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參數(shù)資料
| 型號： | MAX5946LETX+T |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 16/23頁 |
| 文件大小： | 1102K |
| 描述： | IC CNTRLR PCI EXP DL 36TQFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用型，PCI Express? |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 3.3V，12V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 36-TQFN 裸露焊盤（6x6） |
| 包裝： | 帶卷 (TR) |
12V and 3.3V Outputs Normal Operation
The MAX5946 monitors and actively limits 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
current exceeds the overcurrent threshold for longer
then t
FAULT
. A fault on an auxiliary channel causes all
supplies of the affected channel to be disabled after a
programmable time period t
FAULT
(see the Fault
Management section).
Power-Good (PPWWRRGGDD__)
Power-good (PWRGD_) is an open-drain output that
pulls low a time (t
POR_HL
) after all of 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 then
V
PGTH3.3AUX
. t
POR_HL
is adjustable from 2.5ms to
1.5s by connecting a resistor from PORADJ to GND.
See the Setting the Power-On-Reset Timeout Period
(t
POR
) section.
Thermal Shutdown
When the die temperature goes above (T
SD
) +150癈, an
overtemperature fault occurs and the MAX5946 shuts
down all outputs. The device waits for the junction temper-
ature to decrease below T
SD
- Hysteresis before entering
fault management (see the Fault Management section).
Dual PCI Express, Hot-Plug
Controller
16 ______________________________________________________________________________________
V
ON_,TH
ON_, AUXON_
PWRGD_
FAULT_
12G_, 3.3G_
12VO_, 3.3VO_
3.3VAUXO_
V
PGTH12
V
PGTH3.3
V
PGTH3.3AUX
3.3AUXIN
RISING
EDGE
PWRGD_ IS PULLED UP TO 3.3.
FAULT_ IS PULLED UP TO 3.3AUXIN.
t
POR_HL
Figure 2. Power-Up Timing, No Fault
FAULT_
3.3VAUXIN
RISING
EDGE
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.
V
ON_,TH
ON_
2 x t
FAULT
PWRGD_
12G_
12V OUTPUT
CURRENT
3.3VAUXO_
V
12ILIM,TH
R
SENSE
Figure 3. 12V Power-Up Timing (Turn-On into Output
Overcurrent/Short Circuit)
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
Figure 4. 12 Output Overcurrent/Short Circuit During Normal
Operation
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