When the part enters" />
參數(shù)資料
型號(hào)： MAX5945EAX+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 7/44頁(yè)
文件大?。?/td> 0K
描述： IC NETWORK PWR CTRL 36-SSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 1,000
控制器類(lèi)型： 網(wǎng)絡(luò)電源控制器
接口： I²C
電源電壓： 3.3V
電流 - 電源： 4.2mA
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 36-BSOP（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 36-SSOP
包裝： 帶卷 (TR)
Table 2 shows the IEEE 802.3af requirement for a PSE
classifying a PD at the power interface (PI).
Powered State
When the part enters PWR MODE, the tSTART and tDISC
timers are reset. Before turning on the power, the part
checks if any other port is not turning on and if the
tFAULT timer is zero. Another check is performed if the
ACD_EN bit is set, in this case OSC_FAIL bit must be
low (oscillator is okay) for the port to be powered.
If these conditions are met then the part enters startup
where it turns on power to the port. An internal signal,
POK_, is asserted high when VOUT is within 2V from
VEE. PGOOD_ status bits are set high if POK_ stays
high longer than tPGOOD. PGOOD immediately resets
when POK goes low.
The PWR_CHG bit sets when a port powers up or down.
PWR_EN sets when a port powers up and resets when a
port shuts down. The port shutdown timer lasts 0.5ms
and prevents other ports from turning off during that peri-
od, except in the case of emergency shutdowns (RESET
= L, RESET_IC = H, VEEUVLO, VDDUVLO, and TSHD).
The MAX5945 always checks the status of all ports before
turning off. A priority logic system determines the order to
prevent the simultaneous turn-on or turn-off of the ports.
The port with the lesser ordinal number gets priority over
the others (i.e., port 1 turns on first, port 2 second, port 3
third and port 4 fourth). Setting PWR_OFF_ high turns off
power to the corresponding port.
MAX5945
Quad Network Power Controller
for Power-Over-LAN
______________________________________________________________________________________
15
PARAMETER
SYMBOL
MIN
MAX
UNITS
ADDITIONAL INFORMATION
Open-Circuit Voltage
VOC
—
30
V
In detection mode only
Short-Circuit Current
ISC
—
5
mA
In detection mode only
Valid Test Voltage
VVALID
2.8
10
V
Voltage Difference Between
Test Points
VTEST
1—
V
Time Between Any Two Test
Points
tBP
2
—
ms
This timing implies a 500Hz maximum probing frequency
Slew Rate
VSLEW
—
0.1
V/s
Accept Signature Resistance
RGOOD
19
26.5
k
Reject Signature Resistance
RBAD
< 15
> 33
k
Open-Circuit Resistance
ROPEN
500
—k
Accept Signature
Capacitance
CGOOD
—
150
nF
Reject Signature
Capacitance
CBAD
10
—
F
Signature Offset Voltage
Tolerance
VOS
0
2.0
V
Signature Offset Current
Tolerance
IOS
012
A
Table 1. PSE PI Detection Modes Electrical Requirement
(Table 33-2 of the IEEE 802.3af Standard)
MEASURED ICLASS (mA)
CLASSIFICATION
0 to 5
Class 0
> 5 and < 8
May be Class 0 and 1
8 to 13
Class 1
> 13 and < 16
May be Class 0, 1, or 2
16 to 21
Class 2
> 21 and < 25
May be Class 0, 2, or 3
25 to 31
Class 3
> 31 and <35
May be Class 0, 3, or 4
35 to 45
Class 4
> 45 and < 51
May be Class 0 or 4
Table 2. PSE Classification of a PD
(Table 33-4 of the IEEE 802.3af Standard)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5945EVKIT 功能描述:電源管理IC開(kāi)發(fā)工具 Evaluation Kit/Evaluation System for the MAX5945 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
MAX5945EVSYS 功能描述:電源管理IC開(kāi)發(fā)工具 Evaluation Kit/Evaluation System for the MAX5945 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
MAX5946AETJ 制造商:Maxim Integrated Products 功能描述:DUAL PCI-EXPRESS HOT-PLUG CONTROLLER - Rail/Tube
MAX5946AETX 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
MAX5946AETX+ 功能描述:熱插拔功率分布 Dual PCIe Hot-Plug Controller RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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