INA228

Ultra-Precise Power/Energy/Charge Monitor

The INA228 is a ultra-precise power/energy/charge monitor from Texas Instruments. View the full INA228 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Official INA228 datasheet (PDF) — the source this page was extracted from.

Manufacturer

Texas Instruments

INA228 Key Specifications

Parameter	Value
Applications	Digital Power Monitor
Quiescent Current	640 µA
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 125°C (TA)
Package / Case	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Supplier Device Package	10-VSSOP
Input Voltage Range	-0.3V ~ 85V
Supply Voltage	2.7V ~ 5.5V

INA228 Overview

Part: INA228 — Texas Instruments

Type: Ultra-Precise Power/Energy/Charge Monitor

Description: An 85-V, 20-bit, ultra-precise digital power monitor with an I2C interface, designed for current-sensing applications with ±1 μV maximum offset voltage, ±0.05% maximum gain error, and a wide -0.3 V to +85 V common-mode range.

Operating Conditions:

Supply voltage: 2.7 V to 5.5 V
Operating temperature: -40 °C to +125 °C
Common-mode input range: -0.3 V to 85 V
Bus voltage input range: 0 V to 85 V

Absolute Maximum Ratings:

Max supply voltage: 6 V
Max junction temperature: 150 °C
Max storage temperature: 150 °C

Key Specs:

ADC resolution: 20 bits
Shunt offset voltage: ±1 μV (max, V_CM = 48 V, T_CT > 280 μs)
Shunt offset voltage drift: ±10 nV/°C (max, T_A = -40°C to +125°C)
Shunt voltage gain error: ±0.05% (max, V_CM = 24 V)
Common-mode rejection: 154 dB (min, -0.3 V < V_CM < 85 V, T_A = -40°C to +125°C)
Input bias current: 2.5 nA (max, V_CM = 85 V)
Power total measurement error: ±0.5% (max, T_A = -40°C to +125°C, at full scale)
Quiescent current: 750 μA (max, V_SENSE = 0 V)

Features:

High-resolution, 20-bit delta-sigma ADC
Current monitoring accuracy: ±1 μV offset, ±0.05% gain error
Wide common-mode range: -0.3 V to +85 V
Bus voltage sense input: 0 V to 85 V
Temperature sensor: ±1°C (maximum at 25°C)
Programmable conversion time and averaging
2.94-MHz high-speed I2C interface with 16 pin-selectable addresses
Operates from a 2.7-V to 5.5-V supply

Applications:

DC/DC converters and power inverters
Industrial battery packs
Power-over-ethernet (PoE)
Telecom equipment
Enterprise servers

Package:

VSSOP (10) - 3.00 mm × 3.00 mm

INA228 Features

High-resolution, 20-bit delta-sigma ADC
Current monitoring accuracy:
-Offset voltage: ±1 μV (maximum)
-Offset drift: ±0.01 μV/°C (maximum)
-Gain error: ±0.05% (maximum)
-Gain error drift: ±20 ppm/°C (maximum)
-Common mode rejection: 154 dB (minimum)
Power monitoring accuracy:
-0.5% full scale, -40°C to +125°C (maximum)
Energy and charge accuracy:
-1.0% full scale (maximum)
Fast alert response: 75 μs
Wide common-mode range: -0.3 V to +85 V
Bus voltage sense input: 0 V to 85 V
Shunt full-scale differential range: ±163.84 mV / ±40.96 mV
Input bias current: 2.5 nA (maximum)
Temperature sensor: ±1°C (maximum at 25°C)
Programmable resistor temperature compensation
Programmable conversion time and averaging
2.94-MHz high-speed I 2 C interface with 16 pinselectable addresses
Operates from a 2.7-V to 5.5-V supply:
-Operational current: 640 μA (typical)
-Shutdown current: 5 μA (maximum)

INA228 Applications

INA228 Pin Configuration

Figure 5-1. DGS Package 10-Pin VSSOP Top View

Table 5-1. Pin Functions

PIN	PIN	TYPE	DESCRIPTION
NO.	NAME	TYPE	DESCRIPTION
1	A1	Digital input	I 2 C address pin. Connect to GND, SCL, SDA, or VS.
2	A0	Digital input	I 2 C address pin. Connect to GND, SCL, SDA, or VS.
3	ALERT	Digital output	Open-drain alert output, default state is active low.
4	SDA	Digital input/output	Open-drain bidirectional I 2 C data.
5	SCL	Digital input	I 2 C clock input.
6	VS	Power supply	Power supply, 2.7 V to 5.5 V.
7	GND	Ground	Ground.
8	VBUS	Analog input	Bus voltage input.
9	IN-	Analog input	Negative input to the device. For high-side applications, connect to load side of sense resistor. For low-side applications, connect to ground side of sense resistor.
10	IN+	Analog input	Positive input to the device. For high-side applications, connect to power supply side of sense resistor. For low-side applications, connect to load side of sense resistor.

