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Texas Instruments INA234BIYBJR
- Part No.:
- INA234BIYBJR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-XFBGA, DSBGA
- Datasheet:
-
INA234BIYBJR.pdf
- Description:
- 28-V, 12-BIT, IC OUTPUT CURRENT/
- Quantity:
- Payment:
- Shipping:
Inventory:701
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Product details
Overview
INA234BIYBJR from Texas Instruments is a 12-bit digital current, voltage, and power monitor IC with I²C/SMBus interface, designed for high-side or low-side shunt-based sensing in systems with bus voltages from –0.3 V to 28 V. It delivers ±0.5% gain error, 100 µV max shunt offset, 1.7–5.5 V supply operation, and operates across –40°C to +125°C - enabling precision power monitoring in battery-powered portable electronics.
For engineers reviewing the INA234BIYBJR datasheet, INA234BIYBJR pinout, INA234BIYBJR application, or INA234BIYBJR equivalent, key selection criteria include its dual-range programmable shunt full-scale (20 mV / 80 mV), 12-bit delta-sigma ADC with configurable averaging, open-drain ALERT output for over/under-current/voltage/power events, and DSBGA-8 package compatibility with space-constrained PCB layouts.
Technical Context
The INA234BIYBJR integrates a multiplexed 12-bit delta-sigma ADC that alternately samples shunt voltage (IN+ to IN–) and bus voltage (IN– to GND), supporting independent conversion-time programming (140 µs to 8.24 ms) and up to 1024-sample averaging. Its input bias current remains ≤10 nA during current measurement mode, enabling accurate sub-mA sensing with high-value shunt resistors.
It features a programmable calibration register that scales raw ADC outputs to direct current (amperes) and power (watts) readings, while maintaining high common-mode rejection (100–120 dB CMRR) across –0.3 V to 28 V. The ALERT pin supports five selectable alert functions - SOL, SUL, BOL, BUL, POL - with latchable or transparent behavior controlled via the Mask/Enable register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 12-bit delta-sigma; provides 40 µV LSB (ADCRANGE=1) for fine-grained current resolution at light loads. |
| Shunt Gain Error | ±0.5% max; ensures <±1 mA absolute error on 200 mA full-scale measurements using 100 mΩ shunt. |
| Common-Mode Range | –0.3 V to 28 V; enables monitoring of 24 V industrial rails or negative-bias circuits without level-shifting. |
| Supply Voltage Range | 1.7 V to 5.5 V; supports direct connection to 1.8 V, 3.3 V, or 5 V logic domains without external regulators. |
| I²C Interface | 1.2 V–5.5 V tolerant; compatible with ultra-low-voltage microcontrollers and legacy SMBus hosts without pull-up translation. |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive modules, industrial power supplies, and ruggedized wearables. |
| Quiescent Current | 300 µA typical (active), 2.2 µA typical (shutdown); extends battery life in always-on monitoring applications. |
Pinout & Package
INA234BIYBJR is housed in an 8-bump DSBGA package (YBJ), measuring 0.745 mm × 1.508 mm with 0.4 mm pitch, optimized for ultra-compact portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Address select input | Configures I²C address to either 0x40 or 0x41 by connecting to GND, SCL, SDA, or VS - enables dual-device stacking on same bus. |
| ALERT | Open-drain alert output | Asserts on user-defined over/under conditions (SOL/SUL/BOL/BUL/POL) or conversion-ready signal; requires external pull-up. |
| GND | Analog/digital ground | Single reference node for both analog sensing and digital interface; must be low-impedance and star-connected near shunt. |
| IN– | Current sense reference / bus voltage input | Serves as differential reference for shunt measurement and single-ended input for bus voltage sensing (–0.3 V to 28 V range). |
| IN+ | Current sense positive input | Connects to high-side of shunt (for high-side sensing) or load side (for low-side sensing); 140 kΩ differential input impedance. |
| SDA | I²C bidirectional data line | Open-drain interface compliant with 1.2 V–5.5 V logic; supports Fast Mode (400 kHz) and High-Speed Mode (up to 2.94 MHz). |
| SCL | I²C clock input | Open-drain clock input; timing-critical path requiring controlled trace length and minimal capacitance for reliable high-speed operation. |
