LTC1643HCGN Linear Technology, LTC1643HCGN Datasheet - Page 13

• Manufacturer Part Number: LTC1643HCGN
• Description: IC CONTRLR HOTSWAP PCIBUS 16SSOP
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC1643HCGN

• Applications: CompactPCI™
• Internal Switch(s): No
• Voltage - Supply: 3.3V, 5V, ±12V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIONS
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.
LONG GND
HEALTHY#
MED 3.3V
PCI_RST#
BD_SEL#
MED 5V
–12V
12V
I/O
R12 3 5%
* BZX84C15 (SOT-23)
†
V(I/O)
VALUE MAY VARY FOR BACKPLANES WITHOUT BYPASS CAPACITANCE
R11
1
5%
R13
2k
5%
C6
0.1 F
†
U
C5
0.1 F
D2*
12V
D3*
12V
INFORMATION
U
V(I/O)
V(I/O)
R8
1.2k
5%
R10 2k 5%
R9 2k 5%
V(I/O)
W
1
2
5
6
7
12V
V
ON
FAULT
PWRGD
EEIN
3V
Figure 7. Typical CompactPCI Application
3
IN
1
IN
9
0.005
DATA LINE EXAMPLE
1%
R1
3V
SENSE
2
U
DATA BUS
4
10
GND
IRF7413
8
GATE
Q2
11
R3
10
5%
3V
LTC1643L
OUT
3
LTC1643L/LTC1643L-1/LTC1643H
LTC1643L-1
The LTC1643L-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 12V
The V
still operate normally if a – 12V
However, 12V is still required at the 12V
to function. Refer to Figure 10 for a typical LTC1643L-1
application circuit.
Increasing 12V and – 12V Current Capability
The internal switches in the LTC1643 are designed for up
to 500mA loads on 12V and 200mA on – 12V. If more
current is needed, then the circuits in Figure 8 can be used.
5V
3
IN
1
13
0.007
1%
R2
LOCAL_PCI_RESET#
5V
EEIN
2
10 , 5%
SENSE
TIMER
4
12
R14
IRF7413
4
Q1
pin can be connected to GND and the part will
C2
0.1 F
R4
10
5%
5V
OUT
12V
V
14
EEOUT
OUT
100
5%
R5
16
15
PRECHARGE OUT
1V 20%
I
OUT
R13
10k
5%
OUT
= 40mA
5V
5A
3.3V
7.6A
I/O
12V
500mA
–12V
100mA
C1
0.047 F
C3
0.01 F
and V
RESET#
LONG
3.3V
3.3V
BRIDGE
(21154)
OUT
1N4148
R11
24
5%
PCI
D1
LONG
EEOUT
5V
5V
output is not needed.
R6
130
1%
R7
56.2
1%
pins are disabled.
IN
1643 F07
pin for the part
C4
1 F
OUT
LT1117
ADJ
13
IN
LONG
3.3V