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參數(shù)資料
| 型號： | MAX5916 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125 |
| 中文描述： | 雙路PCI 2.2熱插拔控制器 |
| 文件頁數(shù)： | 12/25頁 |
| 文件大小： | 579K |
| 代理商： | MAX5916 |
M
Detailed Description
The MAX5915/MAX5915A/MAX5916/MAX5916A are cir-
cuit-breaker ICs for hot-swap applications where a PCI
card is inserted into a slot that is connected to a live
backplane. Normally, when a card is plugged into a live
backplane, the card
’
s discharged capacitors provide a
low-impedance path that can momentarily cause the
main power supply to collapse. Both devices provide
startup current limiting and undervoltage/overcurrent
monitoring of two separate PCI card slots. Current limit-
ing and short-circuit protection are achieved using
external n-channel MOSFETs on the +3.3V and +5V
supply lines and internal MOSFETs on the
±
12V and
+3.3V auxiliary supply lines.
External sense resistors monitor the output currents of
the +3.3V and +5V supplies. These external sense
resistors adjust the overcurrent trip threshold. PCI stan-
dards dictate maximum values for the supply power
and total power drawn from the backplane. The maxi-
mum power that any one PCI board can draw is 25W.
Table 1 lists PCI standard maximum voltage, current,
and power for each supply.
Table 1 illustrates that both the +5V and +3.3V supplies
can draw up to 25W. Total combination of output power
should be limited to 25W based on PCI standard.
Startup Mode
The +12V input powers the internal circuitry of these
devices. The main supply outputs (3.3VO_, 5VO_,
+12VO_, and -12VO_) can become active only after
both of the following events have occurred:
V
+12VIN
is above its undervoltage lockout (UVLO)
threshold.
ON_ is driven high.
Figure 1 displays typical startup waveforms. The main
supplies can be enabled without using the auxiliary
supply; however, PGOOD_ remains in a low state if the
auxiliary supply is not used.
The auxiliary supply (3.3VAUXO_) is available after both
of these events have occurred:
V
3.3VAUXIN
is above its UVLO threshold.
AUXON_ is driven high.
Normal Operation +3.3V, +5V,
±
12V Outputs
The internal circuitry for these devices monitors the out-
put voltage on all channels except the -12V supply. All
outputs are monitored for overcurrent. An undervoltage
condition occurs when any supply
’
s output voltage falls
below the set undervoltage level. An overcurrent fault
occurs when a monitored output current reaches the
set overcurrent threshold. Each supply has its own
overcurrent and undervoltage thresholds. If any of the
monitored voltages fall below their respective under-
voltage level, or if any of the monitored output currents
reach their overcurrent threshold, for a time period,
t
DELAY
, the controller disables the channel with the fault
condition (see the
Fault Management
section).
External sense resistors monitor current through the
external MOSFETs of the +3.3V and +5V outputs, while
the current for the
±
12V supplies are internally monitored.
A fault condition on one of the main outputs causes all
the channel
’
s main outputs to shut down after t
DELAY
and then either latch off (MAX5915/MAX5915A) or auto-
matically restart after t
RESTART
(MAX5916/MAX5916A).
A fault on any of the channel
’
s main outputs
does not
affect the channel
’
s auxiliary outputs.
Normal Operation +3.3V Auxiliary Output
Auxiliary output voltage and current are monitored inter-
nally. The +3.3V auxiliary output is
independent
of the
main outputs but the main outputs are
dependent
on
the auxiliary outputs. Fault conditions on the main out-
puts do not affect the auxiliary. A fault on the auxiliary
supply causes the controller to disable all of the affected
Dual PCI 2.2 Hot-Swap Controllers
12
______________________________________________________________________________________
Table 1. PCI Standard Maximum Values
SUPPLY VOLTAGE (V)*
VOLTAGE TOLERANCE (%)
MAX CURRENT (A)
MAX POWER (W)
+5
±
5
5
25
+3.3
±
0.3V
7.6
25
+12
±
5
0.5
6
-12
±
10
0.1
1.2
+3.3 aux (enabled)
±
10
0.375
1.24
+3.3 aux (disabled)
±
10
0.02
0.066
*
Supply voltage is referenced to the output of the MAX5915/MAX5916.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5916A | Dual PCI 2.2 Hot-Swap Controllers |
| MAX5916AEUI | Dual PCI 2.2 Hot-Swap Controllers |
| MAX5916EUI | Dual PCI 2.2 Hot-Swap Controllers |
| MAX5917BESE | +65V Simple Swapper Hot-Swap Switches |
| MAX5910 | +65V Simple Swapper Hot-Swap Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5916AEUI | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5916AEUI+ | 功能描述:熱插拔功率分布 Dual PCI 2.2 Hot Swap 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5916AEUI+T | 功能描述:熱插拔功率分布 Dual PCI 2.2 Hot Swap 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5916AEUI-T | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5916AUUI+ | 功能描述:熱插拔功率分布 Dual PCI 2.2 Hot Swap 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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