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LTC1643L Datasheet, PDF (1/16 Pages) Linear Technology – PCI-Bus Hot Swap Controller | |||
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LTC1643L/LTC1643L-1/LTC1643H
PCI-Bus Hot Swap
Controller
FEATURES
s Allows Safe Board Insertion and Removal from a
Live PCI Slot
s Works on either a Motherboard (LTC1643H) or
CompactPCITM Card (LTC1643L/LTC1643L-1)
s Controls â12V, 3.3V, 5V, 12V Supplies
s Programmable Foldback Current Limit with
Circuit Breaker
s User-Programmable Supply Voltage Power-Up Rate
s High Side Drive for External N-Channels
s â12V and 12V On-Chip Switches
s Fault and Power-Good Outputs
U
APPLICATIO S
s PCI-Based Servers
s CompactPCI Compliant Boards
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
CompactPCI is a trademark of PCI Industrial Computer Manufacturing Group.
DESCRIPTIO
The LTC®1643 is a Hot SwapTM controller that allows a board
to be safely inserted and removed from a live PCI-Bus slot.
Two external N-channel transistors control the 3.3V and 5V
supplies while on-chip switches control the â12V and 12V
supplies. All supply voltages can be ramped up at a program-
mable rate. An electronic circuit breaker protects all four
supplies against overcurrent faults. The foldback current limit
feature limits current spikes and power dissipation when
shorts occur and allows boards with large capacitances to be
powered up without tripping the circuit breaker. The PWRGD
output indicates when all of the supply voltages are within
tolerance and the FAULT output indicates an overcurrent
condition. The ON(LTC1643H)/ON (LTC1643L/LTC1643L-1)
pin is used to cycle the board power or reset the circuit
breaker. The LTC1643L-1 has the ±12V power good com-
parators disabled.
The LTC1643 is available in a 16-pin narrow SSOP package.
TYPICAL APPLICATION
Hot Swappable PCI Supply
R1
Q1
0.007⦠IRF7413
R2
Q2
R6
0.005⦠IRF7413
10â¦
SYSTEM
POWER
R5
SUPPLY
10â¦
9
10
11
3
13
12
PCI
POWER
SYSTEM
CONTROLLER
8
3VIN
GND
1
2
12VIN
VEEIN
3VSENSE GATE 3VOUT 5VIN
5VSENSE
5
ON
R3
LTC1643H
10k 6
FAULT
R4
10k 7 PWRGD
RESET
R7
100â¦
14
5VOUT
16
12VOUT
15
VEEOUT
4
TIMER
5V
5A
3.3V
7.6A
GND
C1
0.047µF
C2
0.1µF
12V
500mA
â12V
100mA
LOGIC
RESET
1643 TA01
1
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