LTC4302-1/LTC4302-2
18
sn430212 430212fs
APPLICATIO S I FOR ATIO
U
U
U
5V to 3.3V Level Translator and Power Supply
Redundancy (LTC4302-2)
Systems requiring different supply voltages for the back-
plane side and the card side can use the LTC4302-2 as
shown in Figure 14. The pull-up resistors on the card side
connect from SDAOUT and SCLOUT to V
CC2
and those on
the backplane side connect from SDAIN and SCLIN to V
CC
.
The LTC4302-2 functions for voltages ranging from 2.7V
to 5.5V on both V
CC
and V
CC2
. There is no constraint on the
voltage magnitudes of V
CC
and V
CC2
with respect to each
other.
This application also provides power supply redundancy.
If either the V
CC
or V
CC2
supply voltage falls below its UVLO
threshold, the LTC4302-2 disconnects the backplane from
the card so that the side that is still powered can continue
to function.
Systems with Supply Voltage Droop (LTC4302-1)
In large 2-wire systems, the V
CC
voltages seen by devices
at various points in the system can differ by a few hundred
millivolts or more. This situation is modelled by a series
resistor in the V
CC
line as shown in Figure 15. For proper
operation of the LTC4302-1, make sure that V
CC(BUS)
e
V
CC(LTC4302)
0.5V.
V
CC
V
CC2
LTC4302-2
SDAIN
C2
0.01礔
C1
0.01礔
CARD SDA
CARD SCL
CARD V
CC
3.3V
R5
10k
R6
10k
R7
10k
R8
1k
V
CC
5V
SDA
SCL
SCLIN
CONN
ADDRESS
GND
LED
4203 F14
SDAOUT
SCLOUT
GPIO1
R4
10k
R3
10k
R1
8660&
R2
137&
Figure 14. 5V to 3.3V Level Translator Application
V
CC
LTC4302-1
SDAIN
C1
0.01礔
SDA2
SCL2
R
DROP
V
CC
LOW
R6
10k
R5
10k
R7
1k
R8
1k
R3
10k
R4
10k
R1
8660&
V
CC
R2
137&
SDA
SCL
SCLIN
CONN
ADDRESS
GND
LED
LED
4203 F15
SDAOUT
SCLOUT
GPIO1
GPIO2
Figure 15. System with Supply Voltage Droop
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