Texas Instruments INA220BIDGSR

Overview

INA220BIDGSR from Texas Instruments is a high-accuracy, bidirectional current and power monitor IC with I²C/SMBus interface, designed for high- or low-side shunt sensing in 0–26 V bus systems. It delivers 12-bit ADC resolution, ±0.3% current measurement error over temperature, 4 mV LSB bus voltage quantization, and operates from 3.3 V to 5.5 V supply. It is used in server power rails and telecom DC/DC converters for real-time power telemetry.

For engineers reviewing the INA220BIDGSR datasheet, INA220BIDGSR pinout, INA220BIDGSR application, or INA220BIDGSR equivalent, key selection criteria include its ±0.3% current accuracy over –40°C to +85°C, programmable PGA (×1/2/4/8), 16 I²C addresses, VSSOP-10 package compatibility, and support for both high-side and low-side shunt configurations in industrial power management systems.

Technical Context

The INA220BIDGSR integrates a delta-sigma ADC with independent averaging control for shunt voltage (up to 128 samples) and bus voltage (up to 128 samples), enabling noise-reduced measurements in noisy power environments. Its internal multiplier and calibration register allow direct current (amperes) and power (watts) readouts without host-side computation.

It supports triggered and continuous conversion modes via configuration register MODE bits, includes a dedicated Conversion Ready flag for synchronization, and features power-down mode with 40 µs wake-up latency and 6–15 µA quiescent current. The device tolerates up to 26 V common-mode input and –26 V to +26 V differential input across IN+/IN–.

Key Specifications

Pinout & Package

VSSOP-10 package: 3.00 mm × 3.00 mm body, 0.5 mm lead pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current and power monitoring applications.

Compared with INA219BIDR and INA226AIDGST, the INA220BIDGSR offers balanced accuracy (±0.3%), flexible PGA scaling, and proven reliability in telecom/server infrastructure - making it optimal for cost-sensitive yet performance-critical 0–26 V bus monitoring where design-in maturity matters.

Availability

INA220BIDGSR is available at Aetrix Electronics and suitable for server power rail monitoring, telecom DC/DC converter telemetry, and notebook battery charge management requiring stable component supply and long-term production continuity.

Supply support for INA220BIDGSR 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 INA220 product line was developed to deliver high-accuracy, digitally interfaced current and power monitoring for enterprise and communications infrastructure - emphasizing robustness, configurability, and seamless integration into existing I²C-based power management architectures.

FAQ

What is the maximum bus voltage the INA220BIDGSR can measure?

The INA220BIDGSR supports bus voltage measurements from 0 V to 26 V on the VBUS pin. This range covers standard intermediate bus voltages including 12 V, 24 V, and 48 V telecom rails. The device uses two programmable full-scale ranges (16 V and 32 V) selected via the BRNG bit in the Configuration Register, ensuring optimal resolution across the supported span. Exceeding 26 V may damage the device.

Does the INA220BIDGSR support high-side or low-side shunt configurations?

Yes, the INA220BIDGSR supports both high-side and low-side shunt sensing. Its separate IN+ and IN– differential inputs and independent VBUS pin allow placement of the shunt resistor on either side of the load. This flexibility enables compatibility with TI hot-swap controllers like the TPS2490 and simplifies integration into existing power architectures without requiring redesign of current-sense topology.

What is the current measurement accuracy of the INA220BIDGSR over temperature?

The INA220BIDGSR achieves ±0.3% maximum current measurement error over the operating temperature range of –40°C to +85°C. This specification applies specifically to the B-grade version (INA220B), which is the variant embodied by the INA220BIDGSR. The A-grade version has ±0.5% max error. Accuracy is maintained through internal calibration, PGA compensation, and matched front-end design - no external trimming is required.

How many I²C addresses does the INA220BIDGSR support?

The INA220BIDGSR supports 16 unique I²C slave addresses, configured using the A0 and A1 pins. Each pin can be tied to GND, VS, SCL, or SDA, yielding 4 × 4 = 16 combinations. This enables multiple INA220BIDGSR devices to share the same I²C bus without address conflict - critical for multi-rail monitoring in servers and telecom equipment where several power domains require independent telemetry.

What is the conversion time for a full 12-bit measurement on the INA220BIDGSR?

The INA220BIDGSR requires 532 µs (typical) to complete a single 12-bit ADC conversion for either shunt voltage or bus voltage. When both channels are enabled in continuous mode with default averaging, total cycle time depends on configured SADC and BADC settings. For example, with 12-bit resolution and no averaging, shunt and bus conversions occur sequentially within ~1.1 ms. The Conversion Ready (CNVR) bit in the Status Register signals completion for software synchronization.