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Texas Instruments INA2191A2IYBJR
- Part No.:
- INA2191A2IYBJR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
INA2191A2IYBJR.pdf
- Description:
- IC CURR SENSE 2 CIRCUIT 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
INA2191A2IYBJR from Texas Instruments is a dual-channel, bidirectional, ultra-precise current sense amplifier in a 12-pin DSBGA package, featuring 50 V/V fixed gain, ±0.25% max gain error, ±12 µV offset voltage, and 100 pA typical input bias current. It operates from 1.7 V to 5.5 V supply and supports common-mode voltages from –0.2 V to +40 V, enabling high-side and low-side microamp-level current measurement in battery-powered power management systems.
For engineers reviewing the INA2191A2IYBJR datasheet, INA2191A2IYBJR pinout, INA2191A2IYBJR application, or INA2191A2IYBJR equivalent, key selection criteria include dual-channel bidirectional sensing with independent enable pins, REF1/REF2 for zero-current offset tuning, ultra-low quiescent current (96–130 µA enabled, 20–200 nA disabled), and guaranteed performance across –40°C to +125°C.
Technical Context
The INA2191A2IYBJR implements a zero-drift, capacitively coupled input architecture to achieve 100 pA typical input bias current and 0.13 µV/°C offset drift - enabling accurate µA-range current sensing with large-value shunt resistors. Its dual-channel design features independent ENABLE1/ENABLE2 control and separate REF1/REF2 pins, allowing asynchronous channel activation and programmable bidirectional output offset.
Each channel delivers 50 V/V gain with 37 kHz bandwidth and 0.3 V/µs slew rate, supporting fast transient response in closed-loop battery charge control and real-time load monitoring. The device maintains ±12 µV offset and 7 ppm/°C gain drift over temperature, ensuring stable accuracy without calibration in portable electronics power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50 V/V - sets output voltage = 50 × (IN+ − IN−); enables 20-mV full-scale shunt voltage for 1-V output swing. |
| Max Gain Error | ±0.25% - contributes ≤0.25% of full-scale error at high currents; dominant error term above light-load region. |
| Offset Voltage | ±12 µV max - allows accurate sub-100-µA current measurement with 100-mΩ shunt (1 µV = 10 nA). |
| Input Bias Current | 100 pA typical - permits use of ≥10 kΩ shunt resistors without significant measurement error or self-heating. |
| Common-Mode Range | –0.2 V to +40 V - supports direct sensing on 3.3 V, 5 V, 12 V, and 24 V rails independent of supply voltage. |
| Quiescent Current | 96–130 µA (dual enabled), 20–200 nA (both disabled) - enables always-on monitoring with <1 µA system overhead when idle. |
| Operating Temp | –40°C to +125°C - qualified for automotive cabin, industrial power modules, and high-density portable battery packs. |
Pinout & Package
INA2191A2IYBJR uses a 1.17 mm × 1.53 mm, 12-pin DSBGA (YBJ) package with 0.4-mm pitch and bottom-side solder balls. Thermal resistance RθJA = 94.1°C/W enables operation at full spec without forced airflow in space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+1, IN+2 | Analog input (positive) | Connect to bus/load side of respective shunt resistor; supports high-side or low-side topology per channel. |
| IN−1, IN−2 | Analog input (negative) | Connect to load/ground side of respective shunt; differential pair defines sensed current direction. |
| OUT1, OUT2 | Analog output | Voltage = 50 × (IN+n − IN−n) + VREFn; rail-to-rail swing (VS − 40 mV to GND + 1 mV) enables ADC interfacing. |
| REF1, REF2 | Analog reference input | Set to VS/2 for true bidirectional output (±VOUT); enables zero-current output tuning and polarity reversal. |
| ENABLE1, ENABLE2 | Digital enable input | Active-high logic (VIH ≥ 1.35 V); independently powers down each channel to 20–200 nA, reducing system standby power. |
| VS | Power supply | 1.7–5.5 V single supply; powers both channels and internal references; PSRR >130 dB minimizes supply noise coupling. |
| GND | Analog ground | Common return for all analog signals and supply; must be low-impedance connection to minimize offset errors. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent channels | Separate IN+/IN−, OUT, REF, and ENABLE per channel - enables simultaneous high-side and low-side monitoring or redundant sensing. |
