INA2227 datasheet(35/43 Pages) TI2

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Place the required power-supply bypass capacitors as close as possible to the supply and ground pins of the

device to provide stability. A typical value for this supply bypass capacitor is 0.1µF. Applications with noisy or

high-impedance power supplies can require additional decoupling capacitors to reject power-supply noise.

8.4 Layout

8.4.1 Layout Guidelines

Connect all input pins (IN+X and IN–X) to the sensing resistor using a Kelvin connection or a 4-wire connection

for each channel. These connection techniques verify that only the current-sensing resistor impedance is

detected between the input pins. Poor routing of the current-sensing resistor commonly results in additional

resistance present between the input pins. Given the very low ohmic value of the current-sensing resistor,

any additional high-current carrying impedance causes significant measurement errors. Place the power-supply

bypass capacitor as close as possible to the supply and ground pins.

8.4.2 Layout Example

INA2227 Layout Example DSBGA (High Side)

DNC

VBUS1

IN+1

DNC

IN-2

VBUS2

IN+2

SDA

VIA to Ground

Plane

Load2

Bus Voltage 2:

up to 48V

RSHUNT2

Direction of Postive

Current Flow

RSHUNT1

Direction of Postive

Current Flow

SCL

GND

IN-1

ALERT VS

Control EN externally

or connect to VS

Supply Voltage:

1.7V to 5.5V

2C Clock, connect to

pullup resistor to supply

Address Pin connect to

VS, SDA, SCL, or GND

2C Data, connect to pullup

resistor to supply

Alert, connect to pullup

resistor to supply

Bus Voltage 1:

up to 48V

Load1

EN and A1 connect to inner or bottom

layer with 6 mil hole size vias

RED traces = Top layer

BLUE traces = Bottom or inner layers

Address Pin connect to

VS, SDA, SCL, or GND

DNC = Do not connect. Leave these

pins floating

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INA2227

SBOSAL5 – JUNE 2025

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