4 mA to 20 mA

CURRENT LOOP

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

+IN

-IN

LOAD

Charger

A/D

Charge

Controler

12V

+

-

Preamplifier

Output Buffer

Gain = K2

A1

A2

Gain = 10

OFFSET

Internal

Resistor

100 k:

C1

OUT

Level

shift

1

5

3

4

7

8

30

LMP8601, LMP8601-Q1

LMP8602, LMP8602-Q1

LMP8603, LMP8603-Q1

SNOSAR2H – SEPTEMBER 2008 – REVISED APRIL 2016

www.ti.com

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

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Copyright © 2008–2016, Texas Instruments Incorporated

Typical Applications (continued)

8.2.4 Advanced Battery Charger Application

Figure 63 can be used to realize an advanced battery charger that has the capability to monitor the exact net

current that flows in and out the battery as show in Figure 64. The output signal of the LMP860x and LMP860x-

Q1 is digitized with the ADC and used as an input for the charge controller. The Charge controller can be used to

regulate the charger circuit to deliver exactly the current that is required by the load, avoiding overcharging a fully

loaded battery.

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

Figure 64. Advanced Battery Charger Application

8.2.5 Current Loop Receiver Application

Many industrial applications use 4-mA to 20-mA transmitters to send an analog value of a sensor to a central

control room. The LMP860x and LMP860x-Q1 can be used as a current loop receiver as shown in Figure 65.

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

Figure 65. Current-Loop Receiver Application