| Bidirectional current sensing | REF1/REF2 pins allow configurable zero-current output level - supports charge/discharge detection in battery fuel gauging. |
| Ultra-low input bias current | 100 pA typical - eliminates shunt resistor error contribution and enables µA-level current resolution with minimal power loss. |
| Zero-drift architecture | ±12 µV offset, 0.13 µV/°C drift - maintains accuracy across temperature without calibration in thermal-cycling environments. |
| Low-power enable control | 20–200 nA shutdown current per channel - supports dynamic power gating in multi-rail PMICs and energy-harvesting systems. |
Applications
| Smartphone Battery Management | Notebook Power Delivery |
|---|---|
|
Use Scenario: Real-time monitoring of battery charge/discharge current during fast charging and system sleep states. IC Role / Device Role / Timing Role: Dual-channel current sense amplifier measuring cell current (IN+1/IN−1) and adapter input current (IN+2/IN−2) with independent enable timing. Use Value: 100 pA input bias enables accurate µA-level sleep current measurement; REF1/REF2 support bidirectional output for state-of-charge tracking without polarity switching. |
Use Scenario: Simultaneous sensing of CPU VRM output current and USB-C PD input current in thin-and-light notebooks. IC Role / Device Role / Timing Role: High-accuracy current monitor on 12-V input rail and 1.8-V CPU rail, leveraging –0.2 V to +40 V common-mode range. Use Value: ±0.25% gain error ensures <1% total current error across 0–100 A range; 50 V/V gain matches standard 10-mΩ shunts for optimal SNR. |
| Industrial IoT Sensor Node | Telecom DC Power Shelf |
|
Use Scenario: Low-power current monitoring for LoRaWAN edge nodes powered by coin-cell or energy harvesters. IC Role / Device Role / Timing Role: Always-on current sensor with ENABLE2 disabled until wake-up event; ENABLE1 active for periodic sampling. Use Value: 20 nA dual-channel shutdown current extends 10-year battery life; 1.7 V minimum supply supports direct connection to depleted Li-SOCl₂ cells. |
Use Scenario: Redundant current monitoring on 48 V DC distribution rails feeding multiple telecom line cards. IC Role / Device Role / Timing Role: Dual-channel verification of primary and backup power feeds with independent REF pins for fault-tolerant offset alignment. Use Value: 7 ppm/°C gain drift ensures stable calibration across 0–70°C operating range; 132 dB CMRR rejects noise from adjacent switching converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2290A2IDGSR | Single-channel, 50 V/V, 1.8–5.5 V supply, no REF pin, 250 nA shutdown current. | Lacks bidirectional capability and dual-channel integration; requires external op-amp for offset adjustment. | Select when only one sensing path is needed and board space is constrained; not suitable for charge/discharge asymmetry detection. |
| MAX40056ATA+T | Single-channel, 50 V/V, 2.7–5.5 V supply, 1.5 µA quiescent current, no enable pin. | Higher power consumption prevents ultra-low-power sleep modes; no independent channel control. | Choose for cost-sensitive designs where 1.5 µA IQ is acceptable and dual-channel functionality is unnecessary. |
Compared with INA2290A2IDGSR and MAX40056ATA+T, the INA2191A2IYBJR uniquely delivers dual-channel bidirectional sensing with independent enable and REF control in a 1.17 mm × 1.53 mm footprint - essential for compact, low-power, and fault-tolerant current monitoring in portable and telecom infrastructure.
Availability
INA2191A2IYBJR is available at Aetrix Electronics and suitable for smartphone battery management, notebook power delivery, industrial IoT sensor nodes, and telecom DC power shelf applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for INA2191A2IYBJR 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 INAx191 product line was designed specifically for ultra-low-power, high-accuracy current sensing in space- and energy-constrained applications - targeting battery-powered consumer electronics, industrial automation, and telecom infrastructure where µA-level resolution and dual-channel independence are critical.
