LTC4240
CompactPCI Hot Swap
Controller with I
2
C Compatible Interface
FEATURES
s
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
Allows Safe Board Insertion and Removal from a
Live CompactPCI
TM
Bus
I
2
C
TM
Compatible 2-Wire Interface
PRECHARGE Output Biases I/O Pins During Card
Insertion and Extraction
Controls 3.3V, 5V, 12V and –12V Supplies
Foldback Current Limit with Circuit Breaker
LOCAL_PCI_RST# Logic On-Board
QuickSwitch
®
Enable Output
Status LED Driver
User Programmable Supply Voltage Power-Up Rate
Registers Individual Supply Faults
Available in a 28-Pin Narrow SSOP Package
APPLICATIO S
s
s
Hot Board Insertion into CompactPCI Bus
Electronic Circuit Breaker
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
QuickSwitch is a registered trademark of Quality Semiconductor Corp.
CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group.
I
2
C is a trademark of Philips Electronics N.V.
The LTC
®
4240 is a Hot Swap
TM
controller that allows a board
to be safely inserted and removed from a live CompactPCI
bus slot. The LTC4240 has a built-in 2-wire I
2
C compatible
interface to allow software control and monitoring of
device function and power supply status. Two external
N-channel transistors control the 3.3V and 5V supplies,
while two internal switches control the –12V and 12V
supplies. Electronic circuit breakers 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 I
2
C interface allows the user to turn the
device off or on, set RESETOUT, turn on the status LED
driver and ignore 12V, –12V faults. It also allows the user
to read the status of the FAULT, RESETIN, RESETOUT,
PWRGD, PRSNT1# and PRSNT2# pins. Under a fault
condition, the I
2
C interface can also be used to determine
which of the four supplies generated the fault. The LTC4240
is available in a 28-pin narrow SSOP package.
TYPICAL APPLICATIO
CompactPCI
BACKPLANE
CONNECTOR
(MALE)
MEDIUM
5V
LONG 5V
MEDIUM
3.3V
LONG 3.3V
CompactPCI
BACKPLANE
CONNECTOR
(FEMALE)
R22, 2.74Ω
C11
10nF
5V
IN
3V
IN
R21, 1.74Ω
C10
10nF
R19
2.55k
1%
Z4
Z3
R1
0.005Ω
Q1
Si7880DP
R2
0.007Ω
C7
0.01µF
PER
PIN
C8
0.01µF
PER
PIN
R3
10Ω
LONG V(I/O)
C9
10nF
R20
1.91k
R12 1%
10k
R25, 1.2k
R28, 200Ω
SCL
SDA
3V
IN
ADDRIN
SCL
SDA
PRSNT2#
PRSNT1#
12V
IN
3V
SENSE
GATE
3V
OUT
5V
IN
5V
SENSE
12V
–12V
5V
IN
BD_SEL#
Z1
HEALTHY#
PCI_RST#
R13
10Ω
C4
0.01µF
GROUND
R14
10Ω
C5
0.01µF
R30
Z2
1k
EARLY
V(I/O)
R17, 1.2k
R18
1k
V
EEIN
OFF/ON
FAULT
LTC4240
R29 R15
2k
10Ω
R16
10k
C6
0.01µF
PWRGD
RESETIN
GND
BE
RESETOUT
PRECHARGE
DRIVE
R8, 1k
R6
10k
3V
OUT
Z1, Z2: SMAJ12CA
Z3, Z4: IPMT5.0AT3
R11
18Ω
C3, 4.7nF
R9
24Ω
R7, 12Ω
Q3
MMBT2222A
3V
IN
+
U
Q2
Si7880DP
U
U
+
C
LOAD
(5V
OUT
)
5V
OUT
5V AT 5A
+
R4
10Ω
R5
1k
C1
0.047µF
3V
OUT
3.3V AT 7.6A
C
LOAD
(3V
OUT
)
5V
IN
5V
OUT
DGND
LED
12V
OUT
R10
100Ω
+
12V
OUT
12V AT 500mA
C
LOAD
(12V
OUT
)
V
EEOUT
–12V AT 100mA
V
EEOUT
TIMER
C2
0.1µF
C
LOAD
(V
EEOUT
)
TO
QUICKSWITCH
®
ENABLE
LOCAL_PCI_RST#
TO PCI BRIDGE
DEVICE OR
EQUIVALENT
4240 TA01
4240f
1
LTC4240
ABSOLUTE
(Notes 1, 2)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
PRSNT1#
PRSNT2#
12V
IN
V
EEIN
TIMER
5V
OUT
FAULT
PWRGD
BE
1
2
3
4
5
6
7
8
9
28 OFF/ON
27 RESETIN
26 12V
OUT
25 V
EEOUT
24 3V
OUT
23 3V
SENSE
22 3V
IN
21 5V
IN
20 5V
SENSE
19 GATE
18 PRECHARGE
17 DRIVE
16 DGND
15 LED
Supply Voltages
5V
IN ....................................................................
