Datasheet

LTC2977
88
2977fa
For more information www.linear.com/LTC2977
APPLICATIONS INFORMATION
Figure 31. DC1613 Controller Connections When LTC2977 Powered Directly from 3.3V
V
PWR
V
DD33
V
DD33
V
DD25
SCL
SDA
SHARE_CLK
LTC2977_3.3V
IDEAL
DIODE
0R’d 3.3V
0.1µF
0.1µF
WP GND
2977 F31
5.49k
LTC2977*
TO DC1613
I
2
C/SMBUS/PMBUS
CONTROLLER
NOTE: DC1613 CONTROLLER I
2
C CONNECTIONS ARE OPTO-ISOLATED
ISOLATED 3.3V FROM CONTROLLER CAN BE BACK DRIVEN AND WILL ONLY DRAW < 10µA
ISOLATED 3.3V CURRENT LIMIT = 100mA
TO/FROM OTHER
LTC2977s
10k10k
SYSTEM
3.3V
TP0101K-SSOT23
V
IN
GND
CTL
SENSE
GATE
STAT
LTC4412
ISOLATED 3.3V
SCL
SDA
GND
*PIN CONNECTIONS OMITTED FOR CLARITY
Figure 30. DC1613 Controller Connections When V
PWR
Is Used
V
PWR
V
DD33
V
DD33
V
DD25
SCL
SDA
SHARE_CLK
LTC2977*
0.1µF
4.5V TO 15V
0.1µF
0.1µF
WP GND
2977 F30
5.49k10k
49.9k
Si1303
TO DC1613
I
2
C/SMBUS/PMBUS
CONTROLLER
TO/FROM OTHER
LTC2977s
150k
REPEAT OUTLINED CIRCUIT FOR EVERY LTC2977
10k
ISOLATED 3.3V
SCL
SDA
GND
*PIN CONNECTIONS OMITTED FOR CLARITY