LTC9105

推荐新设计使用

IEEE 802.3bt PD with Telemetry and Power Priority

数据手册 (Rev. A) 产品选型表
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产品技术资料帮助

ADI公司所提供的资料均视为准确、可靠。但本公司不为用户在应用过程中侵犯任何专利权或第三方权利承担任何责任。技术指标的修改不再另行通知。本公司既没有含蓄的允许，也不允许借用ADI公司的专利或专利权的名义。本文出现的商标和注册商标所有权分别属于相应的公司。
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产品详情

  • IEEE 802.3bt Powered Device (PD) Controller
  • 400kHz I2C Interface
  • Continuous Voltage, Current, and Power Telemetry
  • Dedicated 14-Bit Delta-Sigma Current and Voltage ADCs
  • Automatic Maintain Power Signature (MPS)
  • Supports Up to 90W PDs with Extended Power
  • 5-Event Classification Sensing with PSE Allocated Power Readback
  • Seamless Switchover between Dual PD or PD/AUX Inputs
  • Superior Surge Robustness (100V Absolute Maximum)
  • Wide Junction Temperature Range (-40⁰C to 125⁰C)
  • External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
  • 50mΩ Current Sense Resistor
  • Auxiliary Input Sense with Standby Modes
  • 20-Pin 5mm x 5mm QFN Package
LTC9105
IEEE 802.3bt PD with Telemetry and Power Priority
LTC9105 Typical Application LTC9105 Pin Configuration LTC9105 Chip Illustration
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参考资料

数据手册 1

用户手册 1

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软件资源

Evaluation Software 1

C API Documentation

The C API Documentation for this PD may be requested from the Software Request Form (SRF). This C API Documentation describes the I2C interface and programming details for the respective PD controller.

评估套件

eval board
schematic 1
schematic 2
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EVAL-LTC9105-AZ

EVAL-LTC9105-AZ: LTC9105, MAX5974C, LT4321, and ADuM1252 IEEE 802.3bt Powered Device with I2C Telemetry

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特性和优点

  • IEEE 802.3bt-compliant Class 6 PD
  • Port telemetry with an isolated I2C interface
  • 5V/9.2A isolated synchronous forward converter

产品详情

The EVAL-LTC9105-AZ is an IEEE 802.3bt-compliant Type 3, Class 6 Power over Ethernet (PoE) powered device (PD) with port telemetry via I2C. The evaluation board features the LTC9105 PD interface controller, MAX5974C switching regulator controller, the LT4321 PoE ideal diode bridge controller, and the ADuM1252 I2C isolator.

The LTC9105 provides IEEE 802.3af-, IEEE 802.3at-, and IEEE 802.3bt-compliant interfacing with port voltage and current telemetry via I2C. It utilizes an external, low channel resistance, RDS(ON) (34mΩ typical), N-channel, hot-swap metal-oxide semiconductor, field-effect transistor (MOSFET), and 50mΩ sense resistor. Automatic maintain power signature (MPS) keeps the port connected when the current drops to a low level.

The MAX5974C controls a DC/DC converter utilizing a highly efficient active-clamp forward converter topology with synchronous rectification and provides an isolated 5V/9.2A output. The LT4321 controls eight low RDS(ON) (57mΩ typical), N-channel MOSFETs to further improve end-to-end power delivery efficiency and ease thermal design. The ADuM1252 isolates I2C data between the LTC9105 and a host controller on a nonisolated ground domain.

The EVAL-LTC9105-AZ is configured as a Class 6 PD and accepts up to 51W of delivered power from a power sourcing equipment (PSE) via its RJ45 connector (J1). The EVAL-LTC9105-AZ can be powered by a local 55V DC power supply using the auxiliary supply input terminals. With the DC590B I2C interface board connected to the EVAL-LTC9105-AZ, the EVAL-LTC9105-AZ graphical user interface (GUI) displays port telemetry and configuration options.
EVAL-LTC9105-AZ
EVAL-LTC9105-AZ: LTC9105, MAX5974C, LT4321, and ADuM1252 IEEE 802.3bt Powered Device with I2C Telemetry
EVAL-LTC9105-AZ Board Photo Angle View EVAL-LTC9105-AZ Board Photo Top View EVAL-LTC9105-AZ Board Photo Bottom View EA PoE PD 6

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