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參數(shù)資料
| 型號： | MAX5946LETX+T |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 12/23頁 |
| 文件大?。?/td> | 1102K |
| 描述： | IC CNTRLR PCI EXP DL 36TQFN |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)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) |
Dual PCI Express, Hot-Plug
Controller
12 ______________________________________________________________________________________
PIN
NAME
FUNCTION
1
PRES-DETA
Present-Detect Input A. PRES-DETA accepts inputs from the PRSNT#2 pin on a PCI express connector.
PRES-DETA has an internal pullup to 3.3VAUXIN. When PRES-DETA is low, the outputs follow the
command from ONA and AUXONA after a 4ms debounced time. When PRES-DETA goes from low to
high, all outputs of the respective slot shut down with no delay (see Table 2).
2
FONA
Forced-On Input A. FONA has a 50k& internal pullup to 3.3VAUXIN. A logic-low on FONA turns on all
slot A outputs as long as the power inputs are within their operating range, regardless of the status of
the other input signals. Leave FONA open for normal operation (see Table 2).
3
ONA
Slot A 12V And 3.3V Outputs Enable. A logic-high at ONA turns on the 12V and 3.3V outputs of slot A
(see Table 2).
4
AUXONA
Slot A 3.3V Auxiliary Output Enable. A logic-high at AUXONA turns on the slot A auxiliary output
(3.3VAUXOA), see Table 2.
5
12SA+
Slot A 12V Positive Current-Sense Input. Connect the positive terminal of the current-sense resistor to
12SA+ using the Kelvin-sensing technique to assure accurate current sensing.
6
12SA-
Slot A 12V Negative Current-Sense Input. Connect 12SA- to the negative side of the current-sense
resistor using the Kelvin-sensing technique to assure accurate current sensing.
7
12GA
Slot A 12V Gate-Drive Output. Connect 12GA to the gate of slot As 12V MOSFET. At power-up, V
12GA
is raised to the internal charge-pump voltage level by a constant current.
8
3.3SA+
Slot A 3.3V Positive Current-Sense Input. Connect the positive side of the current-sense resistor to
3.3SA+ using the Kelvin-sensing technique to assure accurate current sensing. This input is also used
for the 3.3V supplys UVLO function.
9
3.3SA-
Slot A 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
3.3GA
S l ot A 3.3V G ate- D r i ve O utp ut. C onnect 3.3G A to the g ate of sl ot A s 3.3V M OS FE T. At p ow er
- up , V
3 .3 GA
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
FAULTA
Open-Drain Fault Output Signal. FAULTA latches active low whenever the slot A 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, FAULTA must be reset by toggling the ONA input. If the fault
is in the auxiliary output, FAULTA must be reset by toggling both ONA and AUXONA. For the auto-
restart version, FAULTA is reset when the part initiates the next power-on cycle.
12
PWRGDA
Open-Drain Power-Good Output. PWRGDA goes low t
POR_HL
after all outputs of slot A reach their final
value and the power MOSFETs are fully enhanced.
13
3.3VAUXOA Slot A 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 MOSFETs
connecting 3.3VAUXIN to 3.3VAUXOA and 3.3VAUXOB. V
3.3VAUXIN
is also used to power the internal
control logic and analog references of the MAX5946.
15
3.3VAUXOB Slot B 3.3V Auxiliary Power Output
16
PWRGDB
Slot B Power-Good Output. See PWRGDA function.
17
FAULTB
Slot B Open-Drain Fault Output. See FAULTA function.
18
3.3GB
Slot B 3.3V Gate-Drive Output. See 3.3GA function.
Pin Description
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