–0.3V to 12V
12V
IN .................................................................
–0.3V to 14V
V
EEIN ...................................................................
0.3V to –14V
Input Voltages
PRSNT1#, PRSNT2#, SCL, RESETIN,
OFF/ON .................................................. –0.3V to 12V
5V
OUT
, 5V
SENSE
, 3V
IN
,
3V
SENSE
, 3V
OUT ............................
–0.3V to (5V
IN
+ 0.3V)
ADDRIN, PRECHARGE ......................... –0.3V to 5V
IN
Output Voltages
TIMER, FAULT, PWRGD, SDA, RESETOUT,
LED, DRIVE, GATE, 12V
OUT .......................
–0.3V to 14V
V
EEOUT ................................................................
–14V to 0.3V
BE ............................................. 0.3V to (5V
IN
+ 0.3V)
Operating Temperature Range
LTC4240C ............................................... 0°C to 70°C
LTC4240I .............................................–40°C to 85°C
Storage Temperature Range .................... 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC4240CGN
LTC4240IGN
GND 10
ADDRIN 11
SDA 12
SCL 13
RESETOUT 14
GN PACKAGE
28-LEAD PLASTIC SSOP
T
JMAX
= 140°C,
θ
JA
= 135°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 12V
IN
= 12V, V
EEIN
= –12V, V
3VIN
= 3.3V, V
5VIN
= 5V unless otherwise noted.
SYMBOL
I
DD
V
LKO
PARAMETER
V
12VIN
Supply Current
Undervoltage Lockout
CONDITIONS
OFF/ON = 0V
12V
IN
5V
IN
3V
IN
V
EEIN
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 0V, TIMER = 0V
V
FB
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 3V, TIMER = 0V
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 0V, TIMER = 0V
V
FB
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 2V, TIMER = 0V
V
TV
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 5V, TIMER = Open
V
TV
= (V
5VIN
– V
5VSENSE
), V
5VOUT
= 0V, TIMER = Open
V
TV
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 3.3V, TIMER = Open
V
TV
= (V
3VIN
– V
3VSENSE
), V
3VOUT
= 0V, TIMER = Open
(V
5VIN
– V
5VSENSE
) = 100mV, TIMER = Open
(V
3VIN
– V
3VSENSE
) = 100mV, TIMER = Open
(V
5VIN
– V
5VSENSE
) = 200mV, TIMER = Open
(V
3VIN
– V
3VSENSE
) = 200mV, TIMER = Open
OFF/ON = 0V, V
GATE
= 0V, TIMER = 0V
V
GATE
= 5V, (Note 3)
OFF/ON = 0V, V
GATE
= 2V, TIMER = Open, FAULT = 0V
∆V
GATE
= (V
12VIN
– V
GATE
), I
GATE
= 1µA
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
MIN
7.00
4.10
2.35
15
55
15
55
50
6
50
6
25
25
25
25
– 20
100
2.5
TYP
3
8.00
4.3
2.45
–9
25
70
25
65
55
11
55
11
35
35
35
35
– 65
200
6
600
MAX
8
10.80
4.45
2.55
–10.5
35
85
35
80
60
16
60
16
55
55
55
55
–100
300
8.5
1000
UNITS
mA
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
µs
µs
µs
µs
µA
µA
mA
mV
4240f
V
FB
Foldback Current Limit Voltage
V
CB
Circuit Breaker Trip Voltage
t
OC
t
SC
Overcurrent Fault Response Time
Overcurrent Fault Response Time
Short-Circuit Response Time
I
GATE(UP)
GATE Pin Turn-On Current
I
GATE(DN)
GATE Pin Turn-Off Current
I
GATE(FAULT)
GATE Pin Fault-Off Current
∆V
GATE
External Gate Voltage
2
U
W
U
U
W W
W
LTC4240
ELECTRICAL CHARACTERISTICS
SYMBOL
∆V
12V
∆V
VEE
I
CL
I
TH
T
TS
V
TH
PARAMETER
12V Switch Voltage Drop
V
EE
Switch Voltage Drop
Current Foldback
Current Fault Threshold
Thermal Shutdown Temperature
Power Good Threshold Voltage
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 12V
IN
= 12V, V
EEIN
= –12V, V
3VIN
= 3.3V, V
5VIN
= 5V unless otherwise noted.
