Datasheet

LT6106
6
6106fa
BLOCK DIAGRAM
PIN FUNCTIONS
OUT (Pin 1): Current Output. OUT will source a current
that is proportional to the sense voltage into an external
resistor.
V
–
(Pin 2): Normally Connected to Ground.
–IN (Pin 3): The internal sense amplifi er will drive –IN to
the same potential as +IN. A resistor (R
IN
) tied from V
+
to –IN sets the output current I
OUT
= V
SENSE
/R
IN
. V
SENSE
is the voltage developed across R
SENSE
.
+IN (Pin 4): Must be tied to the system load end of the
sense resistor, either directly or through a resistor.
V
+
(Pin 5): Positive Supply Pin. The V
+
pin should be con-
nected directly to either side of the sense resistor, R
SENSE
.
Supply current is drawn through this pin. The circuit may
be confi gured so that the LT6106 supply current is or is
not monitored along with the system load current. To
monitor only the system load current, connect
V
+
to the
more positive side of the sense resistor. To monitor the
total current, including that of the LT6106, connect
V
+
to
the more negative side of the sense resistor.
–
+
V
+
V
–
OUT
6106 F01
V
BATTERY
I
OUT
V
SENSE
R
SENSE
I
LOAD
R
OUT
–
+
L
O
A
D
V
OUT
= V
SENSE
•
R
OUT
R
IN
14k
14k
–IN
+IN
5
2
1
3
4
R
IN
Figure 1. LT6106 Block Diagram and Typical Connection
TYPICAL PERFORMANCE CHARACTERISTICS
V
SENSE
(mV)
0
V
OUT
(V)
4
8
12
2
6
10
40 80 120 160
6106 G21
200200 60 100 140 180
V
+
= 12V
A
V
= 100
R
IN
= 100Ω
R
OUT
= 10k
V
SENSE
(mV)
0
V
OUT
(V)
4
8
12
2
6
10
200 400 600 800
6106 G22
10001000 300 500 700 900
V
+
= 12V
A
V
= 20
R
IN
= 500Ω
R
OUT
= 10k
Supply Current vs Supply Voltage
SUPPLY VOLTAGE (V)
0
0
SUPPLY CURRENT (μA)
20
60
80
100
10
20
25 45
6106 G01
40
515
30
35
40
120
T
A
= –40°C
T
A
= 25°C
T
A
= 70°C
T
A
= 125°C
Output Voltage vs Input Sense
Voltage (0mV ≤ V
SENSE
≤ 1V)
Output Voltage vs Input Sense
Voltage (0mV ≤ V
SENSE
≤ 200mV)