LTC1643AL
LTC1643AL-1/LTC1643AH
PCI-Bus Hot Swap
Controller
FEATURES
DESCRIPTIO
TM
Allows Safe Board Insertion and Removal from a
The LTC 1643A is a Hot Swap controller that allows a board
Live PCI Slot
to be safely inserted and removed from a live PCI-Bus slot.
Works on either a Motherboard (LTC1643AH) or
Two external N-channel transistors control the 3.3V and 5V
TM
CompactPCI Card (LTC1643AL/LTC1643AL-1)
supplies while on-chip switches control the 12V and 12V
Controls 12V, 3.3V, 5V, 12V Supplies
supplies. All supply voltages can be ramped up at a program-
Programmable Foldback Current Limit with
mable rate. An electronic circuit breaker protects all four
Circuit Breaker
supplies against overcurrent faults. The foldback current limit
User-Programmable Supply Voltage Power-Up Rate
feature limits current spikes and power dissipation when
High Side Drive for External N-Channel MOSFETs
shorts occur and allows boards with large capacitances to be
12V and 12V On-Chip Switches
powered up without tripping the circuit breaker. The PWRGD
Fault and Power-Good Outputs
output indicates when all of the supply voltages are within
Available in a Narrow 16-Lead SSOP Package
tolerance and the FAULT output indicates an overcurrent
U
condition. The ON(LTC1643AH)/ON (LTC1643AL/
APPLICATIO S
LTC1643AL-1) pin is used to cycle the board power or reset
the circuit breaker. The LTC1643AL-1 has the 12V power
PCI-Based Servers
good comparators disabled.
CompactPCI Compliant Boards
The LTC1643A is available in a 16-pin narrow SSOP package.
, 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.
TYPICAL APPLICATION
Hot Swappable PCI Supply
R1
Q1
0.007 IRF7413
5V
5A
R6
R2 Q2
10
IRF7413
0.005
3.3V
7.6A
GND
SYSTEM
R5
POWER R7
10
SUPPLY
100
C1
9 10 11 3 13 12 14
0.047F
3V 3V GATE 3V 5V 5V 5V
IN SENSE OUT IN SENSE OUT
8
GND
1
12V
IN
2
V
EEIN
16
5 12V
12V
ON OUT
500mA
LTC1643AH
R3
15
12V
V
10k EEOUT
PCI
100mA
6
POWER FAULT
4
SYSTEM
TIMER
R4
C2
CONTROLLER
10k
7 0.1F
PWRGD LOGIC
RESET RESET
1643A TA01
1643afb
1
U
ULTC1643AL
LTC1643AL-1/LTC1643AH
ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION
(Note 1)
ORDER PART NUMBER
Supply Voltages
TOP VIEW
12V ................................................................ 13.2V
LTC1643AHCGN
IN
V .............................................................. 13.2V 12V 1 16 12V
IN LTC1643ALCGN
EEIN OUT
V 2 15 V
Input Voltage (Pin 5) ................ 0.3V to (12V + 0.3V) EEIN
EEOUT LTC1643AL-1CGN
IN
3V 3 14 5V
OUT
Output Voltages (Pins 6, 7) ...... 0.3V to (12V + 0.3V) OUT
LTC1643AHIGN
IN
TIMER 4 13 5V
IN
Analog Voltages
LTC1643ALIGN
ON/ON* 5 12 5V
SENSE
(Pins 3, 4, 9, 10 to 14) ........ 0.3V to (12V + 0.3V)
LTC1643AL-1IGN
IN
FAULT 6 11 GATE
V ............................................ 13.2V to + 0.3V
EEOUT
GN PART MARKING
7
PWRGD 10 3V
SENSE
12V .............................................. 0.3V to 13.2V
OUT
8 9 1643AH
GND 3V
IN
Operating Temperature Range
1643AL
GN PACKAGE
LTC1643ALC/LTC1643AL-1C/
16-LEAD NARROW PLASTIC SSOP
643AL1
LTC1643AHC ........................................... 0C to 70C *ON FOR LTC1643AH,
643AHI
ON FOR LTC1643AL/LTC1643AL-1
LTC1643ALI/LTC1643AL-1I/
643ALI
T = 150C, = 135C/ W
JMAX JA
LTC1643AHI ...................................... 40C to 85C
43AL1I
Storage Temperature Range ................. 65C to 150C
Order Options Tape and Reel: Add #TR
Lead Temperature (Soldering, 10 sec).................. 300C
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPB
Lead Free Part Marking: