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參數(shù)資料
| 型號： | MAX5954LETX+T |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 1027K |
| 描述： | IC PCI EXP/HOT-PLUG CTRLR 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 |
| 供應商設備封裝： | 36-TQFN 裸露焊盤（6x6） |
| 包裝： | 帶卷 (TR) |
Single PCI Express, Hot-Plug
Controller
12 ______________________________________________________________________________________
PIN
NAME
FUNCTION
1
PRES-DET
Present-Detect Input. PRES-DET accepts inputs from the PRSNT#2 pin on a PCI-E connector. PRES-DET
has an internal pullup to 3.3VAUXIN. When PRES-DET is low, the outputs follow the command from ON
and AUXON after a 4ms debounced time. When PRES-DET goes from low to high, all outputs of the
respective slot shut down with no delay (see Table 2).
2
FON
Forced-On Input. FON has a 50k& internal pullup to 3.3VAUXIN. A logic-low on FON turns on all PCI-E
outputs as long as the power inputs are within their operating range, regardless of the status of the other
input signals. Leave FON open for normal operation (see Table 2).
3
ON
12V and 3.3V Outputs Enable. A logic-high at ON turns on the 12V and 3.3V outputs (see Table 2).
4
AUXON
. V A xili r
En l . A l i -hi h A X N rn n h
xili r
. VA X
T l 2 .
5
12S+
12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to 12S+
using the Kelvin-sensing technique to assure accurate current sensing.
6
12S-
12V Negative Current-Sense Input. Connect 12S- to the negative side of the current-sense resistor using
the Kelvin-sensing technique to assure accurate current sensing.
7
12G
12V Gate-Drive Output. Connect 12G to the gate of the 12V MOSFET. At power-up, V
12G
is raised to the internal charge-pump voltage level by a constant current.
8
3.3S+
3.3V Positive Current-Sense Input. Connect the positive side of the current-sense resistor to 3.3S+ using
the Kelvin-sensing technique to assure accurate current sensing. This input is also used for the 3.3V
supplys UVLO function.
9
3.3S-
3.3V Negative Current-Sense Input. Connect to the negative side of the sense resistor using the Kelvin-
sensing technique to assure accurate current sensing.
10
3.3G
3.3V Gate- D r i ve O utp ut. C onnect 3.3G to the g
ate of the 3.3V M O S FE T. At p ow er - up , V
3 .3 G
i s char g ed to 5.5V
ab ove the 3.3V sup p
l y b y a constant cur r
ent d er i ved fr om V
1 2V IN
.
11
FAULT
Open-Drain Fault Output Signal. FAULT latches active low whenever the outputs are shut down
due to a fault. A fault is either of:
" An overcurrent condition lasting longer than the overcurrent timeout.
" A device over temperature condition.
If the fault is detected in the main outputs, FAULT must be reset by toggling the ON input. If the fault is in
the auxiliary output, FAULT must be reset by toggling both ON and AUXON. For the auto-restart version,
FAULT is reset when the part initiates the next power-on cycle.
12
PWRGD
Open-Drain Power-Good Output. PWRGD goes low t
POR_HL
after all outputs reach their final value and
the power MOSFETs are fully enhanced.
13
3.3VAUXO 3.3V Auxiliary Power-Supply Output
14
3.3VAUXIN
3.3V Auxiliary Supply Input. 3.3VAUXIN is the input to a charge pump that drives the internal MOSFET
connecting 3.3VAUXIN to 3.3VAUXO. V
3.3VAUXIN
is also used to power the internal control logic and
analog references of the MAX5954.
1523,
26, 27,
2
N.C.
No Connection. Not internally connected.
24
T1
Test Input. Connect T1 to GND.
Pin Description
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