LT4276BIUFD#PBF

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Power over Ethernet (PoE) is a technology that provides power to devices over existing Ethernet infrastructure. PoE is a technology that enables power and data transmission over the same Ethernet cable, allowing a device to receive both power and data simultaneously. The LT4276BIUFD#PBF is a Power Over Ethernet (PoE) Controller IC used to control the power delivered to a remote device over an Ethernet cable.

Application Field

The LT4276BIUFD#PBF is suitable for a variety of applications, such as WLAN access points and surveillance cameras. Its 4-channel architecture is optimized to satisfy the requirements of PoE Powered Device (PD) applications, with minimal iEEE 802.3af-compliant integrated circuit (IC) components required. This IC is typically used in electronics, industrial and telecommunication applications, including those in Payment Terminal, Bank Automation, Home Security, Digital Video Cameras, and other applications that require power and data transmitted over an Ethernet line.

Working Principle

The LT4276BIUFD#PBF works by automatically detecting a PoE port. When a PoE port is detected, it starts the inrush current limitation by controlling the voltage across the MOSFETs connected to the AC/DC rectifier network. This allows the IC to reduce peak currents, over-voltages and inrush currents during start-up. The IC then forces the current in the diode rectifier network to a desired level. The instantaneous output power is then monitored and compared with the desired or programmed output power. If the output power is lower than the set level, the IC increases the voltage of the MOSFETs in the rectifier network until the programmed power level is reached. The LT4276BIUFD#PBF is also capable of controlling and managing voltage collapse, hence ensuring that the programmed or desired power level is continuously delivered. This includes over-voltage protection, over-current protection and thermal protection.

The LT4276BIUFD#PBF also uses an integrated auto-adjustable current sensing architecture that accurately measures the current in the port, allowing it to support different port types of 24V, 48V, 36V and 60V. The IC is designed for operation on low voltage systems and is compatible with most PoE applications. It features an adjustable current limit that can be set with external resistors to tailor the output power level for specific applications. Furthermore, the built-in precision current sense amplifiers reduce output ripple, providing stable current delivery and improved system efficiency.

Apart from providing power management and protection to the system, the LT4276BIUFD#PBF also has an adjustable output voltage and current trip point, offering system protection and an alarm alarm output to alert the user of an overload situation. Additionally, the IC\'s integrated load switch provides overload protection and thermal overload protection, allowing it to safely power the system and protect the device from excessive current and temperature. This is especially important for applications such as WLAN access points, where power delivery and temperature must be tightly managed to ensure reliable operation.

The LT4276BIUFD#PBF is a Power Over Ethernet (PoE) Controller IC that offers a comprehensive set of features to ensure reliable and efficient power delivery to a system. Its 4-channel architecture and integrated current sensing architecture ensure that it is capable of delivering the required power to a system and protecting it from overload and temperature overload. In addition, its adjustable current limit and output voltage and current trip point features provide an extra layer of protection to the powered devices. The IC is designed for both 24V and 48V systems, making it suitable for a variety of PoE applications.

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