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Texas Instruments INA229AIDGST
- Part No.:
- INA229AIDGST
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA229AIDGST.pdf
- Description:
- IC OPAMP
- Quantity:
- Payment:
- Shipping:
Inventory:255
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Product details
Overview
INA229AIDGST from Texas Instruments is a 20-bit ultra-precise digital power/energy/charge monitor IC with SPI interface, designed for high-side and low-side current sensing across –0.3 V to +85 V common-mode voltage. It delivers ±1 µV shunt offset voltage, ±0.05% power measurement error (–40°C to +125°C), and 75 µs alert response - enabling accurate real-time monitoring in telecom power supplies and server VRMs.
For engineers reviewing the INA229AIDGST datasheet, INA229AIDGST pinout, INA229AIDGST application, or INA229AIDGST equivalent, key selection criteria include its ±163.84 mV shunt full-scale range, programmable 50 µs–4.12 ms ADC conversion time, integrated ±1°C temperature sensor, and 10-MHz SPI timing compliance - all critical for precision energy metering and closed-loop power management.
Technical Context
The INA229AIDGST integrates a 20-bit delta-sigma ADC with independent programmable conversion times per channel (shunt, bus, temperature) and up to 1024× averaging. Its high-voltage input multiplexer supports simultaneous shunt differential (±163.84 mV / ±40.96 mV), bus voltage (0–85 V), and die temperature (–40°C to +125°C) measurements.
Background calculation engine computes current, power, energy, and charge in real time without extending conversion latency; power accuracy remains ±0.5% full scale over temperature, while energy/charge accuracy holds at ±1.0% full scale. The device uses an internal ±1% oscillator and supports triggered or continuous-conversion modes via SPI register control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC resolution | 20-bit delta-sigma - enables 312.5 nV LSB step size for high dynamic-range mA-to-kA sensing |
| Shunt offset voltage | ±1 µV max - minimizes zero-current error, supporting sub-mA current detection with large shunts |
| Power measurement error | ±0.5% FS (–40°C to +125°C) - ensures stable accuracy across industrial thermal environments |
| Common-mode range | –0.3 V to +85 V - allows direct high-side sensing on 48 V telecom rails without level-shifting |
| SPI interface speed | 10 MHz - enables rapid register access and <75 µs alert-to-readout latency for fault response |
| Supply voltage | 2.7 V to 5.5 V - compatible with standard logic rails and isolated DC/DC bias supplies |
| Input bias current | 2.5 nA max - permits use of ≥10 kΩ RC filters and high-value shunts for microamp-level sensing |
Pinout & Package
The INA229AIDGST is housed in a 10-pin VSSOP package (3.00 mm × 3.00 mm), optimized for high-density PCB layouts and thermal performance (RθJA = 177.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, CS | SPI chip select | Active-low enable for multi-device SPI buses; supports daisy-chain or independent addressing |
| 2, MOSI | SPI data input | Accepts register write commands and configuration bits at up to 10 MHz clock rate |
| 3, ALERT | Open-drain fault indicator | Asserts on overvoltage, overcurrent, or temperature threshold breach; configurable via registers |
| 4, MISO | SPI data output | Push-pull output delivering measured values (current, power, energy) and status flags |
| 5, SCLK | SPI clock input | Drives synchronous data transfer; requires 40 ns min high/low pulse width per TI spec |
| 6, VS | Power supply | 2.7–5.5 V analog/digital rail; powers internal oscillator, ADC, and SPI interface |
| 7, GND | Analog/digital ground | Single ground reference for shunt, bus, and digital circuitry; requires low-impedance layout |
| 8, VBUS | Bus voltage sense | 0–85 V input referenced to GND; measures supply rail voltage for power calculation |
| 9, IN– | Shunt negative input | Connects to load side (high-side) or ground side (low-side); defines shunt differential reference |
| 10, IN+ | Shunt positive input | Connects to supply side (high-side) or load side (low-side); completes 2-terminal shunt interface |
Key Features
| Feature | Design Value |
|---|---|
| Programmable ADC conversion time | Selectable from 50 µs to 4.12 ms per channel - balances noise rejection vs. update rate for PoE or server applications |
| Integrated temperature sensor | ±1°C accuracy at 25°C - enables on-die thermal compensation of shunt gain/offset drift without external sensors |
| Shunt full-scale dual range | ±163.84 mV or ±40.96 mV - supports wide current ranges (mA to kA) with single device and no hardware change |
| Background calculation engine | Real-time current/power/energy/charge computation - eliminates host MCU overhead and ensures deterministic timing |
| Low input bias current | 2.5 nA max - enables stable operation with high-impedance RC filters and >1 Ω shunts for µA-level precision |
Applications
| Telecom Power Monitoring | Enterprise Server VRM |
|---|---|
|
Use Scenario: Real-time power telemetry in 48 V distributed power architecture for BTS base stations. IC Role / Device Role / Timing Role: Measures shunt current and bus voltage simultaneously to compute instantaneous power and accumulated energy for thermal derating and predictive maintenance. Use Value: ±0.5% power accuracy over –40°C to +125°C ensures reliable reporting under outdoor cabinet temperature swings without recalibration. |
Use Scenario: Per-phase current and power monitoring in multi-phase CPU/GPU VRMs for AI accelerators. IC Role / Device Role / Timing Role: High-speed 75 µs alert response triggers immediate phase shedding or throttling upon overcurrent detection. Use Value: 20-bit resolution and ±1 µV offset enable detection of <10 mA load transients amid 100+ A nominal currents. |
| Industrial Battery Pack Management | Power-over-Ethernet (PoE) PSE |
|
