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IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated Power MOSFET
______________________________________________________________________________________ 13
  Applications Information
Operation with 12V Adapter
Layout Procedure
Careful PCB layout is critical to achieve high efficiency
and low EMI. Follow these layout guidelines for optimum
performance:
1) Place the input capacitor, classification resistor, and
transient voltage suppressor as close as possible to
the MAX5981A/MAX5981B.
2) Use large SMT component pads for power dissipat-
ing devices such as the MAX5981A/MAX5981B and
the external diodes.
3) Use short and wide traces for high-power paths.
4) Use the MAX5981A/MAX5981B evaluation kit layout
as a reference.
5) Place enough vias in the pad for the EP of the
MAX5981A/MAX5981B so that heat generated inside
can be effectively dissipated by the PCB copper.
The recommended spacing for the vias is 1mm to
1.2mm pitch. The thermal vias should be plated (1oz
copper) and have a small barrel diameter (0.3mm to
0.33mm).
Figure 2. Typical Configuration When Using a 12V Wall Power Adapter
68nF
2-EVENT
CLASSIFICATION
(ASSERTED ON)
ENABLE
DC-DC
CONVERTER
IN+
IN-
RJ-45
AND
BRIDGE
RECTIFIER
GND
GND
-54V
SMAJ58A
MAX5981A
MAX5981B
R
DET
24.9kI
R
CLS
V
DD
V
SS
RTN
WAD
PG
DET
CLS
2EC/WAD
2EC
12V
BATTERY
1.5mA
THIS CIRCUIT ACHIEVES
PROPER 2EC LOGIC WHEN
BATTERY IS < 12.5V
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MAX5982AEVKIT# 制造商:Maxim Integrated Products 功能描述:PD INTERFACE CONTROLLER FOR HIGH POWER UP TO 70W APPLICATION - Boxed Product (Development Kits) 制造商:Maxim Integrated Products 功能描述:KIT EVAL FOR MAX5982A
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MAX5982BETE+T 功能描述:热插拔功率分布 PDIC, up to 70W 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
MAX5982CETE+ 功能描述:热插拔功率分布 PDIC, up to 70W 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
MAX5982CETE+T 功能描述:热插拔功率分布 PDIC, up to 70W 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