INA3221

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

The INA3221 is a three-channel, high-side current and bus voltage monitor from Texas Instruments. View the full INA3221 datasheet below including electrical characteristics, absolute maximum ratings.

Manufacturer

Texas Instruments

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

RGV Package 16-Pin VQFN Top View

Pin Functions

PIN	PIN	I/O	DESCRIPTION
NAME	NO.	I/O	DESCRIPTION
A0	5	Digital input	Address pin. Connect to GND, SCL, SDA, or V S . 表 1 shows pin settings and corresponding addresses.
Critical	9	Digital output	Conversion-triggered critical alert; open-drain output.
GND	3	Analog	Ground
IN-1	11	Analog input	Connect to load side of the channel 1 shunt resistor. Bus voltage is the measurement from this pin to ground.
IN+1	12	Analog input	Connect to supply side of the channel 1 shunt resistor.
IN-2	14	Analog input	Connect to load side of the channel 2 shunt resistor. Bus voltage is the measurement from this pin to ground.
IN+2	15	Analog input	Connect to supply side of the channel 2 shunt resistor.
IN-3	1	Analog input	Connect to load side of the channel 3 shunt resistor. Bus voltage is the measurement from this pin to ground.
IN+3	2	Analog input	Connect to supply side of the channel 3 shunt resistor.
PV	10	Digital output	Power valid alert; open-drain output.
SCL	6	Digital input	Serial bus clock line; open-drain input.
SDA	7	Digital I/O	Serial bus data line; open-drain input/output.
TC	13	Digital output	Timing control alert; open-drain output.
VPU	16	Analog input	Pull-up supply voltage used to bias power valid output circuitry.
VS	4	Analog	Power supply, 2.7 V to 5.5 V.
Warning	8	Digital output	Averaged measurement warning alert; open-drain output.

Pin Functions

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.

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
INA3221AIRGVR	Texas Instruments	QFN-16-EP(4x4)

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