LOAD

Charger

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

20

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