ltc1646cgn-trpbf Linear Technology Corporation, ltc1646cgn-trpbf Datasheet - Page 15

• Manufacturer Part Number: ltc1646cgn-trpbf
• Description: Compactpci Dual Hot Swap Controller
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
Table 5. R1 and R2 Resistor Values vs Precharge Voltage
V
1.5V
1.4V
1.3V
1.2V
1.1V
1V
PRECHARGE
Figure 8. Precharge Voltage <1V Application Circuit
LONG 3.3V
HEALTHY#
PCI_RST#
GROUND
I/O PIN 1
BD_SEL#
DATA BUS
3.3V
18Ω
18Ω
18Ω
18Ω
18Ω
18Ω
R1
GND
V
*ADDITIONAL DETAILS OMITTED FOR CLARITY
PRECHARGE
COMPACT PCI
CONNECTOR
6
BACKPLANE
PRECHARGE OUT
4.7nF
(MALE)
R1
9.09Ω
7.15Ω
5.36Ω
3.65Ω
1.78Ω
U
0Ω
R2
=
LTC1646*
18Ω
R1 + R2
R2
R1
PRECHARGE DRIVE
CIRCUIT CARD
COMPACT PCI
CONNECTOR
U
(FEMALE)
• 1V
13
V
0.9V
0.8V
0.7V
0.6V
0.5V
MMBT2222A
PRECHARGE
V(I/O)
V(I/O)
1.8Ω
Z1: BZX84C6V2
14
W
1.2k
3k
12Ω
Figure 10. 3.3V Supply Only Typical Application
1k
3k
Z1
1646 F08
3V
16.2Ω
14.7Ω
12.1Ω
9.09Ω
11Ω
R1
IN
0.1µF
1k
U
15
16
3
4
1.78Ω
3.65Ω
5.11Ω
7.15Ω
9.09Ω
OFF/ON
FAULT
PWRGD
RESETIN
R2
3V
3
10Ω
1
IN
0.005Ω
8
GND
1%
6
3V
SENSE
18Ω
2
4
9
Other CompactPCI Applications
The LTC1646 can be easily configured for applications
where no 5V supply is present by simply tying the 5V
5V
3V
PRECHARGE
IRF7413
GATE
SENSE
OUT
1k
10
13
10Ω
DATA BUS
Figure 9. Precharge Voltage >1V Application Circuit
3V
4.7nF
PRECHARGE OUT
pin (Figure 10).
OUT
LTC1646
I
OUT
7
pins to the 3V
1V ±10%
= ± 55mA
5V
DATA LINE EXAMPLE
18Ω
IN
12
GND
V
*ADDITIONAL DETAILS OMITTED FOR CLARITY
PRECHARGE
DRIVE
5V
6
SENSE
14
R1
MMBT2222A
PRECHARGE
11
=
IN
13
LTC1646*
R1 + R2
PRECHARGE OUT
RESETOUT
5V
R2
4.7nF
pin and tying the 5V
R1
OUT
TIMER
5
12Ω
1k
• 1V
18Ω
2
1
3V
IN
3V
MMBT2222A
10k
DRIVE
1k
OUT
I/O
14
3k
RESET#
BRIDGE
(21154)
12Ω
LTC1646
1k
3.3V
7.6A
3.3V
0.010µF
0.1µF
3V
PCI
IN
3V
OUT
1646 F09
1646 F10
OUT
IN
pin to the
15
IN
1646fa
and