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Texas Instruments INA209AIPWG4
- Part No.:
- INA209AIPWG4
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA209AIPWG4.pdf
- Description:
- IC CURRENT MONITOR 1% 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,676
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Product details
Overview
INA209AIPWG4 from Texas Instruments is a high-side, bi-directional current/power monitor IC with integrated 12-bit ADC, I²C/SMBus interface, and triple watchdog comparators. It measures shunt voltage (±40 mV to ±320 mV full-scale), bus voltage (0–26 V), and calculates real-time power (watts); used in server power rails and telecom hot-swap circuits for precise overload detection and telemetry.
For engineers reviewing the INA209AIPWG4 datasheet, INA209AIPWG4 pinout, INA209AIPWG4 application, or INA209AIPWG4 equivalent, this page delivers verified technical context, calibrated accuracy specs (±1% over temp), watchdog timing behavior (5 µs critical comparator delay), and validated alternatives for current-sensing system design.
Technical Context
The INA209AIPWG4 integrates a programmable gain amplifier (PGA ÷1/÷2/÷4/÷8), dual-channel 12-bit ADC (shunt + bus), and on-chip multiplier for direct current (A) and power (W) register outputs. Its analog watchdog path includes three independent comparators - warning (user-delayed), over-limit (no-delay), and fast critical (5 µs response) - each driving open-drain outputs.
It operates from a single 3.0–5.5 V supply, supports I²C fast-mode (400 kHz) and SMBus protocols, and features configurable address pins (A0/A1) for up to 16 device addresses on one bus. The device senses common-mode voltages from –0.3 V to +26 V while maintaining 120 dB CMRR and ±100 µV RTI offset over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Shunt Voltage Range | ±40 mV to ±320 mV (selectable via PGA; enables accurate sensing across 100 µΩ–10 mΩ shunts) |
| Bus Voltage Range | 0–26 V (supports 12 V/24 V systems; BRNG bit selects 16 V or 32 V ADC scaling) |
| ADC Resolution | 12 bits (shunt/bus channels; 10 µV LSB for shunt, 4 mV LSB for bus voltage) |
| Current Accuracy | ±0.5% typical, ±1% max over –25°C to +85°C (enables reliable trip-point setting without calibration) |
| Critical Comparator Delay | 5 µs (fastest analog watchdog path; triggers immediate shutdown on overcurrent events) |
| Supply Current | 1.5 mA active, 15 µA power-down (low quiescent draw for always-on monitoring) |
| I²C Interface Speed | Up to 400 kHz (fast-mode compatible; supports real-time telemetry at ≤2 ms update intervals) |
Pinout & Package
TSSOP-16 package (4.4 mm × 5.0 mm, 0.65 mm pitch), thermally enhanced with dual VS+ and GND pins for low-impedance power/ground routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Positive shunt terminal | Connects to high-side of current-sense resistor; withstands –0.3 V to +26 V common-mode |
| VIN– | Negative shunt / bus reference | Connects to shunt low-side and serves as bus voltage reference to GND; defines 0–26 V measurement range |
| Convert | Conversion trigger input | Active-low pulse ≥4 µs initiates ADC conversion; optional in continuous mode |
| GPIO | Programmable I/O | Totem-pole output or digital input; default high-impedance input; usable for status signaling or control |
| Critical | Fast analog watchdog output | Open-drain, active-low; responds within 5 µs to DAC-set threshold violations; non-latched by default |
| Overlimit | Upper limit watchdog output | Open-drain, active-low; no user delay; used for immediate system shutdown on overvoltage/overpower |
| Warning | Lower limit watchdog output | Open-drain, active-low; user-programmable delay (via Critical DAC– register) for pre-fault alerts |
| SMBus Alert | SMBus alert interrupt | Open-drain, controlled by SMBus Alert Mask Register; signals register-based event conditions to host |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent watchdogs | Separate warning (delayed), over-limit (instant), and critical (5 µs analog) comparators enable tiered fault response |
| Integrated power calculation | On-chip multiplier computes real-time power (W) from shunt current and bus voltage registers - no external computation needed |
| Peak-hold registers | Stores peak shunt voltage, bus voltage, and power values since last reset - essential for transient overload analysis |
| Configurable I²C address | A0/A1 pins support 16 unique slave addresses (1000000b to 1001111b), enabling multi-device monitoring on single bus |
| High CMRR & low offset | 120 dB CMRR and ±100 µV RTI offset ensure stable measurements in noisy 24 V industrial or telecom environments |
Applications
| Server Power Rail Monitoring | Telecom Hot-Swap Control |
|---|---|
|
Use Scenario: Real-time current and power monitoring on 12 V/48 V backplane rails in blade servers to prevent overcurrent faults during module insertion. IC Role / Device Role / Timing Role: High-side current/power sensor with I²C telemetry and fast critical comparator for <5 µs shutdown initiation. Use Value: Enables compliance with PICMG 3.0 hot-swap timing requirements while providing digital telemetry for BMC integration. |
Use Scenario: Protection and telemetry for line cards inserted into powered telecom chassis using TI TPS237x hot-swap controllers. IC Role / Device Role / Timing Role: Secondary current monitor co-located with hot-swap FET; provides independent overcurrent validation and power reporting. Use Value: Adds redundancy to primary hot-swap controller protection and supplies telemetry for dynamic load balancing across distributed power modules. |
| Automotive ECU Power Management | Industrial 24 V DC Power Supply Monitoring |
|
Use Scenario: Monitoring battery-fed 12 V power distribution in engine control units where transient overloads must be detected before fuse blow. IC Role / Device Role / Timing Role: Bi-directional current sensor with warning comparator (programmable delay) and over-limit output for staged response to load dumps or short circuits. Use Value: Supports ISO 16750-2 load-dump immunity testing by capturing peak current/voltage transients in dedicated peak-hold registers. |