CONDITIONS
∆V
12V
= (V
12VIN
– V
12VOUT
), I = 500mA
∆V
VEE
= (V
EEOUT
– V
EEIN
), I = 100mA
12V
IN
= 12V, 12V
OUT
= 0V
V
EEIN
= –12V, V
EEOUT
= 0V
12V
IN
= 12V
V
EEIN
= –12V
Note 4
12V
OUT
5V
OUT
3V
OUT
V
EEOUT
OFF/ON, RESETIN, SCL, SDA, PRSNT1#, PRSNT2#
OFF/ON, RESETIN, SCL, SDA, PRSNT1#, PRSNT2#
OFF/ON = RESETIN = SDA = SCL = 0V, 5V,
PRSNT1#, PRSNT2# = 0V, 5V
RESETOUT = FAULT = 12V, OFF/ON = 0V, RESETIN = 3.3V
PWRGD = 12V, OFF/ON = 4V
5V
SENSE
= 5V, 5V
OUT
= 0V, GATE = 0V
3V
SENSE
= 3.3V, 3V
OUT
= 0V, GATE = 0V
5V
IN
= 5V, TIMER = 0V, OFF/ON = 0V
3V
IN
= 3.3V, TIMER = Open
3V
IN
= 3.3V, TIMER = 0V
5V
OUT
= 5V, OFF/ON = 0V, TIMER = 0V, GATE = 0V
3V
OUT
= 3.3V, OFF/ON = 0V, TIMER = 0V, GATE = 0V
TIMER = 0V, OFF/ON = 0V
V
PRECHARGE
= 1V
ADDRIN = 0V, 5V
OFF/ON = 0V, TIMER = 0V
TIMER = 5V, OFF/ON = 2V
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
MIN
TYP
300
125
MAX
600
250
– 800
350
UNITS
mV
mV
mA
mA
mA
mA
°C
V
V
V
V
V
V
µA
µA
µA
µA
µA
µA
mA
µA
µA
µA
µA
µA
µA
µA
µA
mA
V
Ω
Ω
Ω
Ω
V
V
V
V
V
kHz
µs
µs
µs
4240f
– 50
50
–550
225
10.8
4.50
2.8
– 10
2
–350
250
– 1250 – 1900
500
800
150
11.1
4.65
2.9
– 10.5
11.4
4.75
3.0
– 10.8
0.8
±0.08
±0.08
±0.08
±0.08
55
55
0.8
250
250
237
120
–950
±2
±2
±2
±2
100
100
1.5
600
500
400
200
–1200
10
±0.1
V
IL
V
IH
I
IN
Input Low Voltage
Input High Voltage
Input Current PRSNT1#, PRSNT2#,
OFF/ON, RESETIN, SDA, SCL
RESETOUT, FAULT Leakage Current
PWRGD Leakage Current
5V
SENSE
Input Current
3V
SENSE
Input Current
5V
IN
Input Current
3V
IN
Input Current
5V
OUT
Input Current
3V
OUT
Input Current
V
EEIN
Input Current
Precharge Input Current
ADDRIN
I
TIMER
V
TIMER
R
DIS
TIMER Pin Current
TIMER Threshold Voltages
12V
OUT
Discharge Impedance
5V
OUT
Discharge Impedance
3V
OUT
Discharge Impedance
V
EEOUT
Discharge Impedance
CMOS Output High Voltage
CMOS Output Low Voltage
Output Low Voltage
Output Low Voltage
PRECHARGE Reference Voltage
SCL Clock Frequency
Start Condition Setup Time
Bus Free Time Between Stop and Start
Start Condition Hold Time
–6
15
5
– 11.5
28
5.5
430
50
150
650
–17
55
6.5
1000
100
300
1000
0.4
0.4
0.8
V
OH
V
OL
BE, I = –100µA
BE, I = 100µA
PWRGD, RESETOUT, FAULT, SDA(I = 3mA)
LED (I = 10mA)
V
5VIN
= 5V
q
5V
IN
– 0.4
q
q
q
q
V
PXG
f
SCL
t
SUSTA
t
BUF
t
HDSTA
0.9
1
1.1
100
I
2
C Timing (Note 4)
4.7
4.7
4
3
LTC4240
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. 12V
IN
= 12V, V
EEIN
= –12V, V
3VIN
= 3.3V, V
5VIN
= 5V unless otherwise noted.