Use Scenario: Coulomb counting and state-of-charge estimation in 24–60 V Li-ion battery stacks for AGVs. IC Role / Device Role / Timing Role: Accumulates charge (Q = ∫i·dt) and energy (E = ∫p·dt) continuously in background using internal timer and calibrated shunt. Use Value: ±1.0% full-scale energy accuracy enables <2% SoC error over full discharge cycle without periodic reset. |
Use Scenario: Class 8 PoE++ power sourcing equipment with 90 W delivery and real-time load classification. IC Role / Device Role / Timing Role: Monitors both input bus voltage and output shunt current to enforce IEEE 802.3bt power budgeting and fault shutdown. Use Value: 85 V common-mode range supports direct sensing on PoE HDBaseT-style 57 V rails without external attenuators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital power monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIDGSR | 16-bit ADC, ±10 µV offset, ±0.2% power error, 1-MHz SPI, no energy/charge accumulation | Limited to basic current/voltage monitoring; unsuitable for precise energy metering or long-term charge tracking | Choose for cost-sensitive, lower-accuracy applications where background energy calculation is unnecessary |
| MAX40080FAUA+ | 20-bit ADC, ±2 µV offset, ±0.3% power error, I²C interface only, no temperature sensor | Requires I²C bus; lacks integrated thermal sensing for drift compensation in wide-temperature deployments | Prefer when I²C infrastructure exists and ambient temperature stability is assured or externally managed |
Compared with INA229AIDGST, the INA226AIDGSR trades resolution and computational capability for lower cost and simpler interface, while the MAX40080FAUA+ matches bit depth but omits temperature sensing and energy accumulation - making INA229AIDGST uniquely suited for autonomous, high-accuracy, multi-parameter power telemetry in thermally variable environments.
Availability
INA229AIDGST is available at Aetrix Electronics and suitable for telecom equipment, enterprise servers, and industrial battery packs requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for INA229AIDGST 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 chain and power management ICs.
The INA229 belongs to TI's ultra-precise current-sense monitor product line, engineered specifically for systems demanding simultaneous high-accuracy current, voltage, power, energy, and charge measurement without host processor intervention.
FAQ
What is the maximum common-mode voltage supported by the INA229AIDGST?
The INA229AIDGST supports a common-mode input range of –0.3 V to +85 V, enabling direct high-side sensing on 48 V telecom rails and 60 V industrial battery systems without external level-shifting circuitry. This specification is guaranteed across the full operating temperature range of –40°C to +125°C and is validated per TI's absolute maximum ratings and electrical characteristics tables.
Does the INA229AIDGST integrate an internal oscillator, and what is its accuracy?
Yes, the INA229AIDGST includes a precision integrated oscillator rated at 1 MHz ±1% over –40°C to +125°C. This oscillator drives the ADC and timing-critical functions such as energy/charge accumulation and alert response, eliminating the need for an external clock source while maintaining ±0.5% full-scale power measurement accuracy across temperature.
Can the INA229AIDGST measure energy and charge independently of host software intervention?
Yes, the INA229AIDGST performs continuous background accumulation of energy and charge using its internal timer and calibrated calculations. Once configured in continuous-conversion mode, it autonomously updates the ENERGY and CHARGE registers without host polling or firmware overhead - a core capability confirmed in Section 7.3.2 of the official datasheet.
What is the minimum shunt voltage resolution achievable with the INA229AIDGST?
With ADCRANGE = 1 (±40.96 mV full scale), the INA229AIDGST achieves a 78.125 nV LSB step size. This resolution, combined with ±1 µV offset voltage, enables precise detection of sub-milliamp currents using standard 100 mΩ or higher shunt resistors - verified in the Electrical Characteristics table (Section 6.5) under "ADC resolution" and "1 LSB step size" parameters.
How does the ALERT pin function, and can its behavior be customized?
ALERT is an open-drain output that asserts low on user-configurable conditions including overvoltage, overcurrent, power limit exceedance, or temperature threshold breach. Its trigger sources, polarity, and latching behavior are fully programmable via the MASK_ENABLE and LIMIT registers - allowing tailored fault response without external logic, as detailed in Sections 7.4 and 7.6 of the INA229AIDGST datasheet.
INA229AIDGST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±0.01%
- Voltage - Input:
- 2.7V ~ 5.5V
- Current - Output:
- 10mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
INA229AIDGST FAQ
1.How can I place an order for INA229AIDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for INA229AIDGST 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 INA229AIDGST reliable?
The price and inventory of INA229AIDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA229AIDGST is usually 5 days.
3.What payment methods are accepted for INA229AIDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA229AIDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA229AIDGST?
INA229AIDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA229AIDGST 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 INA229AIDGST?
For technical support, including INA229AIDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA229AIDGST requirements.
6.How does Aetrix verify that INA229AIDGST is sourced from the original manufacturer or authorized distributors?
All INA229AIDGST 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 INA229AIDGST meets industry standards.
7.What is the process for return or replacement of INA229AIDGST?
All INA229AIDGST units undergo pre-shipment inspection (PSI). If there is an issue with INA229AIDGST, 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 INA229AIDGST part is unused and in its original packaging.
Return procedure for INA229AIDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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