Datasheet

LTC4222
28
4222fb
TYPICAL APPLICATIONS
Figure 12. 3.3V and 12V Application with Sequenced Turn-On Optically Isolated I
2
C Communication
and 5A Current Limits. Schottky Diode Allows 3.3V Switch to Turn On When 12V is Absent
UV1 V
DD1
LTC4222
GATE1
INTV
CC
ADR2
ADR1NC
ADR0
CONFIG
SOURCE1
UV2 V
DD2
GATE2 SOURCE2
OV1
OV2
ALERT
SCL
SDA0
SDA1
FB1
ADIN1
TIMER INTV
CC
INTV
CC
GPIO1
EN1
SS
PLUG-IN
CARD
R5-1
10Ω
R6-1
15k
R10
3.3k
C1-1
22nF
C
SS
68nF
R
S1
0.01Ω
Q1
FDD3706
R7-1
10.2k
R8-1
3.57k
R4-1
100k
4222 TA03
C
F1
0.1µF
R1-1
34k
R2-1
1.02k
470Ω
R3-1
3.4k
Z1
SA14A
BAT
254
BACKPLANE
SCL
GND
GND
SDA
5V
V
IN1
12V
ADIN2
FB2
GPIO2
EN2
C3
0.1µF
R5-2
10Ω
R6-2
15k
C1-2
22nF
R
S2
0.01Ω
Q2
FDD3706
R7-2
4.99k
R8-2
3.57k
C
F2
0.1µF
R1-2
6.55k
R2-2
1.02k
R3-2
3.4k
Z2
SA14A
V
IN2
3.3V
ON2
ON1
6
5
2
3
HCPL-0300
5V
2
8
8
3
6
5
HCPL-0300
R9
10k
INTV
CC
R10
3.3k
5V
2 8
3
6
5
HCPL-0300
R12
10k
INTV
CC
SENSE1
–
SENSE2
–