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What is LTC1644?

This electronic component, produced by the manufacturer "Linear", performs the same function as "CompactPCI Bus Hot Swap Controller".


LTC1644 Datasheet PDF - Linear

Part Number LTC1644
Description CompactPCI Bus Hot Swap Controller
Manufacturers Linear　
Logo Linear Logo　


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Total 24 Pages



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FEATURES
s Allows Safe Board Insertion and Removal from a
Live, CompactPCITM Bus
s Controls –12V, 3.3V, 5V and 12V Supplies
s Adjustable Foldback Current Limit with Circuit
Breaker
s Dual-Level Circuit Breakers Protect 5V and 3.3V
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 Adjustable Supply Voltage Power-Up Rate
U
APPLICATIO S
s Hot Board Insertion into CompactPCI Bus
LTC1644
CompactPCI Bus
Hot Swap Controller
DESCRIPTIO
The LTC®1644 is a Hot SwapTM controller that allows a board
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#.
, 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.
TYPICAL APPLICATIO
5V
LONG 5V
3.3V
LONG 3.3V
12V
–12V
BD_SEL#
HEALTHY#
PCI_RST#
GROUND
I/O PIN 1
I/O PIN 128
PCB EDGE
BACKPLANE BACKPLANE
CONNECTOR CONNECTOR
C8
0.1µF
PER 10
POWER
PINS
C9
0.1µF
PER 10
POWER
PINS
R22 2.74Ω
C6
0.01µF
R21 1.74Ω
C7
0.01µF
3VIN*
Z3
5VIN*
R1
0.005Ω
Q1
IRF7413
Z4
17
R3
10Ω
16 15 18
R2
0.007Ω
Q2
IRF7413
+
CLOAD(5VOUT)
+
C1 CLOAD(3VOUT)
R4
10Ω
R5 0.047µF
1k
13 14
3
5VOUT
5V AT 5.7A
3VOUT
3.3V AT 8A
Z1 Z2
5VIN
EARLY V(I/O)
R17
2k
R20 1.2k
3VIN
1
12VIN
2
VEEIN
R19
1k 5
OFF/ON
6
FAULT
R18
2k 7
PWRGD
9
RESETIN
3VSENSE GATE 3VOUT 5VIN
LTC1644
20-PIN SSOP
5VSENSE
5VOUT
20
12VOUT
+
CLOAD(12VOUT)
19
VEEOUT
CLOAD(VEEOUT)
12VOUT
12V AT 500mA
VEEOUT
–12V AT 100mA
4
TIMER
10
RESETOUT
C2
0.1µF
R6
2k
3VOUT
R15
1Ω
C4
0.01µF
R16
1Ω
C5
0.01µF
I/O DATA LINE 1
R13 10Ω
GND PRECHARGE
8 12
R10
18Ω 5%
R11
51k
C3 4.7nF
DRIVE
11
R9
24Ω
R8 1k
R12
51k
1V
±10%
Q3 R7
MMBT2222A 12Ω
I/O DATA LINE 128
R14 10Ω
Z1, Z2: SMAJ12CA Z3, Z4: 1PMT5.0AT3 *5VIN AND 3VIN MAY BE USED AS SOURCES OF EARLY POWER
3VIN
RESET#
I/O #1
I/O #128
1644 F01
PCI
BRIDGE
CHIP
Figure 1
1644f
1

line_dark_gray
LTC1644 equivalent
LTC1644
TYPICAL PERFOR A CE CHARACTERISTICS
5V/3.3V Circuit Breaker Trip
Voltage vs Temperature
56.2
TIMER PIN FLOATING
56.0
55.8
55.6
55.4
55.2
55.0
54.8
–50 –25
0
25 50 75 100
TEMPERATURE (°C)
1644 G10
GATE Pin Current vs Temperature
(VGATE = 2V, FAULT = 0V)
16
VGATE = 2V
14 FAULT = 0V
12
10
8
6
4
2
0
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
1644 G13
GATE Pin Voltage vs Temperature
11.97
IGATE = –1µA
11.96
11.95
11.94
11.93
11.92
–50 –25
0
25 50 75
TEMPERATURE (°C)
100
1644 G16
5V/3.3V Circuit Breaker Overcurrent
Fault Response Time
vs Temperature
48.0
47.5
47.0
46.5
46.0
45.5
45.0
44.5
–50 –25
0
25 50 75
TEMPERATURE (°C)
100
1644 G11
GATE Pin Current vs Temperature
(VGATE = 5V, OFF/ON = 4V)
300
VGATE = 5V
OFF/ON = 4V
250
200
150
100
50
0
–50 –25
0
25 50 75
TEMPERATURE (°C)
100
1644 G14
12V Internal Switch Voltage Drop
vs Temperature
0.35
I = 500mA
0.30
0.25
0.20
0.15
0.10
0.05
0
–50 –25
0
25 50 75
TEMPERATURE (°C)
100
1644 G17
5V/3.3V Circuit Breaker Short-
Circuit Response Time
vs Temperature
0.125
0.120
0.115
0.110
0.105
0.100
–50 –25
0
25 50
TEMPERATURE (°C)
75 100
1644 G12
GATE Pin Current vs Temperature
(VGATE = 0V, OFF/ON = 0V)
–40
VGATE = 5V
–45 OFF/ON = 4V
–50
–55
–60
–65
–70
–75
–80
–85
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1644 G15
VEE Internal Switch Voltage Drop
vs Temperature
0.18
IEE = 100mA
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
1644 G18
1644f
5


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LTC1644 electronic component.


Information Total 24 Pages
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Download [ LTC1644.PDF Datasheet ]

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