INA3221-Q1 datasheet(37/45 Pages) TI1

Part #	INA3221-Q1

Description	Current and Voltage Monitor with Programmable Overcurrent Alerts

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Manufacturer	TI1 [Texas Instruments]

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IN 3

IN+3

GND

VS

IN+1

IN 1

PV

Critical

I

2C- and SMBUS-

Compatible Interface

Via to Ground Plane

Via to Power Plane

Connect to

bus power-

supply rail

Connect

to VPU

Supply

Bypass

Capacitor

Warning Output

To Bus Power Supply

To Load

To Bus Power

Supply

To Load

Critical

Output

Timing Control Output

37

INA3221-Q1

www.ti.com

SBOS776B – MARCH 2016 – REVISED MARCH 2016

Product Folder Links: INA3221-Q1

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10 Power Supply Recommendations

The input circuitry of the device can accurately measure signals on common-mode voltages beyond its power

supply voltage, VS. For example, the voltage applied to the VS power supply terminal can be 5 V, whereas the

load power-supply voltage being monitored (the common-mode voltage) on any one of the three channels can be

as high as 26 V. Note also that the device can withstand the full 0-V to 26-V range at the input terminals,

regardless of whether the device has power applied or not. Place the required power-supply bypass capacitors

as close as possible to the supply and ground terminals of the device to ensure stability. A typical value for this

supply bypass capacitor is 0.1

μF. Applications with noisy or high-impedance power supplies may require

additional decoupling capacitors to reject power-supply noise.

11 Layout

11.1 Layout Guidelines

Connect the input pins (IN+ and IN–) of all the used channels to the sensing resistor using a Kelvin connection or

a 4-wire connection. These connection techniques ensure 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.

11.2 Layout Example

Figure 55. Layout Example

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INA3221-Q1 Datasheet(PDF) 37 Page - Texas Instruments

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