LTC6103
6
6103f
BLOCK DIAGRAM
PIN FUNCTIONS
OUTA (Pin 1): Current Output of Amplifi er A. OUTA will
source a current that is proportional to the sense voltage
of amplifi er A into an external resistor.
OUTB (Pin 2): Current Output of Amplifi er B. OUTB will
source a current that is proportional to the sense voltage
of amplifi er B into an external resistor.
NC (Pin 3): No Connect.
V
–
(Pin 4): Negative Supply (or Ground for Single Supply
Operation). Common to both amplifi ers.
+INB/V
SB
(Pin 5): The Positive Input of the Internal Sense
Amplifi er B. Must be tied to the system load end of the
sense resistor. It also works as the positive supply for
amplifi er B. Supply current of amplifi er B is drawn through
this pin. The LTC6103 supply current is monitored along
with the system load current.
–INB (Pin 6): The Negative Input of the Internal Sense
Amplifi er B. The internal sense amplifi er will drive –INB
to the same potential as +INB. A resistor (R
IN
) tied from
V
B
+
to –INB sets the output current I
OUT
= V
SENSE
/ R
IN
.
V
SENSE
is the voltage developed across the external R
SENSE
(Figure 1).
–INA (Pin 7): The Negative Input of the Internal Sense
Amplifi er A. The internal sense amplifi er will drive –INA
to the same potential as +INA. A resistor (R
IN
) tied from
V
A
+
to –INA sets the output current I
OUT
= V
SENSE
/ R
IN
.
V
SENSE
is the voltage developed across the external R
SENSE
(Figure 1).
+INA/V
SA
(Pin 8): The Positive Input of the Internal Sense
Amplifi er A. Must be tied to the system load end of the
sense resistor. It also works as the positive supply for
amplifi er A. Supply current of amplifi er A is drawn through
this pin. The LTC6103 supply current is monitored along
with the system load current.
Figure 1. LTC6103 Block Diagram and Typical Connection
+
–
+
–
8 7 6 5
241
+INA
OUTA OUTB
6103 F01
V
SB
V
SA
I
SA
I
SB
I
OUT
I
OUT
–INA –INB
R
IN
5k 5k 5k 5k
R
IN
R
SENSE
R
SENSE
V
SENSE
+–
V
SENSE
+–
V
A
+
V
B
+
+INB
V
–
10V
10V
R
OUT
R
OUT
LOADLOAD
I
LOAD
I
LOAD
R
OUT
R
IN
V
OUT
= V
SENSE
•
