INA226

Part: INA226 Type: 16-Bit I2C Output Current, Voltage, and Power Monitor

Key Specs:

• Senses bus voltages: 0V to 36V
• Gain error: 0.1% (maximum)
• Offset: 10μV (maximum)
• Power supply voltage: 2.7V to 5.5V
• Supply current: 330μA (typical)
• Operating temperature range: –40°C to 125°C

Features:

• High-side or low-side sensing
• Reports current, voltage, and power
• Configurable averaging options
• 16 programmable addresses
• I2C™- or SMBUS-compatible interface
• 16-bit output

Applications:

• Rack servers
• Wireless infrastructure
• High performance computing
• Power management
• Battery cell monitors and balancers
• Power Supplies
• Test Equipment

Package:

• VSSOP (10): 3.00mm × 4.90mm

• Senses bus voltages from 0V to 36V
• High-side or low-side sensing
• Reports current, voltage, and power
• High accuracy:
  • Gain error: 0.1% (maximum)
  • Offset: 10μV (maximum)
• Configurable averaging options
• 16 programmable addresses
• Operates from 2.7V to 5.5V power supply
• 10-pin DGS (VSSOP) package

• Rack servers
• Wireless infrastructure
• High performance computing
• Power management
• Battery cell monitors and balancers
• Power Supplies
• Test Equipment

Figure 4-1. DGS Package 10-Pin VSSOP Top View

Table 4-1. Pin Functions

| | PIN | |-------|-----|----------------|---------------------------------------------------------------------------------------------------------|--|--|--|--| | NAME | NO. | Type | DESCRIPTION | | A0 | 2 | Digital input | Address pin. Connect to GND, SCL, SDA, or VS. Table 6-2 shows pin settings and corresponding addresses. | | A1 | 1 | Digital input | Address pin. Connect to GND, SCL, SDA, or VS. Table 6-2 shows pin settings and corresponding addresses. | | Alert | 3 | Digital output | Multi-functional alert, open-drain output. | | GND | 7 | Analog | Ground. | | IN+ | 10 | Analog input | Connect to supply side of shunt resistor. | | IN– | 9 | Analog input | Connect to load side of shunt resistor. | | SCL | 5 | Digital input | Serial bus clock line, open-drain input. | | SDA | 4 | Digital I/O | Serial bus data line, open-drain input/output. | | VBUS | 8 | Analog input | Bus voltage input. | | VS | 6 | Analog | Power supply, 2.7 V to 5.5 V. |