Use Scenario: Continuous monitoring of 24 V industrial PLC power supplies feeding motor drives and I/O modules subject to inrush and stall currents. IC Role / Device Role / Timing Role: High-side shunt monitor interfacing with microcontroller via I²C; delivers calibrated current, voltage, and power every 2 ms. Use Value: Eliminates need for external op-amps and ADCs; ±1% accuracy over temperature ensures reliable trip thresholds without field recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current/power monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIDGST | Higher resolution (16-bit ADC), no critical comparator; 2.7–5.5 V supply; 0–36 V bus range | Lacks 5 µs analog watchdog; better suited for precision telemetry than fast shutdown | Select when high-accuracy power logging is prioritized over sub-10 µs fault response |
| MAX4008AASA+ | Dual comparator outputs only (no ADC/I²C); ±200 mV shunt range; 2.7–5.5 V supply | No digital telemetry or power calculation; purely analog fault signaling | Select when system already includes ADC/microcontroller and only needs fast, dedicated overcurrent assertion |
Compared with INA209AIPWG4, INA226AIDGST offers superior measurement resolution but omits the critical watchdog path essential for hardware-fast shutdown, while MAX4008AASA+ provides deterministic analog response but requires external digitization and computation - making INA209AIPWG4 the only option integrating both precision telemetry and sub-10 µs hardware fault handling in one TSSOP-16 device.
Availability
INA209AIPWG4 is available at Aetrix Electronics and suitable for server power management, telecom hot-swap systems, and automotive ECU designs requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for INA209AIPWG4 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, embedded processing, and power management technologies, with decades of expertise in precision current sensing and industrial-grade signal conditioning.
The INA209AIPWG4 belongs to TI's high-side current/power monitor product line, designed specifically for systems requiring simultaneous digital telemetry and hardware-fast fault response in 0–26 V bus applications.
FAQ
What is the maximum bus voltage the INA209AIPWG4 can safely measure?
The INA209AIPWG4 supports a common-mode input range of –0.3 V to +26 V on VIN– and VIN+, with absolute maximum ratings up to +26 V differential. It must never be exposed to >26 V - exceeding this risks permanent damage. The device's internal ADC scaling (BRNG bit) supports 16 V or 32 V full-scale ranges, but physical voltage limits remain capped at 26 V per datasheet Absolute Maximum Ratings.
Does the INA209AIPWG4 support bi-directional current sensing?
Yes, the INA209AIPWG4 supports true bi-directional current sensing. Its shunt voltage input accepts ±40 mV to ±320 mV (depending on PGA setting), allowing it to detect current flow in either direction across the sense resistor. The Current Register reports signed 16-bit values, enabling distinction between charge and discharge in battery or regenerative braking applications.
How does the Critical comparator differ from the Overlimit and Warning comparators in the INA209AIPWG4?
The Critical comparator in the INA209AIPWG4 is an analog path with 5 µs propagation delay, directly tied to the Critical DAC outputs and bypassing digital registers - enabling hardware-fast response to overcurrent events. In contrast, Overlimit has no delay but is register-controlled, and Warning includes user-programmable delay via the Critical DAC– register. All three drive separate open-drain outputs and operate independently.
Can the INA209AIPWG4 operate from a 3.3 V supply while monitoring a 24 V bus?
Yes, the INA209AIPWG4 operates from a 3.0–5.5 V supply (VS+) and simultaneously monitors buses from 0 V to 26 V referenced to VIN–. Its high common-mode rejection (120 dB) and isolated input structure allow clean measurement of shunt voltage and bus voltage even with large supply-to-bus differentials - confirmed across –25°C to +85°C operation.
What is the function of the Convert pin on the INA209AIPWG4?
The Convert pin on the INA209AIPWG4 is an active-low, edge-triggered input that initiates a single ADC conversion cycle when pulsed low for ≥4 µs. In triggered mode, it provides deterministic timing control independent of I²C traffic. If unused, it must be tied high; in continuous mode, it is ignored and conversions run autonomously at ~1.7 kHz.
INA209AIPWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±1%
- Voltage - Input:
- 0V ~ 26V
- Current - Output:
- -
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
INA209AIPWG4 FAQ
1.How can I place an order for INA209AIPWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA209AIPWG4 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 INA209AIPWG4 reliable?
The price and inventory of INA209AIPWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA209AIPWG4 is usually 5 days.
3.What payment methods are accepted for INA209AIPWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA209AIPWG4 transactions.
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4.How is shipping managed for INA209AIPWG4?
INA209AIPWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA209AIPWG4 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 INA209AIPWG4?
For technical support, including INA209AIPWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA209AIPWG4 requirements.
6.How does Aetrix verify that INA209AIPWG4 is sourced from the original manufacturer or authorized distributors?
All INA209AIPWG4 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 INA209AIPWG4 meets industry standards.
7.What is the process for return or replacement of INA209AIPWG4?
All INA209AIPWG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA209AIPWG4, 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 INA209AIPWG4 part is unused and in its original packaging.
Return procedure for INA209AIPWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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