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参数资料
| 型号： | MAX5945CAX+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/44页 |
| 文件大小： | 0K |
| 描述： | IC NETWORK PWR CTRL 36-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 控制器类型： | 网络电源控制器 |
| 接口： | I²C |
| 电源电压： | 3.3V |
| 电流 - 电源： | 4.2mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
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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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5945EAX | 功能描述:热插拔功率分布 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 |
| MAX5945EAX+ | 功能描述:热插拔功率分布 IEEE 802.3af Quad Net Pwr 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 |
| MAX5945EAX+T | 功能描述:热插拔功率分布 IEEE 802.3af Quad Net Pwr 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 |
| MAX5945EAX-T | 功能描述:热插拔功率分布 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 |
| MAX5945EVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit/Evaluation System for the MAX5945 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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