LTC4269IDKD-1#PBF

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The LTC4269IDKD-1#PBF is a Power-over-Ethernet (PoE) Controller designed to control the power delivered to a PoE-enabled device. It is ideal for applications such as Ethernet switches, VoIP phones, wireless Access Points, and other types of LAN equipment. The LTC4269IDKD-1#PBF provides the flexibility to regulate PoE power using either a voltage or current-mode control.

The LTC4269IDKD-1#PBF can provide up to 60V at up to 25 Watts of power for a directly connected Powered Device (PD). It also includes an Auxiliary DC/DC converter for point-of-load applications. The Auxiliary DC/DC converter module supports a wide range of output currents, from 0.2A to 1.8A, and can support voltages up to 18V.

The LTC4269IDKD-1#PBF provides a wide range of protection features including over-current, over-voltage, over-temperature and brown-out protection. It also features automatic shutdown in the event of a fault condition. The LTC4269IDKD-1#PBF is designed to meet the requirements of IEEE 802.3at and related standards. It also features a wide operating temperature range of -40°C to +85°C.

The LTC4269IDKD-1#PBF\'s power control circuit is designed to provide precise control of the PD\'s power consumption by setting the PD\'s current draw to the desired level. The power control circuit includes a Push-Pull Buck Converter and two error amplifiers that provide input voltage and current feedback. The Push-Pull Buck Converter regulates the voltage on the PD section by modulating the control signal at the Switch Node.

The LTC4269IDKD-1#PBF\'s current mode control also regulates the PD current by modulating the PWM duty cycle based on the detected PD current. The current mode control circuit continuously monitors the device\'s power consumption and adjusts the duty cycle of the PWM signal. The duty cycle of the PWM signal is adjusted to provide the desired power level to the PD.

The LTC4269IDKD-1#PBF also provides an onboard circuit breaker that provides additional system protection at the point-of-load. This ensures that the PD will not exceed the maximum current limit. The circuit breaker has a trip threshold of 20A, and features an adjustable trip time to provide a wide range of response times to over-current conditions.

The LTC4269IDKD-1#PBF also includes a wide range of serial parameters that can be used to customize the device for a specific application. It includes an I2C bus interface for communication, as well as an analog input for programming the outputs. The I2C bus interface allows for control and monitoring of the device, as well as access to the output voltages and currents.

The LTC4269IDKD-1#PBF provides a complete solution for power delivery to PoE-enabled devices. It features a wide range of protection features and provides adjustable current limits to safely regulate the power delivered to the device. The LTC4269IDKD-1#PBF is designed to meet the requirements of IEEE 802.3at and related standards and provides a low-cost solution for providing reliable power delivery to PoE-enabled devices.

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