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Texas Instruments INA3221AIRGVT
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- Part No.:
- INA3221AIRGVT
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
INA3221AIRGVT.pdf
- Description:
- IC CURRENT/VOLT MON 0.25% 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,180
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Product details
Overview
INA3221AIRGVT from Texas Instruments is a triple-channel, high-side current and bus voltage monitor IC with I²C/SMBus interface, sensing shunt voltages up to ±163.84 mV and bus voltages from 0 V to 26 V, delivering 13-bit resolution, ±80 µV shunt offset, and 0.25% gain error - deployed in multi-rail power monitoring for servers and telecom power supplies.
For engineers reviewing the INA3221AIRGVT datasheet, INA3221AIRGVT pinout, INA3221AIRGVT application, or INA3221AIRGVT equivalent, this device supports programmable averaging, four I²C addresses, critical/warning alerts per channel, and operates from 2.7 V to 5.5 V across –40°C to +125°C - key for precision rail validation and fault detection in dense power systems.
Technical Context
The INA3221AIRGVT integrates three independent measurement channels, each simultaneously acquiring shunt voltage (differential IN+–IN−) and bus voltage (IN− to GND), with configurable conversion timing (140 µs to 9.07 ms) and averaging (1× to 1024×). Its ADC uses a single 13-bit SAR architecture shared across all channels, time-multiplexed per configuration mode.
Alert logic is fully programmable: Critical alerts trigger on instantaneous shunt over-limit per channel or summed shunt voltage; Warning alerts respond to averaged shunt values; Power Valid (PV) monitors bus voltage sequencing against user-defined upper/lower thresholds; Timing Control (TC) detects channel-1 bus ramp-up past 1.2 V - all via open-drain outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bus voltage range | 0 V to 26 V - enables direct monitoring of 12 V, 24 V, and intermediate rails without level-shifting. |
| Shunt voltage range | ±163.84 mV - supports high-accuracy current sensing with standard 1 mΩ–10 mΩ shunts at up to ±16 A. |
| ADC resolution | 13 bits - provides 40 µV LSB for shunt and 8 mV LSB for bus measurements, enabling sub-1% full-scale error. |
| Offset voltage (shunt) | ±80 µV max - ensures ≤0.5% current measurement error at 100 mV shunt drop, critical for low-current standby monitoring. |
| Gain error | 0.25% max - guarantees consistent scaling across temperature (–40°C to +125°C) and supply (2.7–5.5 V). |
| Supply current | 350 µA typical - allows continuous monitoring in always-on subsystems without significant power penalty. |
| I²C address options | 4 programmable addresses (via A0 pin) - permits up to four INA3221AIRGVT devices on one bus for scalable multi-board monitoring. |
Pinout & Package
VQFN-16 (RGV) package, 4.00 mm × 4.00 mm, thermally enhanced with exposed thermal pad (to be connected to GND or left floating per layout guidelines).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+1, IN−1 IN+2, IN−2 IN+3, IN−3 |
Analog differential inputs per channel | Connect across shunt resistors; IN− also serves as local bus voltage reference (0 V to 26 V common-mode). |
| VS | Analog power supply | 2.7 V to 5.5 V supply for core logic and ADC - independent of monitored bus voltages. |
| GND | Analog ground reference | Return path for VS and internal ADC; must be tied to system analog ground for accuracy. |
| SDA, SCL | I²C bidirectional data/clock | Open-drain, SMBus-compatible; support up to 400 kHz standard-mode operation. |
| A0 | I²C address select | Digital input setting one of four device addresses (GND/VS/SCL/SDA) - no external pull-up required. |
| Critical, Warning, PV, TC | Open-drain alert outputs | Assert low on programmed fault conditions; require external pull-ups to VPU (PV) or system rail (others). |
| VPU | Power-valid pull-up supply | Provides bias for PV output high-state; decouples PV logic level from system supply domain. |
| Thermal Pad | Exposed die attach pad | Improves thermal resistance (RθJB = 14.7 °C/W); recommended connection to GND plane for reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent channel monitoring | Simultaneous shunt + bus measurement per channel enables real-time per-rail health assessment without multiplexer overhead. |
| Programmable averaging (1×–1024×) | Reduces noise-induced false alerts in noisy power environments while maintaining responsiveness via selectable conversion time. |
| Critical + Warning dual-threshold alerts | Allows tiered fault response: immediate shutdown on Critical, throttling or logging on Warning - improving system robustness. |
| Power Valid (PV) sequencing monitor | Verifies all enabled rails exceed upper threshold (default 10 V) before asserting PV high - essential for FPGA/CPU power sequencing compliance. |
| Timing Control (TC) ramp detection | Triggers on Channel 1 bus reaching 1.2 V - provides hardware-based timing reference for boot sequence validation. |
Applications
| Server Power Rail Monitoring | Telecom PSU Health Management |
|---|---|
|
Use Scenario: Real-time monitoring of +12 V, +5 V, and +3.3 V rails in 1U server backplanes with dynamic load changes. IC Role / Device Role / Timing Role: Triple-channel current/voltage monitor providing synchronized shunt and bus readings every 1.21 ms (CT=100) for closed-loop telemetry. Use Value: Detects subtle current drift (<100 mA) and bus droop (>50 mV) before thermal runaway or brownout, enabling predictive maintenance. |
Use Scenario: Continuous supervision of redundant -48 V DC distribution in LTE base station power shelves. IC Role / Device Role / Timing Role: High-side monitor on each output rail, using PV alert to validate all rails before enabling downstream converters. Use Value: Prevents hot-swap failures by ensuring all rails reach 42 V before enabling load switches - enforced via programmable PV lower limit (default 9 V). |
| Battery Charger Current Balancing | Data Center Rack PDU Telemetry |
|
Use Scenario: Parallel Li-ion charging modules where per-cell-pack current matching is required for safety certification. IC Role / Device Role / Timing Role: Measures shunt voltage across three independent charge paths, using Warning alert to flag >5% current imbalance. Use Value: Enables automatic feedback to charger controllers to trim individual CC/CV stages - reducing pack-level SoC variance by ≥30%. |
