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参数资料
| 型号： | LTC4280IUFD |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| 封装： | 4 X 5 MM, PLASTIC, MO-220, QFN-24 |
| 文件页数： | 8/28页 |
| 文件大小： | 286K |
| 代理商： | LTC4280IUFD |
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LTC4280
16
4280f
APPLICATIONS INFORMATION
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 LTC4280 and the switch
reside on a backplane or midplane and the load resides on
a plug-in card, the EN pin detects when the plug-in card is
removed. Figure 4 shows an example where the EN pin is
used to detect insertion. Once the plug-in card is reinserted
the fault register is cleared (except for D4). After 100ms
the state of the ON pin is latched into bit A3 of the control
register. At this point the system starts up again.
If a connection sense on the plug-in card is driving the EN
pin, insertion or removal of the card may cause the pin
voltage to bounce. This results in clearing the fault register
when the card is removed. The pin may be debounced
using a lter capacitor, CEN, on the ENpin as shown in
Figure 4. The lter time is given by:
tFILTER = CEN 123 [ms/μF]
Power Bad Fault
A power bad fault is reported if the FB pin voltage drops
below its 1.235V threshold for more than 2μs when the
GATE is high. This pulls the GPIO pin low immediately
when congured as power-good, and sets power-bad
present bit, C3, and power bad fault bit D3. A circuit
prevents power-bad faults if the gate-to-source voltage is
low, eliminating false power-bad faults during power-up
or power-down. If the FB pin voltage subsequently rises
back above the threshold, the GPIO pin returns to a high
impedance state and bit C3 is reset.
Fault Alerts
When any of the fault bits in FAULT register D are set, an
optional bus alert is generated if the appropriate bit in the
ALERT register B has been set. This allows only selected
faults to generate alerts. At power-up the default state is to
not alert on faults. If an alert is enabled, the corresponding
fault causes the ALERT pin to pull low. After the bus master
controller broadcasts the Alert Response Address, the
LTC4280 responds with its address on the SDA line and
releases ALERT as shown in Table 6. If there is a collision
between two LTC4215s responding with their addresses
simultaneously, then the device with the lower address
wins arbitration and responds rst. The ALERT line is also
released if the device is addressed by the bus master.
Once the ALERT signal has been released for one fault, it
is not pulled low again until the FAULT register indicates a
different fault has occurred or the original fault is cleared
and it occurs again. Note that this means repeated or
continuing faults do not generate alerts until the associated
FAULT register bit has been cleared.
Resetting Faults
Faults are reset with any of the following conditions. First,
a serial bus command writing zeros to the FAULT register
D clears the associated faults. Second, the entire FAULT
register is cleared when the switch is turned off by the ON
–
+
1.235V
GND
MOTHERBOARD
CONNECTOR
PLUG-IN
CARD
SOURCE
OUT
LTC4280
EN
CEN
LOAD
4280 F04
10μA
Figure 4. Plug-In Card Insertion/Removal
FET Short Fault
A FET short fault is reported if the data converter measures
a current sense voltage greater than or equal to 1.6mV
while the GATE is turned off. This condition sets FET short
present bit, C5, and FET short fault bit D5.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4280IUFD#PBF | 功能描述:IC HOT SWAP CONTROLLER 24-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) |
| LTC4280IUFD#TRPBF | 功能描述:IC CTLR HOT SWAP I2C MON 24QFN 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) |
| LTC4280IUFD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
| LTC4280IUFD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
| LTC4280IUFD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
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