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

INA250A1, INA250A2, INA250A3, INA250A4

www.ti.com

SBOS511B – APRIL 2015 – REVISED DECEMBER 2015

Feature Description (continued)

The INA250 has approximately 4.5 m

Ω of package resistance. 2 mΩ of this total package resistance is a

precisely-controlled resistance from the Kelvin-connected current-sensing resistor used by the amplifier. The

power dissipation requirements of the system and package are based on the total 4.5-m

Ω package resistance

between the IN+ and IN– pins. The heat dissipated across the package when current flows through the device

ultimately determines the maximum current that can be safely handled by the package. The current consumption

of the silicon is relatively low, leaving the total package resistance carrying the high load current as the primary

contributor to the total power dissipation of the package. The maximum safe-operating current level is set to

ensure that the heat dissipated across the package is limited so that no damage to the resistor or the package

itself occurs or that the internal junction temperature of the silicon does not exceed a 150°C limit.

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

effectively the heat developed as a result of the current flowing through the total package resistance can be

removed from within the device. Under the conditions of no air flow, a maximum ambient temperature of 85°C,

and 1-oz. copper input power planes, the INA250 can accommodate continuous current levels up to 15 A. As

shown in Figure 30, the current handling capability is derated at temperatures above 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 INA250 can safely accommodate continuous current levels up to 15 A over the entire –40°C to 125°C

temperature range.

Figure 30. Maximum Current vs Temperature

7.3.2 Short-Circuit Duration

The INA250 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 very brief. Figure 31 shows the short-circuit duration curve for the INA250.

Figure 31. Short-Circuit Duration

Copyright © 2015, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Links: INA250A1 INA250A2 INA250A3 INA250A4