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LTC4242
1
4242f
Dual Slot Hot Swap
Controller for PCI Express
The LTC
?/DIV>
4242 Hot Swap
TM
 controller allows safe board
insertion and removal for two independent slots on a PCI
Express backplane. External N-channel transistors control
the 12V and 3.3V supplies while integrated switches control
the 3.3V auxiliary supplies. Both 12V and 3.3V supplies
can be ramped up at an adjustable rate. Dual level circuit
breakers and fast active current limiting protect all supplies
against overcurrent faults.
A supply  lter at the V
CC
 pin allows the LTC4242 to endure
supply transients. The EN input detects the presence of a
card in the PCI Express slot. The FAULT and AUXFAULT
outputs alert the system of overcurrent conditions on the
main and auxiliary supplies, respectively. PGOOD and
AUXPGOOD outputs indicate proper main and auxiliary
supply outputs.
?/DIV>
  PCI Express-Based PC and Servers
?/DIV>
  Hot Swap Application for Triple Supply Systems
?/DIV>
  Allows Live Insertion into PCI Express
?/DIV>
 
Backplane
?/DIV>
  Controls Two Independent PCI Express Slots
?/DIV>
  Independent Control of Main and Auxiliary Supplies
?/DIV>
  20V Rating for 12V Supply Input Pins
?/DIV>
  Integrated 0.25?SPAN class="pst LTC4242CUHF-TRPBF_2347206_7"> AUX Switches
?/DIV>
  Limits Fault Current in d1祍
?/DIV>
  Force On Test Mode
?/DIV>
  Adjustable Supply Voltage Power-Up Rate
?/DIV>
  High Side Drivers for N-Channel MOSFETs
?/DIV>
  Thermal Shutdown Protection
?/DIV>
  Available in 38-Lead QFN and 36-Lead SSOP
Packages
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
PCI Express Application
Normal Power-Up Sequence
3V
SENSE1
3V
GATE1
3V
IN1
4242 TA01a
PCIe
CONNECTOR
PLUG-IN
CARD
PCIe
CONNECTOR
PLUG-IN
CARD
3.3V
OUT
3.3V
OUT
12V
OUT
3V
OUT1
3V
OUT2
12V
SENSE1
12V
GATE1
12V
IN1
V
CC
AUXIN1
AUXOUT1
FON1
EN1
GND
EN2
FON2
3.3V
3.3V
12V
AUXOUT2
3.3V
AUXON1
ON1
FAULT1
AUXFAULT1
PGOOD1
PGOOD2
AUXFAULT2
FAULT2
ON2
AUXON2
12V
3.3V
12V
OUT1
3V
SENSE2
3V
GATE2
3V
IN2
LTC4242G
12V
SENSE2
12V
GATE2
12V
IN2
12V
OUT2
BD_PRST1
12V
OUT
3.3V
OUT
3.3V
OUT
BD_PRST2
PCI EXPRESS
HOT PLUG
CONTROLLER
AUXIN2
AUXOUTn
5V/DIV
12V
OUTn
5V/DIV
3V
OUTn
5V/DIV
PGOODn
5V/DIV
10ms/DIV
4242 F04
ENn
5V/DIV
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相关代理商/技术参数
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