Datasheet

LTC2945
13
2945fa
For more information www.linear.com/LTC2945
applicaTions inForMaTion
C2
V
IN
4V TO 80V
R
SNS
V
OUT
V
DD
INTV
CC
SENSE
+
GND
2945 F02a
SENSE
–
LTC2945
C2
V
IN
0V TO 80V
4V TO 80V
R
SNS
V
OUT
V
DD
INTV
CC
SENSE
+
GND
2945 F02b
SENSE
–
LTC2945
V
IN
0V TO 80V
2.7V TO 5.9V
C2
R
SNS
V
OUT
V
DD
INTV
CC
SENSE
+
GND
2945 F02c
SENSE
–
LTC2945
Figure 2a. LTC2945 Derives Power from
the Supply Being Monitored
Figure 3a. LTC2945 Derives Power
Through High-Side Shunt Regulator
Figure 3b. LTC2945 Derives Power Through Low-Side
Shunt Regulator in High-Side Current Sense Topology
Figure 2b. LTC2945 Derives Power from
a Wide Range Secondary Supply
Figure 2c. LTC2945 Derives Power from
a Low Voltage Secondary Supply
GND
C2R1
R2
V
NEG
>
–80V
R
SNS
V
OUT
V
DD
R
SHUNT
INTV
CC
SENSE
–
GND
ADIN
2945 F03a
SENSE
+
LTC2945
Figure 3c. LTC2945 Derives Power Through Low-Side
Shunt Regulator in Low-Side Current Sense Topology
V
IN
>80V
R
4
R
2
R
SHUNT
ADIN
Q1
GND
2945 F03a
LTC2945
R
3
R
1
INTV
CC
R
SNS
SENSE
+
SENSE
–
V
IN
0V TO 80V
>80V
C2
R
SNS
V
OUT
R
SHUNT
V
DD
INTV
CC
SENSE
+
GND
2945 F03b
SENSE
–
LTC2945