MAX5946LETX+T【PDF 12/23 页】IC CNTRLR PCI EXP DL 36TQFN

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录43

8页 9页 10页 11页 [12页]13页 14页 15页 16页

Dual PCI Express, Hot-Plug

Controller

12 ______________________________________________________________________________________

NAME

FUNCTION

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).

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).

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).

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.

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.

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.

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.

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.

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.

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

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.

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.

3.3VAUXOA Slot A 3.3V Auxiliary Power-Supply Output

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.

3.3VAUXOB Slot B 3.3V Auxiliary Power Output

PWRGDB

Slot B Power-Good Output. See PWRGDA function.

FAULTB

Slot B Open-Drain Fault Output. See FAULTA function.

3.3GB

Slot B 3.3V Gate-Drive Output. See 3.3GA function.

Pin Description

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式