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LTC1646CGN Datasheet(PDF) 1 Page - Linear Technology

Part # LTC1646CGN
Description  CompactPCI Dual Hot Swap Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1646CGN Datasheet(HTML) 1 Page - Linear Technology

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LTC1646
1
1646fa
CompactPCI Bus Removable Boards
Allows Safe Board Insertion and Removal from a
Live, CompactPCI
TM Bus
Controls 3.3V and/or 5V Supplies
Programmable Foldback Current Limit During
Power-Up
Dual Level Circuit Breakers Protect Supplies from
Overcurrent and Short-Circuit Faults
LOCAL_PCI_RST# Logic On-Chip
PRECHARGE Output Biases I/O Pins During Card
Insertion and Extraction
User Programmable Supply Voltage Power-Up Rate
15V High Side Drive for External N-Channel
MOSFETS
PWRGD, RESETOUT and FAULT Outputs
CompactPCI Dual
Hot Swap Controller
The LTC
®1646 is a Hot SwapTM controller that allows a
board to be safely inserted and removed from a live
CompactPCI bus slot. Two external N-Channel transistors
control the 3.3V and 5V supplies. The supplies can be
ramped-up in current limit or a programmable rate. Elec-
tronic circuit breakers protect both supplies against
overcurrent fault conditions. The PWRGD output indicates
when all of the supply voltages are within tolerance. The
OFF/ON pin is used to cycle the board power or reset the
circuit breaker. The PRECHARGE output can be used to
bias the bus I/O pins during card insertion and extraction.
PCI_RST# is logically combined on-chip with HEALTHY#
in order to generate LOCAL_PCI_RST# which can be used
to reset the CPCI card logic if either of the supply voltages
is not within tolerance.
The LTC1646 is available in the 16-pin narrow SSOP
package.
Figure 1
MMBT2222A
4.7nF
18
18
12
10
2.7
1.8
R3
10
3k
R4
10
3k
1k
R1
0.005
Ω, 1%
R2
0.007
1%
1k
R5
1k, 5%
10k
10k
3k
1.2k
3VIN
PRECHARGE OUT
1V
±10%
IOUT = ± 55mA
3VIN
3VIN 3VSENSE
5VSENSE
3VOUT
3VOUT
5VOUT
3.3V
5VIN
5VIN
5V
RESET#
I/O
PCI
BRIDGE
(21154)
DATA BUS
DATA BUS
V(I/O)
V(I/O)
0.1
µF
0.1
µF
0.1
µF
C1
0.01
µF
Q2
IRF7413
Q1
IRF7413
5V
5A
3.3V
7.6A
GATE
GND
PRECHARGE
DRIVE
RESETOUT
TIMER
OFF/ON
FAULT
PWRGD
RESETIN
LTC1646
15
89
10
7
12
11
5
2
1
613
14
3
4
16
BD_SEL#
HEALTHY#
PCI_RST#
1646 F01
DATA LINE EXAMPLE
COMPACT PCI
BACKPLANE
CONNECTOR
(MALE)
COMPACT PCI
CIRCUIT CARD
CONNECTOR
(FEMALE)
5V
LONG 5V
3.3V
LONG 3.3V
GROUND
I/O PIN 1
Z1, Z2: BZX84C6V2
Z2
Z1
APPLICATIO S
FEATURES
TYPICAL APPLICATIO
DESCRIPTIO
, LTC and LT 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.


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