收藏本站
Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
___________Applications Information
Layout Procedure
Careful PCB layout is critical to achieve high efficiency
and low EMI. Follow these layout guidelines for optimal
performance:
1) Place the high-frequency input bypass capacitor (0.1 F F
ceramic capacitor from AGND to V EE ) and the output
bypass capacitors (0.1 F F ceramic capacitors from
AGND to OUT_) as close to the device as possible.
2) Use large SMT component pads for power dissipat-
ing devices such as the MAX5980 and the external
MOSFETs and sense resistors in the high-power path.
3) For the best accuracy current sensing, use Kelvin-
sense techniques for the SENSE_ and SVEE_ inputs
in the PCB layout. The device provides individual
high-side SENSE_ inputs for each port, and two sepa-
rate shared low-side sense returns, SVEE1 (ports 1
and 2 low-side sense input) and SVEE2 (ports 3 and
4 low-side sense input). The high-side sensing should
be done from the end of the high-side sense resistor
pad, and the SVEE_ pairs should be routed from the
end of the low-side sense resistor pads. To minimize
the impact from additional series resistance, the two
end points should be as close as possible, and sense
trace length should be minimized (see Figure 14 for a
layout diagram, and refer to the MAX5980 Evaluation
Kit for a design example).
4) Use short, wide traces whenever possible for high-
power paths.
5) Use the MAX5980 Evaluation Kit as a design and
layout reference.
6) The exposed pad (EP) must be soldered evenly to
the PCB ground plane (V EE ) for proper operation
and power dissipation. Use multiple vias beneath
the exposed pad for maximum heat dissipation. A
1.0mm to 1.2mm pitch is the recommended spacing
for these vias and they should be plated (1oz copper)
with a small barrel diameter (0.30mm to 0.33mm).
R SENSE2
R SENSE1
PORT
CURRENT
PATH
VIAS TO V EE
PORT
CURRENT
PATH
R SENSE3
R SENSE4
SENSE1
SENSE2
SVEE1
SVEE2
SENSE3
SENSE4
KELVIN-SENSE TRACES TO HIGH-SIDE/LOW-SIDE SENSE INPUTS
Figure 14. Kelvin-Sense Layout Diagram
47
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
MAX5982CEVKIT# EVAL KIT MAX5982C
MAX6397SATA+T IC SW OVERVOLT PROT 8-TDFN
MAX6496EVKIT+ KIT EVAL FOR MAX6496
MAX6651EVKIT EVAL KIT FOR MAX6651
MAX7325EVKIT+ KIT EVAL FOR MAX7325
MAX7326EVKIT+ KIT EVAL FOR MAX7326
MAX7359EVKIT+ KIT EVAL FOR MAX7359
MAX7443EVKIT+ KIT EVAL FOR MAX7443
相关代理商/技术参数
MAX5980EVKIT+ 功能描述:电源开关 IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6
MAX5980GTJ+ 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6
MAX5980GTJ+T 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6
MAX5980UTJ+ 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6
MAX5980UTJ+T 功能描述:电源开关 IC - POE / LAN 0-16V Hot-Swap Controller RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6
MAX5981AETE+ 功能描述:热插拔功率分布 IEEE 802.3af/at PDIC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5981AETE+T 功能描述:热插拔功率分布 IEEE 802.3af/at PDIC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube
MAX5981AEVKIT# 制造商:Maxim Integrated Products 功能描述:EVKIT FOR POWERED DEVICE INTERFACE CONTROLLERS WITH INTEGRAT - Boxed Product (Development Kits) 制造商:Maxim Integrated Products 功能描述:KIT EVAL INTERFACE CONTROLLER