INA228 Electrical Characteristics

at T A = 25 °C, V S = 3.3 V, V SENSE = VIN+ - VIN- = 0 V, V CM = V IN- = 48 V (unless otherwise noted)

	PARAMETER	TEST CONDITIONS	MIN	TYP	MAX	UNIT
INPUT
V CM	Common-mode input range	T A = -40°C to +125°C	-0.3		85	V
V VBUS	Bus voltage input range		0		85	V
CMRR	Common-mode rejection	-0.3 V < V CM < 85 V, T A = -40°C to +125°C	154	170		dB
	Shunt voltage input range	T A = -40°C to +125°C, ADCRANGE = 0	-163.84		163.84	mV
V DIFF		T A = -40°C to +125°C, ADCRANGE = 1	-40.96		40.96	mV
V		V CM = 48 V, T CT > 280 μs		±0.3	±1	μV
os	Shunt offset voltage	V CM = 0 V, T CT > 280 μs		±0.3	±1	μV
dV os /dT	Shunt offset voltage drift	T A = -40°C to +125°C		±2	±10	nV/°C
PSRR	Shunt offset voltage vs power supply	V S = 2.7 V to 5.5 V, T A = -40°C to +125°C		±0.05	±0.5	μV/V
V os_bus	V BUS offset voltage	V BUS = 20 mV		±1	±2.5	mV
dV os /dT	V BUS offset voltage drift	T A = -40°C to +125°C		±4	±20	μV/°C
PSRR	V BUS offset voltage vs power supply	V S = 2.7 V to 5.5 V		±0.25		mV/V
I B	Input bias current	Either input, IN+ or IN-, V CM = 85 V		0.1	2.5	nA
Z VBUS	VBUS pin input impedance	Active mode	0.8	1	1.2	MΩ
I VBUS	VBUS pin leakage current	Shutdown mode, V BUS = 85 V		10		nA
R DIFF	Input differential impedance	Active mode, V IN+ - V IN- < 164 mV		92		kΩ
DC	ACCURACY
G SERR	Shunt voltage gain error	V CM = 24 V		±0.01	±0.05	%
G S_DRFT	Shunt voltage gain error drift				±20	ppm/°C
G BERR	V BUS voltage gain error			±0.01	±0.05	%
G B_DRFT	V BUS voltage gain error drift				±20	ppm/°C
P TME	Power total measurement error (TME)	T A = -40°C to +125°C, at full scale			±0.5	%
E TME	Energy and charge TME ADC resolution	at full scale power		20	±1	% Bits
	1 LSB step size	Shunt voltage, ADCRANGE = 0 Shunt voltage, ADCRANGE = 1 voltage Bus Temperature Conversion time field = 0h		312.5 78.125 195.3125 7.8125 50		nV nV μV m°C
T CT	ADC conversion-time (1)	Conversion time field = 1h Conversion time field = 2h Conversion time field = 3h Conversion time field = 4h Conversion time field = 5h Conversion time field = 6h Conversion time field = 7h		84 150 280 540 1052 2074 4120		μs m%
INL DNL Differential	Integral Non-Linearity Non-Linearity			±2 0.2		LSB
CLOCK SOURCE
F OSC	Internal oscillator frequency			1		MHz
F	Internal oscillator frequency tolerance	T A = 25°C			±0.5	%
OSC_TOL		T A = -40°C to +125°C			±1	%

INA228 Absolute Maximum Ratings

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

		MIN	MAX	UNIT
V S	Supply voltage		6	V
V IN+ , V IN- (2)	Differential (V IN+ ) - (V IN- )	-40	40	V
V IN+ , V IN- (2)	Common-mode	-0.3	85	V
V VBUS		-0.3	85	V
V ALERT	ALERT	-0.3	V S + 0.3	V
V IO	SDA, SCL	-0.3	6	V
I IN	Input current into any pin		5	mA
I OUT	Digital output current		10	mA
T J	Junction temperature		150	°C
T stg	Storage temperature	-65	150	°C

(2) VIN+ and VIN- are the voltages at the IN+ and IN- pins, respectively.

INA228 Recommended Operating Conditions

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

		MIN	MAX	UNIT
V CM	Common-mode input range	-0.3	85	V
V S	Operating supply range	2.7	5.5	V
T A	Ambient temperature	-40	125	°C

INA228 Thermal Information

THERMAL METRIC (1)	THERMAL METRIC (1)	INA228 DGS (VSSOP) 10 PINS	UNIT
R θJA	Junction-to-ambient thermal resistance	177.6	°C/W
R θJC(top)	Junction-to-case (top) thermal resistance	66.4	°C/W
R θJB	Junction-to-board thermal resistance	99.5	°C/W
Ψ JT	Junction-to-top characterization parameter	9.7	°C/W
Y JB	Junction-to-board characterization parameter	97.6	°C/W
R θJC(bot)	Junction-to-case (bottom) thermal resistance	N/A	°C/W

INA228 Typical Application

The low offset voltage and low input bias current of the INA228 allow accurate monitoring of a wide range of currents. To accurately monitor currents with high resolution, select the value of the shunt resistor so that the resulting sense voltage is close to the maximum allowable differential input voltage range (either ±163.84 mV or ±40.96 mV, depending on register settings). The circuit for monitoring currents in a high-side configuration is shown in Figure 8-2.

Figure 8-2. INA228 High-Side Sensing Application Diagram

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
INA228AIDGSR	Texas Instruments	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

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