INA253

IS-

IS-

IS-

SH-

IN-

DNC1

NC

VS

GND

REF2

IS+

IS+

IS+

SH+

IN+

DNC2

OUT

NC

NC

REF1

Bypass

Capacitor

Power

Supply

VIA

GnD

VIA

GnD

VIA

Signal Plane

Signal Plane

27

INA253

www.ti.com

SLOS954A – JULY 2018 – REVISED DECEMBER 2018

Product Folder Links: INA253

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Copyright © 2018, Texas Instruments Incorporated

10 Power Supply Recommendations

The INA253 makes accurate measurements beyond the connected power-supply voltage (VS) because the

inputs (IN+ and IN–) operate anywhere between –4 V and +80 V, independent of VS. For example, the VS power

supply equals 5 V and the common-mode voltage of the measured shunt can be as high as 80 V. Although the

common-mode voltage of the input can be beyond the supply voltage, the output voltage range of the INA253 is

constrained to the supply voltage.

Place the power-supply bypass capacitor as close as possible to the supply and ground pins. The recommended

value of this bypass capacitor is 0.1 μF. Additional decoupling capacitance can be added to compensate for

noisy or high-impedance power supplies. If the INA253 output is set to mid-supply, then take extreme care to

minimize noise on the power supply.

11 Layout

11.1 Layout Guidelines

•

This device is specified for current handling of up to 10 A over the entire –40°C to +125°C temperature range

using a 1-oz copper pour for the input power plane, as well as no external airflow passing over the device.

•

The primary current-handling limitation for this device is how much heat is dissipated inside the package.

Efforts to improve heat transfer out of the package and into the surrounding environment improve the ability of

the device to handle currents of up to 15 A over the entire –40°C to +125°C temperature range.

•

Heat transfer improvements primarily involve larger copper power traces and planes with increased copper

thickness (2 oz), as well as providing airflow to pass over the device. The INA253 evaluation module (EVM)

features a 2-oz copper pour for the planes, and is capable of supporting 15 A at temperatures up to 125°C.

•

Place the power-supply bypass capacitor as close as possible to the supply and ground pins. The

recommended value of this bypass capacitor is 0.1 µF. Additional decoupling capacitance can be added to

compensate for noisy or high-impedance power supplies.

11.2 Layout Example

Figure 47. INA253 Layout Example