| VS | Power supply input | Accepts 1.7–5.5 V; powers internal analog and digital blocks; bypass capacitor (0.1 µF) required adjacent to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable shunt full-scale range | 20 mV or 80 mV selection allows optimization between resolution (e.g., 10 µV LSB) and dynamic range for varying current magnitudes. |
| Configurable averaging & conversion time | 8 conversion-time options (140 µs–8.24 ms) paired with 1×–1024× averaging enable trade-off between update rate, noise rejection, and power consumption. |
| Direct current/power readout | Internal multiplier applies user-loaded calibration value to convert raw ADC codes into amperes and watts - eliminates host-side math overhead. |
| Low input bias current (≤10 nA) | Enables use of high-value shunt resistors (>1 Ω) for accurate sub-mA current measurement without significant measurement error. |
| General call synchronization | Allows simultaneous conversion start across multiple INA234BIYBJR devices on same I²C bus - critical for phase-aligned power profiling in multi-rail systems. |
| Alert limit flexibility | Five independent alert types (SOL/SUL/BOL/BUL/POL) with dedicated limit registers support autonomous fault detection without host polling. |
Applications
| Mobile Power Management | Wearable Battery Monitoring |
|---|---|
Use Scenario: Real-time current draw tracking during RF transmission bursts in LTE/5G smartphones to optimize thermal throttling and battery lifetime. IC Role / Device Role / Timing Role: High-side current monitor reporting millisecond-resolution current and power values via I²C to application processor. Use Value: Enables dynamic power budgeting using actual rail current instead of modeled estimates, improving battery estimation accuracy by >8%. |
Use Scenario: Continuous sub-100 µA current monitoring in hearables during Bluetooth LE advertising and sensor sampling cycles. IC Role / Device Role / Timing Role: Low-bias current sensor operating in triggered mode with 1024-sample averaging to resolve 50 nA changes in charging current. Use Value: Detects micro-leakage faults in Li-ion cells early, extending wearable service life by preventing premature capacity degradation. |
| USB-C PD Power Delivery | Rack Server VRM Telemetry |
Use Scenario: Bidirectional current and power measurement on 20 V USB-C PD input rails to enforce safety limits and log energy consumption. IC Role / Device Role / Timing Role: Dual-range monitor configured for 80 mV FS during negotiation and 20 mV FS during steady-state delivery, with ALERT-driven overcurrent shutdown. Use Value: Meets USB-IF PD3.1 compliance requirements for ±1% power reporting accuracy across 0–5 A load range. |
Use Scenario: Per-phase current and power telemetry in 48 V intermediate bus architecture (IBA) server power supplies with PMBus-compatible control. IC Role / Device Role / Timing Role: High-temperature-rated sensor (–40°C to +125°C) placed adjacent to MOSFETs, reporting real-time losses to BMC via I²C. Use Value: Enables predictive thermal derating before VRM overheating occurs, reducing unplanned downtime by 32% in hyperscale deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current/voltage/power monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIRSAT | 16-bit resolution, fixed 80 mV shunt FS, no programmable averaging, higher quiescent current (600 µA) | Better resolution for static power analysis; less suitable for fast transient capture or ultra-low-power wake-on-current events | Select when absolute current accuracy >0.1% is required and update rate <100 Hz suffices. |
| MAX40080AUB+ | 3-channel independent sensing, 12-bit, 1.71–5.5 V supply, but only supports high-side sensing and lacks bus voltage measurement | Optimized for multi-rail SoC power sequencing; cannot replace INA234BIYBJR in bus voltage + power calculation use cases | Choose only for discrete rail current monitoring where bus voltage telemetry is handled separately. |
Compared with INA226AIRSAT and MAX40080AUB+, the INA234BIYBJR uniquely combines programmable shunt range, integrated bus voltage sensing, power calculation, and ultra-low bias current - making it the only option among the three capable of autonomous sub-mA battery monitoring with direct watt reporting in a single DSBGA-8 device.
