LTC6103 Linear Integrated Systems, LTC6103 Datasheet - Page 6

• Manufacturer Part Number: LTC6103
• Description: High Side Current Sense Amplifier
• Manufacturer: Linear Integrated Systems

PIN FUNCTIONS
LTC6103
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
Operation). Common to both amplifi ers.
+INB/V
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.
BLOCK DIAGRAM
6
–
(Pin 4): Negative Supply (or Ground for Single Supply
SB
(Pin 5): The Positive Input of the Internal Sense
I
Figure 1. LTC6103 Block Diagram and Typical Connection
SA
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LOAD
I
LOAD
V
SA
+ –
8
V
+INA
–
R
5k 5k
SENSE
SENSE
I
OUT
R
+
OUTA
V
OUT
7
A
+
–INA
R
1
IN
10V
4
V
–
10V
–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
V
V
(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
V
V
(Figure 1).
+INA/V
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.
A
B
SENSE
SENSE
+
+
2
OUTB
to –INB sets the output current I
to –INA sets the output current I
R
V
6
B
I
OUT
OUT
+
V
+
R
–INB
5k 5k
R
SA
is the voltage developed across the external R
is the voltage developed across the external R
SENSE
SENSE
IN
–
(Pin 8): The Positive Input of the Internal Sense
–
V
+
5
OUT
V
+INB
I
SB
LOAD
= V
LOAD
SENSE
6103 F01
I
SB
•
R
R
OUT
IN
OUT
OUT
= V
= V
IN
IN
SENSE
SENSE
) tied from
) tied from
SENSE
SENSE
/ R
/ R
6103f
IN
IN
.
.