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LTC4240IGN Datasheet

  • LTC4240IGN

  • CompactPCI Hot Swap Controller with I2C Compatible Interface

  • 28頁

  • LINER

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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 鈥?2V Supplies
Foldback Current Limit with Circuit Breaker
LOCAL_PCI_RST# Logic On-Board
QuickSwitch
廬
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
廬
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 鈥?2V 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, 鈥?2V 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, 2.74鈩?/div>
C11
10nF
5V
IN
3V
IN
R21, 1.74鈩?/div>
C10
10nF
R19
2.55k
1%
Z4
Z3
R1
0.005鈩?/div>
Q1
Si7880DP
R2
0.007鈩?/div>
C7
0.01碌F
PER
PIN
C8
0.01碌F
PER
PIN
R3
10鈩?/div>
LONG V(I/O)
C9
10nF
R20
1.91k
R12 1%
10k
R25, 1.2k
R28, 200鈩?/div>
SCL
SDA
3V
IN
ADDRIN
SCL
SDA
PRSNT2#
PRSNT1#
12V
IN
3V
SENSE
GATE
3V
OUT
5V
IN
5V
SENSE
12V
鈥?2V
5V
IN
BD_SEL#
Z1
HEALTHY#
PCI_RST#
R13
10鈩?/div>
C4
0.01碌F
GROUND
R14
10鈩?/div>
C5
0.01碌F
R30
Z2
1k
EARLY
V(I/O)
R17, 1.2k
R18
1k
V
EEIN
OFF/ON
FAULT
LTC4240
R29 R15
2k
10鈩?/div>
R16
10k
C6
0.01碌F
PWRGD
RESETIN
GND
BE
RESETOUT
PRECHARGE
DRIVE
R8, 1k
R6
10k
3V
OUT
Z1, Z2: SMAJ12CA
Z3, Z4: IPMT5.0AT3
R11
18鈩?/div>
C3, 4.7nF
R9
24鈩?/div>
R7, 12鈩?/div>
Q3
MMBT2222A
3V
IN
+
U
Q2
Si7880DP
U
U
+
C
LOAD
(5V
OUT
)
5V
OUT
5V AT 5A
+
R4
10鈩?/div>
R5
1k
C1
0.047碌F
3V
OUT
3.3V AT 7.6A
C
LOAD
(3V
OUT
)
5V
IN
5V
OUT
DGND
LED
12V
OUT
R10
100鈩?/div>
+
12V
OUT
12V AT 500mA
C
LOAD
(12V
OUT
)
V
EEOUT
鈥?2V AT 100mA
V
EEOUT
TIMER
C2
0.1碌F
C
LOAD
(V
EEOUT
)
TO
QUICKSWITCH
廬
ENABLE
LOCAL_PCI_RST#
TO PCI BRIDGE
DEVICE OR
EQUIVALENT
4240 TA01
4240f
1

LTC4240IGN 產(chǎn)品屬性

  • LTC4240

  • 49

  • 集成電路 (IC)

  • PMIC - 熱交換

  • -

  • 熱交換控制器

  • CompactPCI?

  • 無

  • -

  • 3.3V，5V，±12V

  • -40°C ~ 85°C

  • 表面貼裝

  • 28-SSOP（0.154"，3.90mm 寬）

  • 28-SSOP

  • 管件

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