LTC1646 Просмотр технического описания (PDF) - Linear Technology
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LTC1646 Datasheet PDF : 20 Pages
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FEATURES
s Allows Safe Board Insertion and Removal from a
Live, CompactPCITM Bus
s Controls 3.3V and/or 5V Supplies
s Programmable Foldback Current Limit During
Power-Up
s Dual Level Circuit Breakers Protect Supplies from
Overcurrent and Short-Circuit Faults
s LOCAL_PCI_RST# Logic On-Chip
s PRECHARGE Output Biases I/O Pins During Card
Insertion and Extraction
s User Programmable Supply Voltage Power-Up Rate
s 15V High Side Drive for External N-Channel
MOSFETS
s PWRGD, RESETOUT and FAULT Outputs
U
APPLICATIO S
s CompactPCI Bus Removable 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 the PCI Industrial Computer Manufacturers Group.
LTC1646
CompactPCI Dual
Hot Swap Controller
DESCRIPTIO
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.
TYPICAL APPLICATIO
5V
LONG 5V
3.3V
LONG 3.3V
COMPACT PCI
BACKPLANE
CONNECTOR
(MALE)
COMPACT PCI
CIRCUIT CARD
CONNECTOR
(FEMALE)
2.7Ω
1.8Ω
V(I/O)
BD_SEL#
HEALTHY#
PCI_RST#
1.2k
V(I/O)
3k
Z1
Z2
R1
0.005Ω
1%
Q2
IRF7413
R2
0.007Ω Q1
1% IRF7413
0.1µF
1k
3k
0.1µF
R3
10Ω
R4
10Ω
R5
1k, 5%
8
9
10 7 12
3VIN 3VSENSE GATE 3VOUT 5VIN
15 OFF/ON
11
5VSENSE
5
5VOUT
2 10k
TIMER
3 FAULT
4 PWRGD
16 RESETIN
GND
6
LTC1646
PRECHARGE
13
DRIVE
14
3VOUT
3k
1
RESETOUT
5V
5A
3.3V
7.6A
C1
0.01µF
0.1µF
GROUND
I/O PIN 1
DATA BUS
4.7nF 18Ω
1k
18Ω
12Ω
PRECHARGE OUT MMBT2222A
10k
1V ±10%
IOUT = ± 55mA
3VIN
10Ω
DATA LINE EXAMPLE
DATA BUS
3VIN 5VIN
3.3V 5V
RESET#
I/O PCI
BRIDGE
(21154)
Z1, Z2: BZX84C6V2
1646 F01
Figure 1
1
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