LTC4240
CompactPCI Hot Swap
2
Controller with I C Compatible Interface
FEATURES
DESCRIPTIO
TM
n
Allows Safe Board Insertion and Removal from a
The LTC 4240 is a Hot Swap controller that allows a board
TM
Live CompactPCI Bus
to be safely inserted and removed from a live CompactPCI
TM
2
n 2
I C Compatible 2-Wire Interface
bus slot. The LTC4240 has a built-in 2-wire I C compatible
n
PRECHARGE Output Biases I/O Pins During Card
interface to allow software control and monitoring of
Insertion and Extraction
device function and power supply status. Two external
n
Controls 3.3V, 5V, 12V and 12V Supplies
N-channel transistors control the 3.3V and 5V supplies,
n
Foldback Current Limit with Circuit Breaker
while two internal switches control the 12V and 12V
n
LOCAL_PCI_RST# Logic On-Board
supplies. Electronic circuit breakers protect all four supplies
n
QuickSwitch Enable Output
against overcurrent faults. The PWRGD output indicates
n
Status LED Driver
when all of the supply voltages are within tolerance. The
n
User Programmable Supply Voltage Power-Up Rate
n OFF/ON pin is used to cycle the board power or reset the
Registers Individual Supply Faults
2
n
circuit breaker. The I C interface allows the user to turn the
Available in a 28-Pin Narrow SSOP Package
U
device off or on, set RESETOUT, turn on the status LED
APPLICATIO S
driver and ignore 12V, 12V faults. It also allows the user
to read the status of the FAULT, RESETIN, RESETOUT,
n
Hot Board Insertion into CompactPCI Bus
PWRGD, PRSNT1# and PRSNT2# pins. Under a fault
n
Electronic Circuit Breaker
2
condition, the I C interface can also be used to determine
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
which of the four supplies generated the fault. The LTC4240
QuickSwitch is a registered trademark of Quality Semiconductor Corp.
CompactPCI is a trademark of the PCI Industrial Computer Manufacturers Group.
is available in a 28-pin narrow SSOP package.
2
I C is a trademark of Philips Electronics N.V.
TYPICAL APPLICATIO
CompactPCI CompactPCI
BACKPLANE BACKPLANE
C11
CONNECTOR CONNECTOR
10nF R2 Q2
(MALE) (FEMALE)
0.007
Z4 Z3 Si7880DP
5V
IN 5V
OUT
MEDIUM 5V
R1 + 5V AT 5A
R22, 2.74 Q1
C (5V )
LONG 5V
LOAD OUT
0.005 Si7880DP
3V
IN 3V
OUT
MEDIUM 3.3V
+ 3.3V AT 7.6A
R21, 1.74
C7 C8
R19
LONG 3.3V
C (3V )
LOAD OUT
0.01F 0.01F
2.55k
C1
C10
PER PER R3 R4
1% R5
0.047F
10nF
PIN PIN 5V
10 10 IN
1k
R20
LONG V(I/O)
C9 1.91k
1%
10nF
3V 3V GATE 3V 5V 5V 5V
R12 IN SENSE OUT IN SENSE OUT
R10
10k
ADDRIN
100
DGND
R25, 1.2k
SCL
SCL
R28, 200
SDA
SDA
LED
PRSNT2#
12V
OUT
PRSNT1# 12V
OUT
12V AT 500mA
+
12V 12V
IN C (12V )
LOAD OUT
12V V
EEIN
LTC4240 V
EEOUT
V
R18 EEOUT
5V 12V AT 100mA
IN
1k
R17, 1.2k TIMER
C (V )
C2 LOAD EEOUT
BD_SEL# OFF/ON +
0.1F
EARLY
TO
FAULT
Z1
V(I/O)
BE QUICKSWITCH
R15
R29 R16
ENABLE
2k
10 10k
HEALTHY# PWRGD
RESETOUT 3V
OUT
PCI_RST# RESETIN R6
C6
R30 LOCAL_PCI_RST#
GND PRECHARGE DRIVE 10k
0.01F
1k
R13 R14 Z2
TO PCI BRIDGE
10 10 R8, 1k
R9 DEVICE OR
C4 C5 Z1, Z2: SMAJ12CA R11
C3, 4.7nF
EQUIVALENT
18 24 R7, 12
0.01F 0.01F Z3, Z4: IPMT5.0AT3
3V
GROUND
IN
Q3 4240 TA01
MMBT2222A
4240f
1
U
ULTC4240
UUW
ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
(Notes 1, 2)
ORDER PART
Supply Voltages TOP VIEW
