LTC1644 LINER [Linear Technology], LTC1644 Datasheet
LTC1644
Manufacturer Part Number
LTC1644
Description
CompactPCI Bus Hot Swap Controller
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC1644.pdf
(24 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC1644CGN#PBF
Manufacturer:
Linear Technology
Quantity:
135
Company:
Part Number:
LTC1644IGN#PBF
Manufacturer:
LT
Quantity:
4 000
Part Number:
LTC1644IGN#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
I/O PIN 128
LONG 3.3V
HEALTHY#
PCI_RST#
BD_SEL#
LONG 5V
GROUND
I/O PIN 1
Allows Safe Board Insertion and Removal from a
Live, CompactPCI
Controls –12V, 3.3V, 5V and 12V Supplies
Adjustable Foldback Current Limit with Circuit
Breaker
Dual-Level Circuit Breakers Protect 5V and 3.3V
Supplies from Overcurrent and Short-Circuit Faults
LOCAL_PCI_RST# Logic On-Chip
PRECHARGE Output Biases I/O Pins During Card
Insertion and Extraction
Adjustable Supply Voltage Power-Up Rate
Hot Board Insertion into CompactPCI Bus
–12V
3.3V
12V
5V
CONNECTOR
BACKPLANE
CONNECTOR
BACKPLANE
PCB EDGE
U
TM
I/O DATA LINE 1
I/O DATA LINE 128
Z1, Z2: SMAJ12CA
0.01 F
Bus
C6
EARLY V(I/O)
R17
R15
1
2k
C4
0.01 F
Z1
C8
0.1 F
PER 10
POWER
PINS
Z2
R16
1
U
R22 2.74
R21 1.74
Z3, Z4: 1PMT5.0AT3
5V
C5
0.01 F
C7
0.01 F
IN
C9
0.1 F
PER 10
POWER
PINS
R20 1.2k
3V
Z3
IN
*5V
R18
R19
*
R13 10
R14 10
1k
2k
IN
AND 3V
1
2
5
6
7
9
5V
Z4
12V
V
OFF/ON
FAULT
PWRGD
RESETIN
IN
EEIN
*
IN
3V
IN
GND
MAY BE USED AS SOURCES OF EARLY POWER
IN
17
Figure 1
8
0.005
18 5%
R1
R10
PRECHARGE
3V
SENSE
DESCRIPTIO
The LTC
to be safely inserted and removed from a CompactPCI bus
slot. External N-channel transistors control the 3.3V/5V
supplies, while on-chip switches control the
–12V and 12V supplies. The 3.3V and 5V supplies can be
ramped up at a programmable rate. Electronic circuit break-
ers protect all four supplies against overcurrent faults. 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 combined on-chip with
HEALTHY# in order to generate LOCAL_PCI_RST#.
Hot Swap is a trademark of Linear Technology Corporation.
CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group.
16
12
R11
51k
, LTC and LT are registered trademarks of Linear Technology Corporation.
IRF7413
GATE
Q1
15
R3
10
20-PIN SSOP
®
3V
R12
51k
C3 4.7nF
1644 is a Hot Swap
LTC1644
OUT
18
5V
Hot Swap Controller
IN
10%
1V
13
0.007
24
R2
R9
5V
MMBT2222A
U
SENSE
DRIVE
CompactPCI Bus
Q3
14
10
11
R4
IRF7413
Q2
5V
RESETOUT
R8 1k
12
TM
R7
OUT
12V
V
TIMER
3
EEOUT
controller that allows a board
OUT
R5
1k
20
19
4
10
0.047 F
3V
C1
IN
C
C
C
C
LOAD(12VOUT)
LOAD(VEEOUT)
C2
0.1 F
LOAD(5VOUT)
LOAD(3VOUT)
I/O #128
1644 F01
I/O #1
LTC1644
R6
2k
RESET#
+
+
+
BRIDGE
3V
CHIP
+
PCI
OUT
5V
5V AT 5.7A
3V
3.3V AT 8A
12V
12V AT 500mA
V
–12V AT 100mA
EEOUT
OUT
OUT
OUT
1
1644f
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