Use Scenario: Smart rack PDU with per-outlet energy metering and overload protection across 24 outlets. IC Role / Device Role / Timing Role: One INA3221AIRGVT per 8-outlet group, aggregating shunt sums via SCC bits to trigger Critical alert on total group current >30 A. Use Value: Eliminates need for external summing op-amps; hardware-based overload detection reduces firmware latency from 100 ms to <200 µs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current and voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIRWVR | Bidirectional sensing, 36 V bus range, 16-bit resolution, higher quiescent current (600 µA), no PV/TC alerts. | Better suited for motor control or battery stack monitoring requiring reverse-current detection and extended voltage range. | Select when bidirectional current flow or >26 V bus monitoring is required; not drop-in due to different alert architecture and register map. |
| INA219AIDR | Single-channel, 26 V bus, 12-bit resolution, integrated power calculation, no programmable averaging or multi-alert outputs. | Targeted at cost-sensitive, space-constrained designs like portable electronics where only one rail needs monitoring. | Choose for simpler BOMs and reduced firmware complexity; lacks triple-channel capability and PV/TC sequencing features of INA3221AIRGVT. |
Compared with INA226AIRWVR and INA219AIDR, the INA3221AIRGVT uniquely delivers triple-channel synchronized monitoring with dedicated power sequencing (PV/TC) and dual-threshold alerting - making it the only option among the three that supports hardware-enforced multi-rail startup validation in telecom and server platforms.
Availability
INA3221AIRGVT is available at Aetrix Electronics and suitable for server power management, telecom power shelf supervision, and data center PDU telemetry requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for INA3221AIRGVT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.
The INA3221AIRGVT belongs to TI's high-accuracy current-sense monitor product line, engineered specifically for multi-rail power system visibility in data centers, communications infrastructure, and industrial automation - emphasizing hardware-based fault detection and sequencing integrity.
FAQ
What is the maximum bus voltage the INA3221AIRGVT can monitor?
The INA3221AIRGVT supports a bus voltage input range of 0 V to 26 V. This is an absolute maximum rating - applying more than 26 V to any IN− pin risks permanent damage. The device's internal ADC uses an 8 mV LSB, yielding a theoretical full-scale value of 32.76 V in register space, but physical pin voltage must remain ≤26 V at all times. The INA3221AIRGVT maintains accuracy across this full range with 110–120 dB common-mode rejection.
Does the INA3221AIRGVT support bidirectional current sensing?
No, the INA3221AIRGVT is unidirectional only. It measures shunt voltage with polarity referenced to IN−, meaning it reports positive current flow from IN+ to IN−. It cannot detect reverse current or negative shunt voltages beyond its specified ±163.84 mV range. For bidirectional applications, TI recommends the INA226AIRWVR, which explicitly supports ±327.68 mV shunt input and signed current reporting.
How does the Power Valid (PV) alert function work on the INA3221AIRGVT?
The PV alert on the INA3221AIRGVT asserts high only after all enabled channels' bus voltages exceed the programmed Power-Valid Upper-Limit (default 10 V). It remains high until any enabled channel drops below the Power-Valid Lower-Limit (default 9 V), at which point PV pulls low. The PV output is open-drain and requires an external pull-up to VPU; its logic level is decoupled from VS, allowing interfacing with higher-voltage supervisor circuits.
Can the INA3221AIRGVT measure current on negative-grounded rails?
Yes - the INA3221AIRGVT supports high-side sensing on rails referenced to system ground. Its IN− pins serve as the local bus voltage reference, so connecting IN− to the load side of the shunt (i.e., between shunt and ground) enables direct ground-referenced bus measurement. The device tolerates IN− down to –0.3 V, permitting limited negative transient handling, but sustained negative bus operation is not supported.
What is the purpose of the Timing Control (TC) pin on the INA3221AIRGVT?
The TC pin on the INA3221AIRGVT is an open-drain output that asserts low when Channel 1's bus voltage rises above 1.2 V during power-up. It provides a hardware timing reference for system sequencers or FPGAs to synchronize downstream enable signals. Unlike Critical or Warning alerts, TC is fixed-threshold and channel-specific - it cannot be reprogrammed, and its activation depends solely on Channel 1 bus ramp rate and magnitude.
INA3221AIRGVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current/Voltage Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±0.25%
- Voltage - Input:
- 0V ~ 26V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (4x4)
INA3221AIRGVT FAQ
1.How can I place an order for INA3221AIRGVT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA3221AIRGVT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA3221AIRGVT reliable?
The price and inventory of INA3221AIRGVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA3221AIRGVT is usually 5 days.
3.What payment methods are accepted for INA3221AIRGVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA3221AIRGVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA3221AIRGVT?
INA3221AIRGVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA3221AIRGVT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA3221AIRGVT?
For technical support, including INA3221AIRGVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA3221AIRGVT requirements.
6.How does Aetrix verify that INA3221AIRGVT is sourced from the original manufacturer or authorized distributors?
All INA3221AIRGVT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA3221AIRGVT meets industry standards.
7.What is the process for return or replacement of INA3221AIRGVT?
All INA3221AIRGVT units undergo pre-shipment inspection (PSI). If there is an issue with INA3221AIRGVT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA3221AIRGVT part is unused and in its original packaging.
Return procedure for INA3221AIRGVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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