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参数资料
| 型号： | MAX5957LETN+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/25页 |
| 文件大小： | 634K |
| 描述： | IC TRPL PCI EXP/HOT-PLUG 56-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | 通用型，PCI Express? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-WFQFN 裸露焊盘 |
| 供应商设备封装： | 56-TQFN-EP（7x7） |
| 包装： | 带卷 (TR) |
Triple PCI Express, Hot-Plug Controllers
______________________________________________________________________________________ 17
12V and 3.3V Outputs Normal Operation
The MAX5957/MAX5958 monitor and actively limit the
current of the 12V and 3.3V outputs after the startup
period. Each output has its own overcurrent threshold.
If any of the monitored output currents rise above the
overcurrent threshold for a period t
FAULT
, FAULT_
asserts and the controller disengages both the 12V and
3.3V outputs for the particular slot (see the Fault
Management section).
3.3V Auxiliary Output Normal Operation
The auxiliary output current is internally monitored and
actively limited to the maximum current-limit value. An
overcurrent fault condition occurs when the output cur-
rent exceeds the overcurrent threshold for longer than
t
FAULT
. A fault on an auxiliary channel causes all sup-
plies of the affected channel to be disabled after a pro-
grammable time period t
FAULT
.
A fault condition on a main channel (V
12VIN
or V
3.3VIN
)
causes all the channels main outputs to shut down
after the t
FAULT
period and then either latch off or auto-
matically restart after the t
RESTART
(t
RESTART
= 64 x
t
FAUALT
) period, depending on the device version. A
fault on any of the channels main outputs does not
affect the auxiliary channel (V
3.3AUXIN
).
Power-Good (PWRGD_)
Power-good (PWRGD_) is an open-drain output that
pulls low a time (t
POR_HL
) after all the outputs of the
respective slot are fully on. All outputs are considered
fully on when 3.3G_ has risen to V
PGTH3.3
, 12G_ has
risen to V
PGTH12
, and V
3.3AUXO_
is less than
V
PGTH3.3AUX
. t
POR_HL
is adjustable from 2.4ms to 1.5s
by connecting a resistor from PORADJ to GND. See the
Setting the Power-On Reset and Timeout Period
(t
POR_HL
) sections. Connect PORADJ to GND to com-
pletely skip the POR time delay for PWRGD_ assertion.
Thermal Shutdown
When the die temperature goes above (T
SD
) +150癈, an
overtemperature fault occurs and the MAX5957/
MAX5958 shut down all outputs. The devices wait for the
junction temperature to decrease below T
SD
- hysteresis
before entering fault management (see the Fault
Management section).
Fault Management
A fault occurs when an overcurrent or 12G_ or 3.3G_
below the power-good threshold lasts longer than
t
FAULT
or when the device experiences an overtemper-
ature condition:
" A fault on a main output (12V or 3.3V) shuts down
both main outputs of the respective slot. The 3.3V
auxiliary is not affected.
" A fault on the 3.3V auxiliary output shuts down all
three outputs of the respective slot.
The MAX5957A/MAX5958A automatically restart from a
fault shutdown after the t
RESTART
period while the
MAX5957L/MAX5958L latch off. If an overcurrent fault
occurred on a main output, bring ON_ low for at least
t
RESET
(100祍) and high again to reset the fault and
restart the outputs. If the overcurrent fault occurred on
an auxiliary output or an overtemperature fault
occurred, bring both ON_ and AUXON_ low for a mini-
mum of t
RESET
to reset the fault. Toggle ON_ or only
AUXON_ to reset the fault condition. If ON_ and
AUXON are toggled before t
RESTART
time counting has
elapsed, the MAX5957L/MAX5958L store the informa-
tion and restart when the delay is finished. The
MAX5957A/MAX5958A (autoretry versions) restart all
channels automatically after t
RESTART
.
Figure 4. 12 Output Overcurrent/Short Circuit During Normal
Operation
FAULT_
PWRGD_ IS PULLED UP TO 3.3VAUXO_.
FAULT_ IS PULLED UP TO 3.3VAUXIN.
A FAULT ON THE 3.3V OUTPUT OR 3.3VAUXO_ OUTPUT PRODUCES SIMILAR RESULTS.
t
FAULT
PWRGD_
12G_
12V OUTPUT
CURRENT
V
12ILIM,TH
R
SENSE
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|---|---|
| MAX5958AETN+ | 功能描述:热插拔功率分布 Triple PCIe Hot Plug 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 |
| MAX5958AETN+T | 功能描述:热插拔功率分布 Triple PCIe Hot Plug 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 |
| MAX5958LETN+ | 功能描述:热插拔功率分布 Triple PCIe Hot Plug 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 |
| MAX5958LETN+T | 功能描述:热插拔功率分布 Triple PCIe Hot Plug 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 |
| MAX5959AECS+ | 功能描述:热插拔功率分布 Triple PCIe Hot Plug 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 |
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