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參數(shù)資料
| 型號： | MAX5915A |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Dual PCI 2.2 Hot-Swap Controllers |
| 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： | 657K |
| 代理商： | MAX5915A |
M
Detailed Description
The MAX5915/MAX5916 are circuit-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 sup-
ply to collapse. Both devices provide startup current
limiting and undervoltage/overcurrent monitoring of two
separate PCI card slots. Current limiting and short-cir-
cuit protection are achieved using external N-channel
MOSFETs on the +3.3V and +5V supply lines and inter-
nal 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 the
MAX5915/MAX5916. 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 the MAX5915/MAX5916 moni-
tors the output voltage on all channels except the -12V
supply. All outputs are monitored for overcurrent. An
undervoltage condition occurs when any supply
’
s out-
put voltage falls below the set undervoltage level. An
overcurrent fault occurs when a monitored output cur-
rent reaches the set overcurrent threshold. Each supply
has its own overcurrent and undervoltage thresholds. If
any of the monitored voltages fall below their respective
undervoltage 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 moni-
tored. 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) or
automatically restart after t
RESTART
(MAX5916). 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 dis-
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.
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|---|---|
| MAX5915AEUI | 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 |
| MAX5915AEUI+ | 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5915AEUI+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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5915AEUI-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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5915AUUI+ | 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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