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LTC1643AL-1 fiches techniques PDF

Linear - PCI-Bus Hot Swap Controller

Numéro de référence LTC1643AL-1
Description PCI-Bus Hot Swap Controller
Fabricant Linear 
Logo Linear 





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LTC1643AL-1 fiche technique
FEATURES
Allows Safe Board Insertion and Removal from a
Live PCI Slot
Works on either a Motherboard (LTC1643AH) or
CompactPCITM Card (LTC1643AL/LTC1643AL-1)
Controls –12V, 3.3V, 5V, 12V Supplies
Programmable Foldback Current Limit with
Circuit Breaker
User-Programmable Supply Voltage Power-Up Rate
High Side Drive for External N-Channel MOSFETs
–12V and 12V On-Chip Switches
Fault and Power-Good Outputs
Available in a Narrow 16-Lead SSOP Package
U
APPLICATIO S
PCI-Based Servers
CompactPCI Compliant Boards
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC1643AL
LTC1643AL-1/LTC1643AH
PCI-Bus Hot Swap
Controller
DESCRIPTIO
TheLTC®1643AisaHotSwapTM controllerthatallowsaboard
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 –12V 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(LTC1643AH)/ON (LTC1643AL/
LTC1643AL-1) pin is used to cycle the board power or reset
the circuit breaker. The LTC1643AL-1 has the ±12V power
good comparators disabled.
The LTC1643A is available in a 16-pin narrow SSOP package.
TYPICAL APPLICATION
Hot Swappable PCI Supply
R1 Q1
0.007IRF7413
R2
0.005
Q2
IRF7413
R6
10
SYSTEM
POWER
SUPPLY
R5
10
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
LTC1643AH
10k 6
FAULT
R4
10k 7 PWRGD
RESET
R7
100
14
5VOUT
16
12VOUT
15
VEEOUT
4
TIMER
5V
5A
3.3V
7.6A
GND
C1
0.047µF
12V
500mA
–12V
100mA
C2
0.1µF
LOGIC
RESET
1643A TA01
1643afb
1

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