Availability
INA234BIYBJR is available at Aetrix Electronics and suitable for mobile phones, wearables, and USB-C power delivery systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA234BIYBJR 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 sensing and power management ICs.
The INA234 product line targets compact, battery-sensitive applications demanding high-accuracy, low-power, and small-footprint current/voltage/power telemetry - especially where space, thermal constraints, and firmware overhead must be minimized.
FAQ
What is the maximum common-mode voltage the INA234BIYBJR can measure?
The INA234BIYBJR supports a common-mode input range of –0.3 V to 28 V on the IN+ and IN– pins, independent of its 1.7–5.5 V supply voltage. This allows it to monitor 24 V industrial buses or negative-biased circuits without external level-shifting circuitry. The specification is validated across the full –40°C to +125°C temperature range and is not degraded by supply voltage variation.
Does the INA234BIYBJR support both high-side and low-side current sensing configurations?
Yes, the INA234BIYBJR explicitly supports both high-side and low-side shunt configurations. For high-side sensing, IN+ connects to the bus voltage and IN– connects to the load side of the shunt; for low-side, IN+ connects to the load and IN– connects to system ground. Its high input impedance in current-measurement mode (≥140 kΩ differential) prevents loading errors in either topology.
How does the ALERT pin function on the INA234BIYBJR?
The ALERT pin on the INA234BIYBJR is an open-drain output that can be configured via the Mask/Enable register to signal one of five conditions: shunt over/under-limit, bus over/under-limit, or power over-limit. It may also indicate conversion-ready status. The pin asserts when the selected condition exceeds its programmed threshold, and latching behavior is controlled by the Alert Latch bit in the same register.
Can the INA234BIYBJR report power directly in watts without host-side computation?
Yes, the INA234BIYBJR includes an internal multiplier that applies a user-programmed calibration value to raw ADC outputs, enabling direct readout of current in amperes and power in watts from dedicated registers. This eliminates the need for host MCU to perform floating-point multiplication or scaling, reducing firmware complexity and latency in real-time power management loops.
What is the smallest detectable current change with the INA234BIYBJR using a 100 mΩ shunt resistor?
With ADCRANGE = 1 (20 mV full-scale) and a 100 mΩ shunt, the INA234BIYBJR achieves a 10 µV LSB, corresponding to 100 nA current resolution. Combined with ≤100 µV offset and ±0.5% gain error, this enables reliable detection of sub-microampere current changes in battery leakage testing or ultra-low-power sleep-state monitoring.
INA234BIYBJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High/Low-Side
- Accuracy:
- ±0.5%
- Voltage - Input:
- 1.7V ~ 5.5V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DSBGA (0.71x1.47)
INA234BIYBJR FAQ
1.How can I place an order for INA234BIYBJR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA234BIYBJR 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 INA234BIYBJR reliable?
The price and inventory of INA234BIYBJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA234BIYBJR is usually 5 days.
3.What payment methods are accepted for INA234BIYBJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA234BIYBJR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA234BIYBJR?
INA234BIYBJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA234BIYBJR 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 INA234BIYBJR?
For technical support, including INA234BIYBJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA234BIYBJR requirements.
6.How does Aetrix verify that INA234BIYBJR is sourced from the original manufacturer or authorized distributors?
All INA234BIYBJR 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 INA234BIYBJR meets industry standards.
7.What is the process for return or replacement of INA234BIYBJR?
All INA234BIYBJR units undergo pre-shipment inspection (PSI). If there is an issue with INA234BIYBJR, 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 INA234BIYBJR part is unused and in its original packaging.
Return procedure for INA234BIYBJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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