INA3221AIRGVR

Three-Channel, High-Side Current and Bus Voltage Monitor

The INA3221AIRGVR is a three-channel, high-side current and bus voltage monitor from Texas Instruments. View the full INA3221AIRGVR datasheet below including key specifications, pinout, electrical characteristics, absolute maximum ratings.

Manufacturer

Texas Instruments

Key Specifications

Parameter	Value
Gain Error	0.25% (Max)
Offset Voltage	±80 μV (Max)
Quiescent Current	350 μA (Typ), 450 μA (Max)
Number Of Channels	3
Package Dimensions	4.00mm x 4.00mm
Supply Voltage Range	2.7V to 5.5V
Bus Voltage Sense Range	0V to 26V
Communication Interface	I2C, SMBus
Operating Temperature Range	-40°C to +125°C

Overview

Part: INA3221 — Texas Instruments

Type: Three-Channel, High-Side Current and Bus Voltage Monitor

Description: The INA3221 is a three-channel, high-side current and bus voltage monitor with an I2C- and SMBUS-compatible interface, capable of sensing bus voltages from 0V to 26V and operating from a 2.7V to 5.5V supply.

Operating Conditions:

Supply voltage: 2.7V to 5.5V
Operating temperature: -40 to +125 °C
Bus voltage range: 0V to 26V

Absolute Maximum Ratings:

Max supply voltage: 6 V
Max continuous current: 10 mA (open-drain digital output)
Max junction/storage temperature: 150 °C

Key Specs:

Bus voltage range: 0V to 26V
Offset voltage: ±80μV (maximum)
Gain error: 0.25% (maximum)
Supply current consumption: 350 μA (typical)
Differential input voltage: -26V to 26V
Common-mode input voltage: -0.3V to 26V

Features:

Reports shunt and bus voltage
Configurable averaging options
Four programmable addresses
Programmable alert and warning outputs
I2C- and SMBUS-compatible interface
Critical alert, warning alert, power valid alert, timing control alert outputs

Applications:

Computers
Power management
Telecom equipment
Battery chargers
Power supplies
Test equipment

Package:

VQFN (16) 4.00mm x 4.00mm

Pin Configuration

INA3221AIRGVR Pinout

Package: QFN-16-EP (4×4 mm)

Pin Number	Pin Name	Type	Description
1	IN-3	Analog Input	Connect to load side of channel 3 shunt resistor. Bus voltage measured from this pin to ground.
2	IN+3	Analog Input	Connect to supply side of channel 3 shunt resistor.
3	GND	Analog	Ground
4	VS	Analog	Power supply, 2.7 V to 5.5 V
5	A0	Digital Input	Address pin. Connect to GND, SCL, SDA, or VS.
6	SCL	Digital Input	Serial bus clock line; open-drain input.
7	SDA	Digital I/O	Serial bus data line; open-drain input/output.
8	Warning	Digital Output	Averaged measurement warning alert; open-drain output.
9	Critical	Digital Output	Conversion-triggered critical alert; open-drain output.
10	PV	Digital Output	Power valid alert; open-drain output.
11	IN-1	Analog Input	Connect to load side of channel 1 shunt resistor. Bus voltage measured from this pin to ground.
12	IN+1	Analog Input	Connect to supply side of channel 1 shunt resistor.
13	TC	Digital Output	Timing control alert; open-drain output.
14	IN-2	Analog Input	Connect to load side of channel 2 shunt resistor. Bus voltage measured from this pin to ground.
15	IN+2	Analog Input	Connect to supply side of channel 2 shunt resistor.
16	VPU	Analog Input	Pull-up supply voltage used to bias power valid output circuitry.

Notes

All alert outputs (Critical, PV, TC, Warning) are open-drain outputs.
SCL and SDA are open-drain I/O lines for I²C communication.
The device has three independent current/voltage measurement channels (channels 1, 2, and 3).
Pin numbers extracted from the QFN-16 top-view diagram and matched with the pin functions table.

