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参数资料
| 型号： | LTC4245IG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/36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) |
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LTC4245
1
4245fa
Multiple Supply Hot Swap
Controller with I
2
C
Compatible Monitoring
The LTC
?/DIV>
4245 Hot Swap
TM
controller allows a board to
be safely inserted and removed from a live backplane in
multiple supply systems such as CompactPCI and PCI
Express. Using four external N-channel pass transistors,
the board supply voltages can be ramped up at an adjust-
able rate and in any desired sequence. An I
2
C interface and
onboard ADC allow monitoring of board current, voltage
and fault status for each supply.
The device features adjustable dI/dt controlled soft start
and foldback limited inrush current. A dual-level timed
circuit breaker and fast current limit protect each supply
against overcurrent faults. A power good input with timeout
allows a downstream supply monitor to disconnect the
board supplies. The device can be con gured to function
without a 12V supply or with an extra 3.3V supply instead
of a 5V supply.
The controller has additional features to interrupt the host
when a fault has occurred, notify when output power is
good, detect insertion of a load card and power-up in
either the on or off state.
?/DIV>
Live Board Insertion
?/DIV>
CompactPCI, CompactPCI Express, CompactTCA,
PCI Express Systems
?/DIV>
Allows Safe Insertion into Live CompactPCI
TM
or
PCI Express
TM
Backplane
?/DIV>
8-Bit ADC Monitors Current and Voltage
?/DIV>
I
2
C
TM
/SMBus Interface
?/DIV>
dI/dt Controlled Soft Start
?/DIV>
Simultaneous or Sequenced Turn-On
?/DIV>
?0V Absolute Maximum Rating for ?2V Supplies
?/DIV>
No External Gate Capacitor Required
?/DIV>
Dual-Level Circuit Breaker and Current Limit
?/DIV>
Bus Precharge Output
?/DIV>
Power Good Input with Timeout
?/DIV>
Optional Latchoff or Autoretry After Faults
?/DIV>
Alerts Host After Faults
?/DIV>
Integrated LOCAL_PCI_RST# Logic
?/DIV>
36-Pin SSOP and 38-Pin (5mm ?7mm) QFN
Packages
Sequenced Turn-On Waveform
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
V
EEIN
GND
PCI_RST#
ALERT#
SCL
SDA
HEALTHY#
BOARD
RESET
SUPPLY
MONITOR
RESET
12V
OUT
TO BUS
5V
OUT
12V
OUT
3.3V
OUT
CARD
CONNECTOR
BACKPLANE
CONNECTOR
BD_SEL#
12V
IN
3V
OUT
PRECHARGE
LOCAL_PCI_RESET#
LTC4245
PGI
ON
5V
OUT
12V
SENSE
12V
GATE
12V
OUT
5V
IN
5V
SENSE
5V
GATE
V
EESENSE
V
EEGATE
V
EEOUT
3V
IN
3V
SENSE
3V
GATE
CompactPCI Application
OUTPUT
VOLTAGE
5V/DIV
4245 TA01b
LOCAL_PCI_RST#
5V/DIV
TIME (50ms/DIV)
BD_SEL#
10V/DIV
V
EEOUT
5V
OUT
3V
OUT
12V
OUT
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