Datasheet

R
SENSE
-+
I
Charge
LOAD
Charger
I
Load
I
Charge
- I
Load
V
S
C1
+IN
-IN
+
-
Preamplifier
Output Buffer
Gain = K2
A1
A2
Gain = 10
OFFSET
Internal
Resistor
100 k:
OUT
Level
shift
1
5
3 4
7
8
LMP8601, LMP8601-Q1
SNOSAR2E –SEPTEMBER 2008–REVISED MARCH 2013 www.ti.com
BATTERY CURRENT MONITOR APPLICATION
This application example shows how the LMP8601/LMP8601Q can be used to monitor the current flowing in and
out a battery pack. The fact that the LMP8601/LMP8601Q can measure small voltages at a high offset voltage
outside the parts own supply range makes this part a very good choice for such applications. If the load current
of the battery is higher then the charging current, the output voltage of the LMP8601/LMP8601Q will be above
the “half offset voltage” for a net current flowing out of the battery. When the charging current is higher then the
load current the output will be below this “half offset voltage”.
K2 = 2
Figure 43. Battery Current Monitor Application
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