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參數(shù)資料
型號： LTC4245IUHF#PBF
廠商： Linear Technology
文件頁數(shù)： 1/36頁
文件大小： 431K
描述： IC CNTRLR HOT SWAP 38-QFN
標準包裝： 52
類型： 熱交換控制器
應(yīng)用： CompactPCI?
內(nèi)部開關(guān)： 無
電源電壓： 3.3V，5V，12V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 38-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 38-QFN（5x7）
包裝： 管件
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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