power limit by placing a resistor on an external pin. The current flowing through this resistor sets the maximum power that the device can deliver.

In conclusion, LTC4257CDD-1#PBF is a PMIC Power Over Ethernet (PoE) controller that is designed according to IEEE 802.3af and IEEE 802.3at specifications. It is used in various applications, such as Industrial, Automotive, security, IP Cameras, Voice over IP, Wi-Fi Access Points, etc. Additionally, this device provides several protection features. It has an inbuilt switch, which is used to select the operating voltage, and an adjustable power limiting circuit. This device has excellent performance and low power consumption.