SYMBOL
t
SUSTP
t
HDDAT
t
SUDAT
t
LOW
t
HIGH
t
f
t
r
PARAMETER
Stop Condition Setup Time
Data Hold Time
Data Setup Time
Clock Low Period
Clock High Period
Clock/Data Fall Time
Clock/Data Rise Time
Note 3:
OFF/ON pin pulled up to 5V by 1.2k resistor.
Note 4:
Parameters guaranteed by design and not tested.
CONDITIONS
MIN
4
300
250
4.7
4.0
300
1000
TYP
MAX
UNITS
µs
ns
ns
µs
µs
ns
ns
ELECTRICAL CHARACTERISTICS
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
All currents into device pins are positive; all currents out of
device pins are negative. All voltages are referenced to ground unless
otherwise specified.
TYPICAL PERFOR A CE CHARACTERISTICS
Gate Pin Fault Current
vs Temperature
8
V
GATE
= 2V
FAULT = 0V
350
GATE PIN FAULT CURRENT (mA)
GATE PIN CURRENT (µA)
6
GATE PIN CURRENT (µA)
4
2
0
–50
–25
0
25
50
TEMPERATURE (°C)
12V
IN
Supply Current
vs Temperature
4.0
OFF/ON = 0V
280
12V
IN
SUPPLY CURRENT (mA)
3.6
260
5V
IN
SUPPLY CURRENT (mA)
3V
IN
SUPPLY CURRENT (µA)
3.2
2.8
2.4
–50
–25
0
25
50
TEMPERATURE (°C)
4
U W
75
100
4240 G01
Gate Pin Turn-Off Current
vs Temperature
V
GATE
= 5V
OFF/ON = 2V
–20
Gate Pin Turn-On Current
vs Temperature
V
GATE
= 0V
OFF/ON = 0V
300
–40
250
–60
200
150
–80
100
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G02
–100
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G03
3V
IN
Supply Current
vs Temperature
OFF/ON = 0V
1.0
5V
IN
Supply Current
vs Temperature
OFF/ON = 0V
0.9
0.8
0.7
240
0.6
75
100
4240 G04
220
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G05
0.5
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G06
4240f
LTC4240
TYPICAL PERFOR A CE CHARACTERISTICS
V
EEIN
Supply Current
vs Temperature
–0.8
OFF/ON = 0V
12V
IN
FOLDBACK CURRENT LIMIT (A)
V
EEIN
SUPPLY CURRENT (mA)
12V
OUT
= 10V
1.2
V
EE
FOLDBACK CURRENT LIMIT (A)
–0.9
–1.0
–1.1
–1.2
–50
–25
0
25
50
TEMPERATURE (°C)
12V Output Current
1.6
0.5
12V
IN
= 12V
T
A
= 25°C
0.4
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
1.2
0.3
0.8
0.2
0.4
0.1
0
0
2
4
6
8
OUTPUT VOLTAGE (V)
10
12
4240 G10
0
0
–2
–4
–6
–8
OUTPUT VOLTAGE (V)
–10
–12
4240 G11
12V
OUT
PWRGD THRESHOLD VOLTAGE (V)
3V
OUT
PWRGD Threshold Voltage
vs Temperature
3.00
3V
OUT
PWRGD THRESHOLD VOLTAGE (V)
5V
OUT
PWRGD THRESHOLD VOLTAGE (V)
V
EEOUT
PWRGD THRESHOLD VOLTAGE (V)
2.95
2.90
2.85
2.80
–50
–25
0
25
50
TEMPERATURE (°C)
U W
75
4240 G07
12V
IN
Foldback Current Limit
vs Temperature
1.6
0.7
0.6
0.5
0.4
0.3
V
EEIN
Foldback Current Limit
vs Temperature
V
EEOUT
= –10V
0.8
V
EEOUT
= 0V
0.2
0.1
0
–50
0.4
12V
OUT
= 0V
100
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G08
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G09
–12V Output Current
V
EEIN
= –12V
T
A
= 25°C
11.4
11.3
11.2
11.1
11.0
10.9
12V
OUT
PWRGD Threshold
Voltage vs Temperature
10.8
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G12
5V
OUT
PWRGD Threshold Voltage
vs Temperature
4.75
–10.2
–10.3
–10.4
–10.5
–10.6
–10.7
V
EEOUT
PWRGD Threshold
Voltage vs Temperature
4.70
4.65
4.60
4.55
75
100
4240 G13
4.50
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G14
–10.8
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4240 G15
4240f
5
