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Texas Instruments INA209AIPWR
- Part No.:
- INA209AIPWR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA209AIPWR.pdf
- Description:
- IC CURRENT MONITOR 1% 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,216
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Product details
Overview
INA209AIPWR 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 (0–32 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 INA209AIPWR datasheet, INA209AIPWR pinout, INA209AIPWR application, or INA209AIPWR equivalent, this page delivers verified technical context, calibrated accuracy specs (±0.5% current error, ±1% over temp), watchdog timing behavior (5 µs critical comparator delay), and TSSOP-16 package integration guidance - all grounded in TI SBOS403B Rev. MARCH 2009.
Technical Context
The INA209AIPWR integrates a programmable-gain amplifier (PGA ÷1/÷2/÷4/÷8) for shunt sensing and dual-channel 12-bit successive-approximation ADCs for simultaneous shunt and bus voltage conversion. Its internal multiplier register computes power (W) directly from calibrated current and voltage readings.
It implements three independent watchdog paths: warning (programmable delay), over-limit (no delay), and fast analog critical (5 µs response, 1 mV LSB DAC control). All outputs are open-drain, active-low, and transparent (non-latched), with configurable polarity and enable via SMBus registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Shunt Voltage Range | ±40 mV to ±320 mV full-scale (selectable via PGA setting; enables direct amperes readout with calibration) |
| Bus Voltage Range | 0 V to 32 V (BRNG=1 mode; supports sensing on 26 V buses with 16 V headroom) |
| Current Measurement Error | ±0.5% typical, ±1% max over –25°C to +85°C (enables accurate load monitoring without external calibration) |
| Critical DAC Resolution | 8-bit (1 mV LSB step size; sets precise analog trip thresholds for immediate shutdown) |
| ADC Conversion Time | 532–586 µs (12-bit mode; determines minimum sampling interval for real-time power tracking) |
| Supply Voltage Range | +3.0 V to +5.5 V (single supply; compatible with standard logic rails and isolated DC-DC outputs) |
| Operating Temperature | –40°C to +125°C (supports industrial and automotive under-hood deployment) |
Pinout & Package
TSSOP-16 package (PW designation), 5.0 mm × 4.4 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Positive shunt input | Connects to high-side of current sense resistor; supports common-mode up to +26 V |
| VIN− | Negative shunt / bus reference | Connects to low-side of shunt; also serves as bus voltage reference to GND (0–26 V range) |
| Convert | Conversion trigger input | Active-low pulse initiates single ADC conversion; minimum 4 µs low pulse width required |
| GND (Pins 4 & 11) | Analog/digital ground | Must be tied together at single point; separates measurement reference from digital noise |
| VS+ (Pins 5 & 10) | Power supply input | 3.0–5.5 V supply; powers analog core and digital interface; max 1.5 mA quiescent current |
| GPIO | Programmable I/O | Totem-pole output or input; default = high-impedance input; configurable via register |
| Critical | Fast analog watchdog output | Open-drain, active-low; asserts within 5 µs of critical DAC threshold breach; no latch |
| Overlimit | Upper limit watchdog output | Open-drain, active-low; immediate response (no delay); used for system shutdown signaling |
| Warning | Lower limit watchdog output | Open-drain, active-low; user-programmable delay (via Critical DAC– Register) before assertion |
| SCL/SDA | I²C/SMBus interface | Open-drain, 3.3 V tolerant; supports 400 kHz Fast Mode and 3.4 MHz High-Speed Mode |
| A0/A1 | Slave address inputs | Set 7-bit I²C address (16 options); sampled at start of each bus transaction |
| SMBus Alert | SMBus alert output | Open-drain; asserted when any enabled status flag is set; maskable per register |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent watchdogs | Enables layered protection: warning (delayed), over-limit (immediate), critical (sub-µs analog response) |
| Integrated power calculation | On-chip multiplier register computes watts directly-eliminates host MCU math overhead and rounding error |
| Peak-hold registers | Stores real-time max/min values for shunt voltage, bus voltage, and power-no firmware polling required |
| Programmable gain amplifier | Four PGA settings (÷1 to ÷8) allow one device to support multiple shunt resistors (e.g., 0.5 mΩ to 10 mΩ) |
| SMBus timeout protection | 28 ms auto-reset prevents bus lockup-critical for unattended telecom and server applications |
Applications
| Server Power Rail Monitoring | Telecom Hot-Swap Control |
|---|---|
|
Use Scenario: Real-time current, voltage, and power telemetry on 12 V and 48 V backplane rails in blade servers. IC Role / Device Role / Timing Role: High-side monitor measuring shunt drop and bus voltage simultaneously; triggers Critical output within 5 µs during short-circuit events. Use Value: Enables automatic rail shutdown before MOSFET SOA violation; peak-hold registers capture transient overload magnitude for diagnostics. |
Use Scenario: Current limiting and fault reporting in modular line cards with hot-swap controllers (e.g., TPS2375x). IC Role / Device Role / Timing Role: Secondary monitor co-located with hot-swap FET; provides independent over-current verification and programmable warning delay before controller intervention. Use Value: Reduces false trips by decoupling warning (delayed) and shutdown (instant) decisions; I²C telemetry feeds system management controller (SMC). |
| Automotive Battery Management | Industrial Power Supply Telemetry |
|
Use Scenario: Bidirectional current sensing in 12 V/24 V battery charge/discharge paths for EV auxiliary systems. IC Role / Device Role / Timing Role: Measures charging current (positive VIN+–VIN−) and regenerative braking current (negative differential); reports via SMBus to MCU. Use Value: ±1% current accuracy over –40°C to +125°C ensures reliable state-of-charge estimation; Critical output drives hardware fuse control. |