NUMBER
5V .................................................................... 0.3V to 12V
PRSNT1# 1 28 OFF/ON
IN
12V ................................................................. 0.3V to 14V
PRSNT2# 2 27 RESETIN
IN
LTC4240CGN
V ................................................................... 0.3V to 14V 12V 3 26 12V
OUT
IN
EEIN
LTC4240IGN
V 4 25 V
Input Voltages EEOUT
EEIN
TIMER 5 24 3V
OUT
PRSNT1#, PRSNT2#, SCL, RESETIN,
5V 6 23 3V
SENSE
OUT
OFF/ON .................................................. 0.3V to 12V
FAULT 7 22 3V
IN
5V , 5V , 3V ,
OUT SENSE IN
PWRGD 8 21 5V
IN
3V , 3V ............................ 0.3V to (5V + 0.3V)
SENSE OUT IN
BE 9 20 5V
SENSE
ADDRIN, PRECHARGE ......................... 0.3V to 5V
IN
10 19 GATE
GND
Output Voltages
11 18 PRECHARGE
ADDRIN
TIMER, FAULT, PWRGD, SDA, RESETOUT,
12 17 DRIVE
SDA
LED, DRIVE, GATE, 12V ....................... 0.3V to 14V
OUT
13 16 DGND
SCL
V ................................................................ 14V to 0.3V
EEOUT 14 15 LED
RESETOUT
BE ............................................. 0.3V to (5V + 0.3V)
IN
GN PACKAGE
Operating Temperature Range
28-LEAD PLASTIC SSOP
T = 140C, = 135C/W
JMAX JA
LTC4240C ............................................... 0C to 70C
LTC4240I.............................................40C to 85C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Storage Temperature Range .................... 65C to 150C
Lead Temperature (Soldering, 10 sec).................. 300C
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25C. 12V = 12V, V = 12V, V = 3.3V, V = 5V unless otherwise noted.
A IN EEIN 3VIN 5VIN
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I V Supply Current OFF/ON = 0V l 38 mA
DD 12VIN
V Undervoltage Lockout 12V l 7.00 8.00 10.80 V
LKO IN
5V l 4.10 4.3 4.45 V
IN
3V l 2.35 2.45 2.55 V
IN
V l 9 10.5 V
EEIN
V Foldback Current Limit Voltage V = (V V ), V = 0V, TIMER = 0V l 15 25 35 mV
FB FB 5VIN 5VSENSE 5VOUT
V = (V V ), V = 3V, TIMER = 0V l 55 70 85 mV
FB 5VIN 5VSENSE 5VOUT
V = (V V ), V = 0V, TIMER = 0V l 15 25 35 mV
FB 3VIN 3VSENSE 3VOUT
V = (V V ), V = 2V, TIMER = 0V l 55 65 80 mV
FB 3VIN 3VSENSE 3VOUT
V Circuit Breaker Trip Voltage V = (V V ), V = 5V, TIMER = Open l 50 55 60 mV
CB TV 5VIN 5VSENSE 5VOUT
V = (V V ), V = 0V, TIMER = Open l 611 16 mV
TV 5VIN 5VSENSE 5VOUT
V = (V V ), V = 3.3V, TIMER = Open l 50 55 60 mV
TV 3VIN 3VSENSE 3VOUT
= (V V ), V = 0V, TIMER = Open l 611 16 mV
V
TV 3VIN 3VSENSE 3VOUT
t Overcurrent Fault Response Time (V V ) = 100mV, TIMER = Open l 25 35 55 s
OC 5VIN 5VSENSE
Overcurrent Fault Response Time (V V ) = 100mV, TIMER = Open l 25 35 55 s
3VIN 3VSENSE
t Short-Circuit Response Time (V V ) = 200mV, TIMER = Open l 25 35 55 s
SC 5VIN 5VSENSE
(V V ) = 200mV, TIMER = Open l 25 35 55 s
3VIN 3VSENSE
I GATE Pin Turn-On Current OFF/ON = 0V, V = 0V, TIMER = 0V l 20 65 100 A
GATE(UP) GATE
I GATE Pin Turn-Off Current V = 5V, (Note 3) l 100 200 300 A
GATE(DN) GATE
I GATE Pin Fault-Off Current OFF/ON = 0V, V = 2V, TIMER = Open, FAULT = 0V l 2.5 6 8.5 mA
GATE(FAULT) GATE
V External Gate Voltage V = (V V ), I = 1A l 600 1000 mV
GATE GATE 12VIN GATE GATE
4240f
2
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