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

29

LMP8601, LMP8601-Q1

LMP8602, LMP8602-Q1

LMP8603, LMP8603-Q1

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SNOSAR2H – SEPTEMBER 2008 – REVISED APRIL 2016

Product Folder Links: LMP8601 LMP8601-Q1 LMP8602 LMP8602-Q1 LMP8603 LMP8603-Q1

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Typical Applications (continued)

8.2.3 Battery Current Monitor Application

This application example shows how the LMP860x and LMP860x-Q1 can be used to monitor the current flowing

in and out of a battery pack. The fact that the LMP860x and LMP860x-Q1 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 LMP860x and LMP860x-

Q1 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.

NOTE: K2 = 2 for LMP8601, LMP8601-Q1; 5 for LMP8602, LMP8602-Q1; or 10 for LMP8603, LMP8603-Q1.

Figure 63. Battery Current Monitor Application