| | TA = 25°C, VVS = 3.3 V, VIN+ = 12 V, VSENSE = (VIN+ – VIN–) = 0 mV and VVBUS = 12 V, unless otherwise noted
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |--------------|--------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------|----------|-------|---------|--------|--| | INPUT | | | Shunt voltage input range | | –81.9175 | | 81.92 | mV | | | Bus voltage input range(1) | | 0 | | 36 | V | | CMRR | Common-mode rejection | 0 V ≤ VIN+ ≤ 36 V | 126 | 140 | | dB | | VOS | Shunt offset voltage, RTI(2) | | | ±2.5 | ±10 | μV | | | Shunt offset voltage, RTI(2) vs | –40°C ≤ TA ≤ 125°C | | 0.02 | 0.1 | μV/°C | | PSRR | temperature
Shunt offset voltage, RTI(2) vs Power | 2.7 V ≤ VS ≤ 5.5 V | | ±2.5 | | μV/V | | | supply | | VOS | Bus offset voltage, RTI(2) | | | ±1.25 | ±7.5 | mV | | | Bus offset voltage, RTI(2) vs temperature | –40°C ≤ TA ≤ 125°C | | 10 | 40 | μV/°C | | PSRR | Bus offset voltage, RTI(2) vs power supply | | | ±0.5 | | mV/V | | IB | Input bias current (IIN+, IIN– pins) | | | 0.1 | | nA | | | VBUS input impedance | | | 830 | | kΩ | | | Input leakage (3) | (IN+ pin) + (IN– pin),
Power-down mode | | 0.1 | 0.5 | μA | | DC ACCURACY | | | ADC native resolution | | | 16 | | Bits | | | | Shunt voltage | | 2.5 | | μV | | | 1 LSB step size | Bus voltage | | 1.25 | | mV | | | Shunt voltage gain error | | | 0.02% | 0.1% | | | Shunt voltage gain error vs temperature | –40°C ≤ TA ≤ 125°C | | 10 | 50 | ppm/°C | | | Bus voltage gain error | | | 0.02% | 0.1% | | | Bus voltage gain error vs temperature | –40°C ≤ TA ≤ 125°C | | 10 | 50 | ppm/°C | | | Differential nonlinearity | | | ±0.1 | | LSB | | | | CT bit = 000 | | 140 | 154 | | | | CT bit = 001 | | 204 | 224 | | | | | | | | μs | | | | CT bit = 010 | | 332 | 365 | | tCT | ADC conversion time | CT bit = 011 | | 588 | 646 | | | | CT bit = 100 | | 1.1 | 1.21 | | | | CT bit = 101 | | 2.116 | 2.328 | ms | | | | CT bit = 110 | | 4.156 | 4.572 | | | | CT bit = 111 | | 8.244 | 9.068 | | SMBus | | | SMBus timeout(4) | | | 28 | 35 | ms | | | DIGITAL INPUT/OUTPUT | | | Input capacitance | | | 3 | | pF | | | Leakage input current | 0 V ≤ VSCL ≤ VVS ,
0 V ≤ VSDA ≤ VVS,
0 V ≤ VAlert ≤ VVS ,
0 V ≤ VA0 ≤ VVS ,
0 V ≤ VA1 ≤ VVS | | 0.1 | 1 | μA | | VIH | High-level input voltage | | 0.7×VVS | | 6 | V | | VIL | Low-level input voltage | | –0.5 | | 0.3×VVS | V | | VOL | Low-level output voltage, SDA, Alert | IOL = 3 mA | 0 | | 0.4 | V | | | Hysteresis | | | 500 | | mV | | POWER SUPPLY | | | Operating supply range | | 2.7 | | 5.5 | V | | IQ | Quiescent current | | | 330 | 420 | μA | | | Quiescent current, power-down
(shutdown) mode | | | 0.5 | 2 | μA | Copyright © 2024 Texas Instruments Incorporated Submit Document Feedback 5

TA = 25°C, VVS = 3.3 V, VIN+ = 12 V, VSENSE = (VIN+ – VIN–) = 0 mV and VVBUS = 12 V, unless otherwise noted

• (1) While the input range is 36 V, the full-scale range of the ADC scaling is 40.96 V. See the Section 6.3.1. Do not apply more than 36 V.
• (2) RTI = Referred-to-input.
• (3) Input leakage is positive (current flowing into the pin) for the conditions shown at the top of this table. Negative leakage currents can occur under different input conditions.
• (4) SMBus timeout in the device resets the interface any time SCL is low for more than 28 ms.

6 Submit Document Feedback Copyright © 2024 Texas Instruments Incorporated

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

⁽¹⁾ Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.

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

| | | INA226 | |-----------|----------------------------------------------|-------------|------| | | THERMAL METRIC(1) | DGS (VSSOP) | UNIT | | | | 10 PINS | | RθJA | Junction-to-ambient thermal resistance | 144.6 | °C/W | | RθJC(top) | Junction-to-case (top) thermal resistance | 53.3 | °C/W | | RθJB | Junction-to-board thermal resistance | 80.4 | °C/W | | ΨJT | Junction-to-top characterization parameter | 3.5 | °C/W | | YJB | Junction-to-board characterization parameter | 78.9 | °C/W | | RθJC(bot) | Junction-to-case (bottom) thermal resistance | N/A | °C/W |

⁽¹⁾ For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application note.

Product Folder Links: INA226

⁽²⁾ IN+ and IN– can have a differential voltage between –40 V and 40 V. However, the voltage at these pins must not exceed the range –0.3 V to 40 V.

⁽²⁾ JEDEC document JEP157 states that 250V CDM allows safe manufacturing with a standard ESD control process.