- 您现在的位置：买卖IC网 > PDF目录19716 > LTC4245IG#TRPBF (Linear Technology)IC CNTRLR HOT SWAP 36-SSOP PDF资料下载
参数资料
| 型号： | LTC4245IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/36页 |
| 文件大小： | 431K |
| 描述： | IC CNTRLR HOT SWAP 36-SSOP |
| 标准包装： | 1,000 |
| 类型： | 热交换控制器 |
| 应用： | CompactPCI? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V，12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LTC4245
20
4245fa
Power Bad Fault
A power bad condition exists when any supply output
drops below its power bad threshold for more than
15約 (17約 for V
EEOUT
). This sets bit A2 in the STATUS
register. The HEALTHY# output goes high impedance,
and LOCAL_PCI_RST# pin is pulled low. If the gate of
the supplys MOSFET is enhanced, a power bad fault is
logged in bits F0 to F3 of the FAULT2 register. A circuit
will prevent power bad fault bits being set if the external
MOSFET gate-to-source voltage is low, eliminating false
power bad faults during power-up or power-down. If the
supply output subsequently rises back above the thresh-
old, bit A2 will be cleared, HEALTHY# will pull low and
LOCAL_PCI_RST# will follow PCI_RST#.
BD_SEL# Change of State
Whenever the BD_SEL# pin toggles, bit F6 is set to indi-
cate a change of state. When the BD_SEL# pin goes high,
indicating board removal, all switches turn off immediately.
Bit A6 reports the current state of this pin. If the BD_SEL#
pin is pulled low, indicating a board insertion, all fault bits
except F6 will be cleared. If the sequence bit C6 is set, then
On control bits D1 to D3 are also cleared. If the BD_SEL#
pin remains low for 100ms the state of the ON pin will
be captured in either D0 to D3 or only D0, depending on
sequence bit C6. This turns on the switches if ON pin is
tied high. There is an internal 10糀 pull-up current source
on the BD_SEL# pin from INTV
CC
.
If the system shuts down due to a fault, it may be desirable
to restart the system simply by removing and reinserting
a load card. In cases where the LTC4245 and the switches
reside on a backplane or midplane (as in a PCI Express
application) and the load resides on a plug-in card, the
BD_SEL# pin can be used to detect when the plug-in card
is removed (see Figure 9). Once the plug-in card is rein-
serted the two fault registers are cleared (except for F6).
After 100ms the state of ON pin is latched into bits D0 to
D3. At this point the system will start up again.
If a connection sense on the plug-in card is driving the
BD_SEL# pin, the insertion or removal of the card may
cause the pin voltage to bounce. This will result in clear-
ing the fault register when the card is removed. The pin
can be debounced using a lter capacitor, C
BD_SEL#
, on
the BD_SEL# pin as shown in Figure 9. The lter time is
given by:
t
C
ms 礔
FILTER BD SEL
=
_ #
"
[ / ]
123
(5)
FET Short Fault
A FET short fault will be reported if the data converter
measures a supplys current sense voltage greater than 7
LSB while the supplys pass transistor is turned off. This
condition sets the FET short present bit, A5, and the FET
short fault bit F5. Reading the On status bits (D4 to D7) and
the ADC current sense voltage data registers (J, M, P, S)
can help debug which supplys MOSFET might be poten-
tially shorted. A false FET short fault might be reported if
an input supply power-up is delayed by more than 500ms
after INTV
CC
is up.
Fault Alerts
When any of the bits in fault registers E and F are set, an
optional bus alert can be generated by setting the appropri-
ate bit in the ALERT register B. This allows only selected
faults to generate alerts. At power-up the default state is not
to alert on faults. If an alert is enabled, the corresponding
fault will cause the ALERT# pin to pull low. See the Alert
Response Protocol section for more information.
APPLICATIO S I FOR ATIO
U
U
U
Figure 9. Plug-In Card Insertion/Removal
+
1.235V
GND
MOTHERBOARD
CONNECTOR PLUG-IN
CARD
LTC4245G*
*ADDITIONAL DETAILS OMITTED FOR CLARITY
10礎
9
BD_SEL# 10
C
BD_SEL#
4245 F09
相关PDF资料 |
PDF描述 |
|---|---|
| 190-009-163R001 | CONN DB9 MALE R/A SOLDER SMD |
| ESA43DRMN | CONN EDGECARD 86POS .125 SQ WW |
| ISPLSI 2128E-135LT176 | IC PLD ISP 128I/O 7.5NS 176TQFP |
| EMA43DRMN | CONN EDGECARD 86POS .125 SQ WW |
| MIC39150-2.5BT | IC REG LDO 2.5V 1.5A TO-220 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4245IUHF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Multiple Supply Hot Swap Controller with I2C Compatible Monitoring |
| LTC4245IUHF#PBF | 功能描述:IC CNTRLR HOT SWAP 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4245IUHF#TRPBF | 功能描述:IC CNTRLR HOT SWAP 38-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4251 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers in SOT-23 |
| LTC4251_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers in SOT-23 |
发布紧急采购，3分钟左右您将得到回复。