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LTC4244IGN-1 Datasheet

  • LTC4244IGN-1

  • Rugged, CompactPCI Bus Hot Swap Controllers

  • 28頁

  • LINER

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LTC4244/LTC4244-1
Rugged, CompactPCI Bus
Hot Swap Controllers
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
Controls 鈥?2V, 3.3V, 5V and 12V Supplies
鹵14.4V
Absolute Maximum Rating for 12V
IN
and 鈥?2V
IN
Input Pins
Insensitive to Supply Voltage Transients
Adjustable Foldback Current Limit with Circuit Breaker
LOCAL_PCI_RST# Logic On-Chip
PRECHARGE Output Biases I/O Pins During Card
Insertion and Extraction
LTC4244-1 Designed for Applications without 鈥?2V
Available in 20-Lead Narrow SSOP Package
APPLICATIO S
s
Hot Board Insertion into CompactPCI Bus
, 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.
The LTC
廬
4244/LTC4244-1 are Hot Swap
TM
controllers that
allow a board to be safely inserted into and removed from
a CompactPCI
TM
bus slot. External N-channel transistors
control the 5V and 3.3V supplies while on-chip switches
control the
鹵12V
supplies. The 3.3V and 5V supplies can
be ramped up at an adjustable rate. Electronic circuit
breakers protect all four supplies against overcurrent
faults. After the power-up cycle is complete, the TIMER pin
capacitor serves as auxiliary V
CC
allowing the LTC4244/
LTC4244-1 to function without interruption in the pres-
ence of voltage spikes on the 12V
IN
supply. The PWRGD
output indicates when all four supplies are within toler-
ance. The OFF/ON pin is used to cycle board power or reset
the circuit breaker. The PRECHARGE output can be used
to bias the bus I/O pins during card insertion and extrac-
tion. PCI_RST# is combined on-chip with HEALTHY# in
order to generate LOCAL_PCI_RST#.
TYPICAL APPLICATIO
5V
LONG 5V
3.3V
LONG 3.3V
C8
0.01碌F PER
POWER PIN
R22
2.7鈩?/div>
C9
0.01碌F PER
POWER PIN
5V
IN
R2
Q2
0.007鈩?IRF7457
3.3V
IN
R21
1.8鈩?/div>
C6
0.01碌F
C7
0.01碌F
Z3
Z4
R1
0.005鈩?/div>
Q1
IRF7457
R3
10鈩?/div>
Z1
12V
鈥?2V
Z2
3.3V
IN
3.3V
SENSE
GATE 3.3V
OUT
5V
IN
12V
IN
V
EEIN
R19 1k
OFF/ON
R20
1.2k
R18 10k
FAULT
PWRGD
RESETIN
GND PRECHARGE
LTC4244
5V
SENSE
BD_SEL#
LONG V(I/O)
R17
10k
HEALTHY#
PCI_RST#
R15
1鈩?/div>
C4
0.01碌F
GROUND
I/O DATA LINE 1
R13
10鈩?/div>
R16
1鈩?/div>
C5
0.01碌F
TIMER
DRIVE RESETOUT
C3 4.7nF
R9 24鈩?/div>
R8 1k
LOCAL_PCI_RST#
R10 18鈩?/div>
R11
10k
R12
10k
I/O PIN 1
I/O PIN 128
1V
鹵10%
Q3
R7 12鈩?/div>
MMBT2222A
鈥?/div>
鈥?/div>
鈥?/div>
I/O DATA LINE 128
Z1, Z2: SMAJ12A
鈥?/div>
鈥?/div>
鈥?/div>
Z3, Z4: SMAJ5.0A
R14
10鈩?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Figure 1. Typical Compact PCI Application
42441f
+
U
+
C
LOAD(5VOUT)
V
OUT
5V
5A
V
OUT
3.3V
7A
U
U
+
C
LOAD(3.3VOUT)
R4
10鈩?/div>
C1
R5 0.33碌F
1k
5V
OUT
12V
OUT
+
C
LOAD(12VOUT)
V
OUT
12V
500mA
V
EEOUT
鈥?2V
100mA
V
EEOUT
C
LOAD(VEEOUT)
C2
0.082碌F
R6
10k
V
OUT
3.3V
V
IN
3.3V
RESET#
I/O #1
PCI
BRIDGE
I/O #128 CHIP
4244 F01
1

LTC4244IGN-1 產(chǎn)品屬性

  • LTC4244/-1

  • 55

  • 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

  • 20-SSOP（0.154"，3.90mm 寬）

  • 20-SSOP

  • 管件

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