Datasheet

LTC2870/LTC2871
31
28701f
TYPICAL APPLICATIONS
Figure 47. Typical Supply Connections with External Components Shown
Figure 48. Running Two LTC2870 or LTC2871 Devices from One Shared Power Source
28701 F48
3V TO 5.5V
V
L
V
CC
SW
22µH
470nF
CAP
GND V
DD
V
EE
LTC2870/
LTC2871
SW
CAP V
CC
V
EE
V
L
V
DD
GND
LTC2870/
LTC2871
2.2µF
2.2µF 2.2µF
INDUCTOR: TAIYO YUDEN CBC2518T220M,
MURATA LQH32CN220K53
28701 F47
3V TO 5.5V
3V TO 5.5V
1.7V TO V
CC
TE485
V
L
V
DD
V
EE
V
CC
SW
RS485
INTERFACE
10µH 10µH
220nF 220nF
CAP
H/F
GND
LTC2871
LTC2870
GND
V
CC
485/232
H/F
V
L
V
DD
V
EE
TE485
DY
RA
SW
RO
DIN1
ROUT1
CAP
B
A
DIN2
ROUT2
1µF
DOUT1
RIN1
DOUT2
RIN2
RS232
INTERFACE
DI
120
Z
Y
B
A
Z
Y
120
120
120
2.2µF
1µF
2.2µF
0.1µF
1.7V TO V
CC
0.1µF
1µF
1µF