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LTC1643AHIGN Arkusz danych(PDF) 13 Page - Linear Technology

Numer części LTC1643AHIGN
Szczegółowy opis  PCI-Bus Hot Swap Controller
PDF  16 Pages
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Strona internetowa  http://www.linear.com
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LTC1643AHIGN Arkusz danych(HTML) 13 Page - Linear Technology

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LTC1643AL
LTC1643AL-1/LTC1643AH
1643afa
APPLICATIONS INFORMATION
circuit, PCI bridge chip and the LOCAL_PCI_RESET# logic
circuitry. The BD_SEL# signal is connected to the ON pin
while the PWRGD pin is connected to the HEALTHY#
signal. The HEATHLY# signal is combined with the
PCI_RESET# signal to generate the LOCAL_PCI_RESET#
signal. Capacitors C6 and C7 provide chip bypassing on
the 12V and –12V inputs. Diode D2 protects the part from
voltage surges below –13.2V on the –12V supply.
The 1V precharge voltage for the data bus lines is gener-
ated by an LT1117 low dropout regulator. The output of the
LT1117 is set to 1.8V, then the voltage is dropped by a
1N4148 diode to generate 1V. The precharge circuit is
capable of sourcing and sinking 40mA.
R1
0.005
Ω
1%
V(I/O)
V(I/O)
V(I/O)
V(I/O)
Q2
IRF7413
Q1
IRF7413
R2
0.007
Ω
1%
R3
10
Ω
5%
R4
10
Ω
5%
R5
100
Ω
5%
C1
0.047
µF
5V
5A
MED 5V
MED 3.3V
BD_SEL#
LONG GND
PCI_RST#
I/O
3.3V
7.6A
–12V
100mA
12V
500mA
PRECHARGE OUT
1V
±20%
IOUT = ±40mA
R9 2k 5%
R12 3
Ω 5%
R10 2k 5%
R8
1.2k
5%
LOCAL_PCI_RESET#
DATA LINE EXAMPLE
DATA BUS
R14
10
Ω, 5%
11
3
13
12
14
16
15
4
8
10
9
5
6
3VIN
1
2
12V
–12V
12VIN
VEEIN
ON
FAULT
3VSENSE
5VSENSE
3VOUT
LTC1643AL
5VOUT
12VOUT
VEEOUT
TIMER
5VIN
GATE
HEALTHY#
7
PWRGD
1643A F07
C2
0.1
µF
GND
C6
0.1
µF
C5
0.1
µF
C3
0.01
µF
C4
1
µF
D1
1N4148
R13
10k
5%
RESET#
LONG
3.3V
LONG
3.3V
LONG
5V
3.3V
PCI
BRIDGE
(21154)
5V
OUT
IN
ADJ
LT1117
R11
24
Ω
5%
R6
130
Ω
1%
R7
56.2
Ω
1%
I/O
R13
2k
5%
R11
10
Ω†
5%
D2*
12V
D3*
12V
* BZX84C15 (SOT-23)
† VALUE MAY VARY FOR BACKPLANES WITHOUT BYPASS CAPACITANCE
4
3
2
1
4
3
2
1
Figure 7. Typical CompactPCI Application
LTC1643AL-1
The LTC1643AL-1 is designed for CompactPCI designs
where the
±12V supplies are not being used on the board
or the supplies are not well regulated. The power good
comparators on the 12VOUT and VEEOUT pins are disabled.
The VEEIN pin can be connected to GND and the part will
still operate normally if a – 12VOUT output is not needed.
However, 12V is still required at the 12VIN pin for the part
to function. Refer to Figure 10 for a typical LTC1643AL-1
application circuit.



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