8.2 Typical Applications

8.2.1 Battery Monitoring Using INA151

The INA151 is an voltage monitoring difference amplifier that processes large differential voltages (up to ±5V)

while offering excellent common-mode rejection (typical 140dB) at large common-mode voltages, up to 110V

from negative supply. The device offers an enable function and provides excellent gain error performance (max

of 0.025% for G=1V/V, 2/3V/V, 1/2V/V).

With the specifications above, the device fits well in serial stacked battery cell testing systems. In these

applications, each cell is connected to an amplifier to monitor precisely the charging and discharging state

of each battery cell. Typically a downstream ADC is used for post processing.

In a 16-battery cell stacked application the typical approach is to connect an external multiplexer that connects

further to a dual or quad channel ADC.

The advantage of the INA151 is that the device offers an enable function, the outputs of the given 16 channels

can be shorted and directly connected to the downstream ADC. The selection of each amplifier can easily be

achieved using a GPIO pin from the downstream MCU and eliminates the need for an external multiplexing

circuit.

Figure 8-2 shows an example circuit that monitors the voltage of 16-battery cells stacked in series battery

voltage and interfaces to the integrated ADC of an C2000 MCU.

Cell1

+

–

+

–

+

–

+

–

Cell2

Cell3

Cell4

Cell13

Cell14

Cell15

Cell16

12-Bit

5-MSPS

ADC

3.3V-REF

GPIO

0-85V

High Voltage DC

Power Supply

MCU

GND

Current Sense

VS = 5V

VS+=5V

GPIO

EN1

EN2

EN3

EN4

EN13

EN14

EN15

EN16

DGND

REF

Cell Cabinet

VOUT (FSR)

C2000

0V to 3.3V

VCM1=0V

VCM16=72V

VCM15=67.5V

VCM14=63V

VCM13=58.5V

VCM4=13.5V

VCM3=9V

VCM2=4.5V

VREFLO

VREFHI

+

–

+

–

+

–

+

–

REF

REF

REF

REF

REF

REF

REF

VS+

Figure 8-2. 16Cell Stacked Battery Voltage Monitoring Circuitry

www.ti.com

INA151

SLVSIL6C – JANUARY 2026 – REVISED APRIL 2026

Copyright © 2026 Texas Instruments Incorporated

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Product Folder Links: INA151