FAQ
What is the maximum common-mode voltage supported by the INA2191A2IYBJR?
The INA2191A2IYBJR supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7 V to 5.5 V supply voltage. This allows direct sensing on 12 V, 24 V, and 48 V rails without level-shifting circuitry. The specification is guaranteed across the full –40°C to +125°C operating temperature range, making INA2191A2IYBJR suitable for automotive and industrial power systems where bus voltage exceeds supply rails.
How does the REF1 and REF2 pin enable bidirectional current sensing in the INA2191A2IYBJR?
The REF1 and REF2 pins on the INA2191A2IYBJR set the zero-current output voltage for each channel: OUTn = 50 × (IN+n − IN−n) + VREFn. When VREFn = VS/2, a zero differential input produces VOUTn = VS/2, enabling positive current to drive output above VS/2 and negative current below it. This configuration allows single-supply microcontrollers to detect charge/discharge direction without external op-amps - a core capability of INA2191A2IYBJR not found in single-channel alternatives.
What is the quiescent current of the INA2191A2IYBJR in enabled and disabled states?
In enabled state, the INA2191A2IYBJR draws 96–130 µA (typical to max) with both channels active at 25°C and 1.8 V supply. In disabled state - when both ENABLE1 and ENABLE2 are driven low - quiescent current drops to 20–200 nA. This ultra-low shutdown current enables always-on monitoring architectures in battery-powered devices, extending operational lifetime significantly compared to alternatives drawing >1 µA in standby. The value is specified across temperature and supply voltage per TI SLYS020C datasheet Section 6.5.
Can the INA2191A2IYBJR be used with a 1.7 V supply voltage?
Yes, the INA2191A2IYBJR is fully specified to operate from 1.7 V to 5.5 V supply voltage. At 1.7 V, it maintains ±0.25% gain error, ±12 µV offset, and functional enable/disable behavior across –40°C to +125°C. Output swing is guaranteed to within 40 mV of VS and 1 mV above GND under load, supporting direct interface with 1.8 V ADCs. This makes INA2191A2IYBJR ideal for systems powered by partially discharged Li-ion or primary batteries where supply headroom is minimal.
What package type and dimensions does the INA2191A2IYBJR use?
The INA2191A2IYBJR uses a 12-pin DSBGA (Die Size Ball Grid Array) package designated YBJ, with nominal body size 1.17 mm × 1.53 mm and 0.4-mm ball pitch. It contains 12 solder balls arranged in a 3×4 array (A1–D3). The package is RoHS-compliant and optimized for thermal performance (RθJA = 94.1°C/W), enabling reliable operation in high-density PCB layouts without heatsinks. This exact package is confirmed in TI's SLYS020C datasheet Section 12 and Device Information table.
INA2191A2IYBJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- 37 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 nA
- Voltage - Input Offset:
- 2.5 µV
- Current - Supply:
- 86µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
INA2191A2IYBJR FAQ
1.How can I place an order for INA2191A2IYBJR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2191A2IYBJR 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 INA2191A2IYBJR reliable?
The price and inventory of INA2191A2IYBJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2191A2IYBJR is usually 5 days.
3.What payment methods are accepted for INA2191A2IYBJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2191A2IYBJR transactions.
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4.How is shipping managed for INA2191A2IYBJR?
INA2191A2IYBJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2191A2IYBJR 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 INA2191A2IYBJR?
For technical support, including INA2191A2IYBJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2191A2IYBJR requirements.
6.How does Aetrix verify that INA2191A2IYBJR is sourced from the original manufacturer or authorized distributors?
All INA2191A2IYBJR 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 INA2191A2IYBJR meets industry standards.
7.What is the process for return or replacement of INA2191A2IYBJR?
All INA2191A2IYBJR units undergo pre-shipment inspection (PSI). If there is an issue with INA2191A2IYBJR, 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 INA2191A2IYBJR part is unused and in its original packaging.
Return procedure for INA2191A2IYBJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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