系统板 MAXREFDES1009

MAXREFDES1009:IEEE 802.3af/at兼容、PD接口,带有3个超小尺寸、高效、同步DC-DC Buck转换器


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Input Type VIN (MIN)
(V)
VIN (MAX)
(V)
IOUT
(A)
Single/Multiple
Output
VOUT
(V)
POUT
(W)
Topology
DC 37 57 0.3 to 1 Multiple 5 to 12 12.95 to 25.5 Synchronous Buck

Power over Ethernet (PoE) is a technology that allows network cables to deliver power to a powered device (PD) via power-sourcing equipment (PSE) or midspan, and has many advantages over traditional methods of delivering power.

PoE allows power and data to be combined, removing the need for altering the AC mains infrastructure and can be installed by non-electricians. PoE is an intelligent system designed with protection at the forefront, preventing overload, underpowering, and installation errors, while allowing simple scalability and reliability.

High-efficiency, step-down switching regulators minimize power loss with efficiencies greater than 90%, allowing reductions in excessive heat, longer lifetime of ICs, and maximum power available to the PD. Ultra-small packaging, no Schottky diode, and the use of all ceramic capacitors reduce the overall size of the design.

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Key Features

  • IEEE 802.3af/at Compliance
  • 2-Event Classification
  • No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
  • Internal Compensation and Feedback Divider for 5V Fixed Output Saves Space
  • All-Ceramic Capacitors, Ultra-Compact Layout
  • Peak Efficiency > 90%
  • 3mm × 2mm, 10-Pin TDFN and 5mm × 4.4mm, 14-Pin TSSOP Packages (MAX17502)
  • Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN (MAX5969B)

Designed, Built, Tested

This document describes the hardware shown in Figure 1. It provides a detailed technical guide to designing a complete interface for a PD to comply with the IEEE® 802.3af/at standard in a power-over-Ethernet (PoE+/Type II) Class 4 system and provides a 3-output, non-isolated, ultra-small, high-efficiency, synchronous, step-down DC-DC conversion.

Design Resources

 
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Temperature:

MAX17502
60V、1A、超小尺寸、高效率、同步降压DC-DC转换器

  • 无需外部元件,降低总体成本
  • 减少DC-DC稳压器库存清单
  • 降低功耗