Use Scenario: Output power validation and over-load protection in programmable bench power supplies. IC Role / Device Role / Timing Role: Monitors shunt and output bus in real time; stores peak power value for compliance logging; alerts on over-voltage via Warning comparator. Use Value: Eliminates need for separate DMM or scope capture; 12-bit resolution captures ripple-induced power variations at 1.8 kHz sample rate. |
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 analog comparator; uses same TSSOP-10 package (smaller footprint but fewer features) | Lacks fast analog shutdown path; relies on host MCU for critical response - unsuitable where <10 µs reaction is required | Choose for precision telemetry-only roles where software-based fault handling is acceptable and board space is constrained. |
| INA219AIDR | 12-bit ADC, single watchdog (over-limit only), no peak-hold registers; operates down to 2.7 V supply | No warning delay or critical comparator; limited to basic current/voltage reporting - no layered protection | Choose for cost-sensitive, non-safety-critical applications like consumer USB PD adapters where only one fault level is needed. |
Compared with INA209AIPWR, INA226AIDGST offers superior measurement resolution but removes deterministic hardware-level shutdown capability, while INA219AIDR reduces feature count and watchdog flexibility to lower cost and supply voltage - neither replicates the triple-watchdog architecture or peak-hold telemetry of the INA209AIPWR.
Availability
INA209AIPWR is available at Aetrix Electronics and suitable for server power rail monitoring, telecom hot-swap control, and automotive battery management requiring stable component supply across extended temperature and long product lifecycles.
Supply support for INA209AIPWR 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 ICs, with decades of expertise in precision current sensing and industrial interface solutions.
The INA209AIPWR belongs to TI's high-accuracy current/power monitor product line, designed specifically for real-time, multi-level fault protection and telemetry in mission-critical power systems - not general-purpose amplifiers or discrete monitors.
FAQ
What is the maximum bus voltage the INA209AIPWR can safely measure?
The INA209AIPWR supports a bus voltage range of 0 V to 32 V (BRNG = 1 mode), but its absolute maximum rating limits VIN+ and VIN− common-mode voltage to +26 V. Therefore, the safe operational bus voltage is 0 V to +26 V - exceeding this risks permanent damage. The device senses from VIN− to GND, so VIN− must remain ≥ –0.3 V and ≤ +26 V per datasheet Section "Absolute Maximum Ratings".
Does the INA209AIPWR support bidirectional current measurement?
Yes, the INA209AIPWR supports true bidirectional current measurement. Its differential shunt input (VIN+ – VIN−) accepts ±40 mV to ±320 mV full-scale ranges depending on PGA setting. A positive differential voltage indicates current flow in one direction (e.g., battery discharge), while a negative voltage indicates reverse flow (e.g., regenerative braking or charging). The Current Register reports signed 16-bit values accordingly.
How does the Critical comparator differ from the Overlimit and Warning comparators in the INA209AIPWR?
The Critical comparator in the INA209AIPWR is an analog circuit with 5 µs propagation delay, directly driven by the Critical DAC outputs - enabling hardware-level, sub-microsecond response to overloads. In contrast, Overlimit and Warning are digital comparators derived from ADC results, with latency dominated by conversion time (≥532 µs). Critical is transparent and unlatched; Overlimit and Warning share the same latch-free behavior but lack analog speed.
Can the INA209AIPWR operate from a 2.8 V supply?
No, the INA209AIPWR requires a minimum supply voltage of +3.0 V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3.0 V is not specified, and power-on reset activates only above 2.0 V - but functional operation (ADC, I²C, comparators) is guaranteed only within +3.0 V to +5.5 V. Using 2.8 V may result in undefined behavior or failure to initialize.
What package type and pin count does the INA209AIPWR use?
The INA209AIPWR uses a TSSOP-16 package (TI package designator PW), with 16 leads, 0.65 mm pitch, and a 5.0 mm × 4.4 mm body. Pin 1 is located at the top-left corner (marking dot adjacent), and the package includes an exposed thermal pad that is not electrically connected - it may be left floating or grounded for thermal improvement per PCB layout guidelines in SBOS403B.
INA209AIPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
INA209AIPWR FAQ
1.How can I place an order for INA209AIPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA209AIPWR 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 INA209AIPWR reliable?
The price and inventory of INA209AIPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA209AIPWR is usually 5 days.
3.What payment methods are accepted for INA209AIPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA209AIPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA209AIPWR?
INA209AIPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA209AIPWR 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 INA209AIPWR?
For technical support, including INA209AIPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA209AIPWR requirements.
6.How does Aetrix verify that INA209AIPWR is sourced from the original manufacturer or authorized distributors?
All INA209AIPWR 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 INA209AIPWR meets industry standards.
7.What is the process for return or replacement of INA209AIPWR?
All INA209AIPWR units undergo pre-shipment inspection (PSI). If there is an issue with INA209AIPWR, 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 INA209AIPWR part is unused and in its original packaging.
Return procedure for INA209AIPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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