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参数资料
| 型号： | MAX5945EAX+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/44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： | 30 |
| 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： | -40°C ~ 85°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： | 管件 |
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ther extend the programming range of these timers and
also increase the programming resolution.
When the MAX5945 shuts down a port due to an
extended overcurrent condition (either during startup or
normal operation), if RSRT_EN is set high, then the part
does not allow the port to power back on before the
restart timer (Table 19a) returns to zero. This effectively
sets a minimum duty cycle that protects the external
MOSFET from overheating during prolonged output
overcurrent conditions.
A reset sets R16h = 00h.
Setting CL_DISC to 1 (Table 20) enables port-over-
class current protection, where the MAX5945 scales
down the overcurrent limit (VFLT_LIM) according to the
port classification status. This feature provides protec-
tion to the system against PDs that violate their maxi-
mum class current allowance.
A reset sets R17h = 0xC0.
Power-enable pushbutton (Table 21) for SEMI and
MANUAL modes. Setting PWR_ON_ to 1 turns on
power to the corresponding port. Setting PWR_OFF_ to
1 turns off power to the port. PWR_ON_ is ignored
MAX5945
Quad Network Power Controller
for Power-Over-LAN
______________________________________________________________________________________
29
ADDRESS = 15h
SYMBOL
BIT
R/W
DESCRIPTION
Reserved
7
R
Reserved
6
R
Reserved
5
R
Reserved
4
R
Reserved
BCKOFF4
3
R/W
Enable Cadence timing on port 4
BCKOFF3
2
R/W
Enable Cadence timing on port 3
BCKOFF2
1
R/W
Enable Cadence timing on port 2
BCKOFF1
0
R/W
Enable Cadence timing on port 1
Table 18. Backoff Enable Register
ADDRESS = 16h
SYMBOL
BIT
R/W
DESCRIPTION
RSTR[1]
7
R/W
Restart timer programming bit 1
RSTR[0]
6
R/W
Restart timer programming bit 0
TSTART[1]
5
R/W
Startup timer programming bit 1
TSTART[0]
4
R/W
Startup timer programming bit 0
TFAULT[1]
3
R/W
Overcurrent timer programming bit 1
TFAULT[0]
2
R/W
Overcurrent timer programming bit 0
TDISC[1]
1
R/W
Load disconnect timer programming bit 1
TDISC[0]
0
R/W
Load disconnect timer programming bit 0
Table 19. Timing Register
BIT [1:0]
RSTR
tDISC
tSTART
tFAULT
00
16 x tFAULT
tDISC nominal
(350ms, typ)
tSTART nominal
(60ms, typ)
tFAULT nominal
(60ms, typ)
01
32 x tFAULT
1/4 x tDISC nominal
1/2 x tSTART nominal
1/2 x tFAULT nominal
10
64 x tFAULT
1/2 x tDISC nominal
2 x tSTART nominal
2 x tFAULT nominal
11
0 x tFAULT
2 x tDISC nominal
4 x tSTART nominal
4 x tFAULT nominal
Table 19a. Startup, Fault, and Load Disconnect Timers with Default Values in the
Register 27h and 28h
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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 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 |
| MAX5945EVSYS | 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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