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參數資料
| 型號： | MAX5972AETE+T |
| 廠商： | Maxim Integrated |
| 文件頁數： | 10/13頁 |
| 文件大小： | 1120K |
| 描述： | IC CONTROLLER INTERFACE 16TQFN |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 以太網供電開關（PoE） |
| 應用： | IP 電話，LAN 網絡供電，網絡路由器和交換機 |
| 內部開關： | 是 |
| 電流限制： | 可調 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WQFN 裸露焊盤 |
| 供應商設備封裝： | 16-TQFN-EP（5x5） |
| 包裝： | 帶卷 (TR) |
IEEE 802.3af/at-Compliant, Powered Device Interface
Controller with Integrated Power MOSFET
10 _____________________________________________________________________________________
turns off the internal power MOSFET and 2EC current
sink. When the junction temperature falls below +112NC,
the devices enter inrush mode and then return to power
mode. Inrush mode ensures the downstream DC-DC
converter is turned off as the internal power MOSFET is
turned on.
Wall Power Adapter Detection
and Operation
For applications where an auxiliary power source such
as a wall power adapter is used to power the PD,
the MAX5972A features wall power adapter detection.
The MAX5972A gives highest priority to the WAD and
smoothly switches the power supply to WAD when it is
detected. Once the input voltage (V
DD
- V
SS
) exceeds
the mark event threshold, the MAX5972A enables wall
adapter detection. The wall power adapter is connected
from WAD to RTN. The MAX5972A detects the wall
power adapter when the voltage from WAD to RTN is
greater than 9V. When a wall power adapter is detected,
the internal n-channel isolation MOSFET turns off, 2EC
current sink turns on, and classification current is dis-
abled if V
IN
is in the classification range.
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 MAX5972A.
2) Use large SMT component pads for power dissipat-
ing devices such as the MAX5972A and the external
diodes.
3) Use short and wide traces for high-power paths.
4) Use the MAX5972A evaluation kit layout as a refer-
ence.
5) Place enough vias in the pad for the EP of the
MAX5972A so that heat generated inside can be
effectively dissipated by the PCB copper. The rec-
ommended spacing for the vias is 1mm to 1.2mm
pitch. The thermal vias should be plated (1oz cop-
per) 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
MAX5972A
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX5972AEVKIT | 制造商:Maxim Integrated Products 功能描述:IEEE 802.3AF/AT-COMPLIANT POWERED DEVICE INTERFACE CONTROLLE - Boxed Product (Development Kits) |
| MAX5972BETE+ | 功能描述:熱插拔功率分布 IEEE 802.3af/at PDIC Controller RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5972BETE+T | 功能描述:熱插拔功率分布 IEEE 802.3af/at PDIC Controller RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5973BETL+ | 功能描述:監控電路 Phase Redundancy Power Supervisor RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX5973BETL+T | 功能描述:監控電路 Phase Redundancy Power Supervisor RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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