0

20

40

60

80

100

0.1

1

10

100

Time (s)

C027

5

7.5

10

12.5

15

17.5

20

±50

±25

0

25

50

75

100

125

150

Temperature (

ƒC)

C026

13

INA253

www.ti.com

SLOS954A – JULY 2018 – REVISED DECEMBER 2018

Product Folder Links: INA253

Submit Documentation Feedback

Copyright © 2018, Texas Instruments Incorporated

Feature Description (continued)

External factors, such as ambient temperature, external air flow, and PCB layout, contribute to how effectively

the device dissipates heat. The internal heat is developed as a result of the current flowing through the total

package resistance of 4.5 mΩ. Under the conditions of no air flow, a maximum ambient temperature of 85°C, and

1-oz. copper input power planes, the INA253 accommodates continuous current levels up to 15 A. Figure 29

shows that the current-handling capability is derated at temperatures greater than the 85°C level, with safe

operation up to 10 A at a 125°C ambient temperature. With air flow and larger 2-oz. copper input power planes,

the INA253 safely accommodates continuous current levels up to 15 A across the entire –40°C to +125°C

temperature range.

Figure 29. Maximum Continuous Current vs Temperature

8.3.2 Short-Circuit Duration

The INA253 features a physical shunt resistance that is able to withstand current levels higher than the

continuous handling limit of 15 A without sustaining damage to the current-sensing resistor or the current-sensing

amplifier, if the excursions are brief. Figure 30 shows the short-circuit duration curve for the INA253.

Figure 30. Short-Circuit Duration