INA700 datasheet(9/43 Pages) TI

9 / 43 page

The IN+ and IN– pins allow access to the on-chip current-sensing resistor. This resistor features internal sense

connections that are factory-calibrated and temperature-compensated to achieve a high level of accuracy. The

INA700 is system-calibrated to ensure that the current-sensing resistor and current-sensing amplifier are both

precisely matched to one another.

The nominal pin-to-pin resistance from IN+ to IN– is approximately 3.5 mΩ, while the internal resistance seen by

the digital power monitor is nominally 2 mΩ. The power dissipation requirements of the system and package are

based on the total package resistance between the IN+ and IN– pins.

7.3.2 Safe Operating Area

The maximum continuous current that can be supported by the device is limited by the PowerWCSP (DSBGA)

package and the maximum die temperature. Limitations due to the PowerWCSP package apply for cases where

the current will be flowing continuously in a single direction for the life of the product. The integrated shunt

section in the Electrical Characteristics specifies the limitations on the current for the PowerWCSP package.

The heat generated by the device power dissipation is another factor that limits the maximum current that can be

safely handled by the package. The current consumed to power the device is low, therefore the primary source

of heating is due to the current flow through the internal shunt resistor. The maximum safe-operating current

level shown in Figure 7-2 is set to ensure that the heat generated in the package is limited so that the internal

junction temperature of the silicon does not exceed 150°C. This data was collected on the evaluation module

that used a 2-layer board with 1-oz copper power planes to the INA700 IN+ and IN– pins.

Ambient Temperature (°C)

-20

100

120

140

160

2.5

7.5

12.5

17.5

22.5

Figure 7-2. Maximum Shunt Current vs Temperature

Even though the shunt can withstand currents greater than 15A, the current measurement capability is limited by

ADC full scale range of 15.728 A. The ADC full scale range is also a function of temperature (see Figure 8-1).

In applications with over-current transients, the peak amplitude and duration of the over-current event is

important to determine the device heating. Figure 7-3 shows the peak pulse current versus pulse duration that

the device can withstand before the maximum junction temperature of 150°C is exceeded. The data shown in

this curve was collected at TA = 25°C, using the INA700 evaluation module.

Pulse Duration (s)

0.01

0.1

100

1000

Figure 7-3. Maximum Pulse Current vs Pulse Duration (Single Event)

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INA700

SBOSAB4 – MAY 2023

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