Swap Controller. LTC1644 Datasheet

LTC1644 Controller. Datasheet pdf. Equivalent

Part LTC1644
Description CompactPCI Bus Hot Swap Controller
Feature + U U FEATURES s Allows Safe Board Insertion and Removal from a Live, CompactPCITM Bus s Controls –.
Manufacture Linear
Datasheet
Download LTC1644 Datasheet



LTC1644
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 2.74
C6
0.01µF
R21 1.74
C7
0.01µF
3VIN*
Z3
5VIN*
R1
0.005
Q1
IRF7413
Z4
17
R3
10
16 15 18
R2
0.007
Q2
IRF7413
+
CLOAD(5VOUT)
+
C1 CLOAD(3VOUT)
R4
10
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
1
C4
0.01µF
R16
1
C5
0.01µF
I/O DATA LINE 1
R13 10
GND PRECHARGE
8 12
R10
185%
R11
51k
C3 4.7nF
DRIVE
11
R9
24
R8 1k
R12
51k
1V
±10%
Q3 R7
MMBT2222A 12
I/O DATA LINE 128
R14 10
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



LTC1644
LTC1644
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltages
12VIN ................................................................ 13.2V
VEEIN .................................................................. –14V
Input Voltages (Pins 5, 9) .......................– 0.3V to 13.5V
Output Voltages (Pins 6, 7, 10) ..............– 0.3V to 13.5V
Analog Voltages and Currents
Pins 3, 11 to 14, 16 to 18 ...................– 0.3V to 13.5V
Pins 4, 15 ............................. – 0.3V to (12VIN + 0.3V)
VEEOUT ...................................................– 14V to 0.3V
12VOUT ...............................................– 0.3V to 13.2V
Operating Temperature Range
LTC1644C ............................................... 0°C to 70°C
LTC1644I ............................................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
12VIN
VEEIN
5VOUT
TIMER
1
2
3
4
OFF/ON 5
FAULT 6
PWRGD 7
GND 8
RESETIN 9
RESETOUT 10
20 12VOUT
19 VEEOUT
18 3VOUT
17 3VIN
16 3VSENSE
15 GATE
14 5VSENSE
13 5VIN
12 PRECHARGE
11 DRIVE
ORDER PART
NUMBER
LTC1644CGN
LTC1644IGN
GN PACKAGE
20-LEAD PLASTIC SSOP
TJMAX = 140°C, θJA = 135°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
V12VIN = 12V, VEEIN = –12V, V3VIN = 3.3V, V5VIN = 5V unless otherwise noted.
SYMBOL
IDD
VLKO
PARAMETER
V12VIN Supply Current
Undervoltage Lockout
VFB Foldback Current Limit Voltage
VCB Circuit Breaker Trip Voltage
tOC Overcurrent Fault Response Time
tSC Short-Circuit Response Time
ICP GATE Pin Output Current
VGATE
VDROP
External Gate Voltage
Internal Switch Voltage Drop
ICL Current Foldback
TTS Thermal Shutdown Temperature
CONDITIONS
OFF/ON = 0V
12VIN, Ramping Down
3VIN, 5VIN, Ramping Down
VFB = (V5VIN – V5VSENSE), V5VOUT = 0V, TIMER = 0V
VFB = (V5VIN – V5VSENSE), V5VOUT = 3V, TIMER = 0V
VFB = (V3VIN – V3VSENSE), V3VOUT = 0V, TIMER = 0V
VFB = (V3VIN – V3VSENSE), V3VOUT = 2V, TIMER = 0V
VCB = (V5VIN – V5VSENSE), TIMER = FLOAT
VCB = (V3VIN – V3VSENSE), TIMER = FLOAT
(V5VIN – V5VSENSE) = 100mV, TIMER = FLOAT
(V3VIN – V3VSENSE) = 100mV, TIMER = FLOAT
(V5VIN – V5VSENSE) = 200mV, TIMER = FLOAT
(V3VIN – V3VSENSE) = 200mV, TIMER = FLOAT
OFF/ON = 0V, VGATE = 0V, TIMER = 0V
VGATE = 5V, OFF/ON = 4V
OFF/ON = 0V, VGATE = 2V, TIMER = FLOAT, FAULT = 0V
VGATE = (V12VIN – VGATE), IGATE = –1µA
VDROP = (V12VIN – V12VOUT), I = 500mA
VDROP = (VEEOUT – VEEIN), IEE = 100mA
12VIN = 12V, 12VOUT = 0V, TIMER = 0V
12VIN = 12V, 12VOUT = 10V, TIMER = 0V
VEEIN = –12V, VEEOUT = 0V, TIMER = 0V
VEEIN = –12V, VEEOUT = –10V, TIMER = 0V
MIN
q
q 6.00
q 2.25
q8
q 40
q8
q 40
q 40
q 40
q 30
q 30
q
q
q – 20
100
q3
q
q
q
q – 50
q – 525
q 20
q 200
TYP
3
8.30
2.48
12
51
12
51
55
55
45
45
0.1
0.1
– 65
225
10
50
200
110
– 360
– 840
100
320
130
MAX
8
10.80
2.75
15
70
15
70
70
70
60
60
1.0
1.0
– 100
300
20
200
600
250
– 600
– 1500
300
650
UNITS
mA
V
V
mV
mV
mV
mV
mV
mV
µs
µs
µs
µs
µA
µA
mA
mV
mV
mV
mA
mA
mA
mA
°C
1644f
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