Electrical Characteristics

at TA = 25°C, VS = 3.3 V, VIN+ = 12 V, VSHUNT = (VIN+) - (VIN-) = 0 mV, and VBUS = VIN= 12 V (unless otherwise noted)

	PARAMETER		TEST CONDITIONS	MIN	TYP	MAX	UNIT
INPUT
V SHUNT	Shunt voltage input			-163.84		163.8	mV
V BUS	Bus voltage input			0		26	V
CMR	Common-mode rejection		V IN+ = 0 V to +26 V	110	120 ±40	±80	dB μ V
V OS	Shunt offset voltage, RTI (1)		T A = -40°C to +125°C		0.1	0.5	μ V/°C
PSRR			vs power supply, V S = 2.7 V to 5.5 V		15		μ V/V
V OS	Bus offset voltage, RTI (1)		T A = -40°C to +125°C		±8	±16 80	mV μ V/°C
PSRR			vs power supply		0.5		mV/V
I IN+	Input bias current at IN+				10		μ A
I IN-	Input bias current at IN-				10 \	\	670
	Input leakage (2)		(IN+ pin) + (IN- pin), power-down mode		0.1	0.5	μ A
DC	ACCURACY ADC native resolution		Shunt voltage		13 40		Bits μ V
	1-LSB step size Shunt voltage gain error		Bus voltage		8 0.1%	0.25%	mV
	Bus voltage gain error		T A = -40°C to +125°C		10 0.1%	50 0.25%	ppm/°C
	Differential		T A = -40°C to +125°C		10	50	ppm/°C
DNL	nonlinearity		CT bit = 000 CT bit = 001		±0.1 140 204	154 224	LSB
			CT bit = 010		332	365	μs
t CONVERT	ADC conversion time		CT bit = 011 CT bit = 100		588 1.1	646 1.21
			CT bit = 110 CT bit = 111		4.156 8.244	4.572 9.068	ms
SMBus
	SMBus timeout (3)				28	35	ms
DIGITAL	INPUT/OUTPUT
C I	Input capacitance				3		pF
	Leakage input current	Leakage input current	0 V ≤ V IN ≤ V S		0.1	1	μ A
V IH	High-level input voltage	High-level input voltage		0.7 (V S )		6	V
V IL	Low-level input voltage	Low-level input voltage		-0.5		0.3 (V S )	V
	Low-level output	SDA, critical, warning, PV	V S > +2.7 V, I OL = 3 mA	0		0.4	V
V OL	voltage	TC	V S > +2.7 V, I OL = 1.2 mA	0		0.4
V hys	Hysteresis voltage				500		mV
POWER SUPPLY					350	450	μ A
	Quiescent current		Power-down mode		0.5	2
Power-on reset	threshold	threshold			2		V

Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)

			MIN	MAX	UNIT
Voltage	Supply, V S	Supply, V S		6	V
Analog inputs		Differential (V IN+ ) - (V IN- ) (2)	-26	26	V
Analog inputs		Common-mode (V IN+ ) + (V IN- ) / 2	-0.3	26	V
Analog inputs	VPU	VPU		26	V
Digital outputs	Critical, warning, power valid	Critical, warning, power valid		6	V
Digital outputs	Timing control	Timing control		26	V
Serial bus	Data line, SDA	Data line, SDA	(GND - 0.3)	6	V
Serial bus	Clock line, SCL	Clock line, SCL	(GND - 0.3)	(V S + 0.3)	V
Current	Input, into any pin	Input, into any pin		5	mA
Current	Open-drain, digital output	Open-drain, digital output		10	mA
Temperature	Operating, T A	Operating, T A	-40	125	°C
Temperature	Junction, T J	Junction, T J		150	°C
Temperature	Storage, T stg	Storage, T stg	-65	150	°C

Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

	MIN	NOM	MAX	UNIT
Operating supply voltage	2.7		5.5	V
Operating temperature, T A	-40		125	°C

Thermal Information

THERMAL METRIC (1)		INA3221 RGV (VQFN) 16 PINS	UNIT
R θ JA	Junction-to-ambient thermal resistance	36.5	°C/W
R θ JC(top)	Junction-to-case (top) thermal resistance	42.7	°C/W
R θ JB	Junction-to-board thermal resistance	14.7	°C/W
ψ JT	Junction-to-top characterization parameter	0.5	°C/W
ψ JB	Junction-to-board characterization parameter	14.8	°C/W
R θ JC(bot)	Junction-to-case (bottom) thermal resistance	3.3	°C/W

Typical Application

INA3221 is a three-channel current and bus voltage monitor with I 2 C/SMBUS-compatible interface. It features programmable conversion times and averaging modes and offers both critical and warning alerts to detect multiple programmable out-of-range conditions for each channel.

Ordering Information

MPN	Package	Temperature Range	Packing
INA3221AIRGVR	VQFN (16)	-40°C to +125°C	null

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
INA3221	Texas Instruments	—

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