Texas Instruments INA220AIDGST

Overview

INA220AIDGST from Texas Instruments is a high- or low-side bidirectional current and power monitor IC with I²C/SMBus interface, 12-bit ADC resolution, ±40 mV shunt voltage full-scale range (PGA = /1), 0 V to 26 V bus voltage sensing capability, and operates from 3.3 V to 5.5 V supply. It delivers direct current (A), voltage (V), and power (W) readouts in server power management systems.

For engineers reviewing the INA220AIDGST datasheet, INA220AIDGST pinout, INA220AIDGST application, or INA220AIDGST equivalent, key selection considerations include its dual-range bus voltage measurement (16 V/32 V), programmable 16 I²C addresses, ±0.5% current measurement error over temperature, and VSSOP-10 package compatibility with high-density PCB layouts.

Technical Context

The INA220AIDGST integrates a delta-sigma ADC with independent shunt and bus voltage conversion paths, supporting configurable averaging (1–128 samples) and resolution (9–12 bits). Its PGA offers selectable gain (/1, /2, /4, /8) to scale shunt input range up to ±320 mV while maintaining 10 µV LSB step size.

It implements a dedicated calibration register enabling direct amperes output via internal multiplier logic, and a separate power register computing watts as 20 × Current_LSB × (Shunt Register × Calibration Register / 4096) × (Bus Register >> 3) / 5000 - all executed in hardware without host CPU intervention.

Key Specifications

Pinout & Package

VSSOP-10 package (3.00 mm × 3.00 mm), thermally enhanced for operation up to +125°C junction temperature; exposed 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 INA219AIDR, INA220AIDGST trades minor DC accuracy for shunt range configurability and hot-swap readiness; versus INA226AIDGST, it reduces resolution and temperature range to lower BOM cost while retaining identical pinout, register map, and firmware compatibility.

Availability

INA220AIDGST is available at Aetrix Electronics and suitable for server power management, telecom PSU telemetry, and notebook battery monitoring requiring stable component supply across multi-year production cycles.

Supply support for INA220AIDGST 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 current sensing and power management ICs.

The INA220 product line targets high-accuracy, digitally interfaced power monitoring in space-constrained, thermally demanding applications such as data center infrastructure and communications equipment.

FAQ

What is the maximum bus voltage the INA220AIDGST can measure?

The INA220AIDGST supports bus voltage measurement from 0 V to 26 V. This is achieved through two programmable full-scale ranges: 16 V (BRNG = 0) and 32 V (BRNG = 1), with the latter limited by absolute maximum ratings. The VBUS pin has 320 kΩ input impedance and is rated for –0.3 V to 26 V, making INA220AIDGST suitable for monitoring 12-V server rails, 24-V industrial supplies, and 48-V telecom distribution - all without external level-shifting circuitry.

Does the INA220AIDGST support bidirectional current sensing?

Yes, the INA220AIDGST supports true bidirectional current sensing. Its differential inputs (IN+ and IN–) accept a ±26 V differential voltage range, and the 12-bit shunt voltage register outputs signed values. When configured with appropriate shunt placement and calibration, INA220AIDGST reports positive current for forward flow (e.g., battery discharge) and negative current for reverse flow (e.g., battery charging), enabling accurate coulomb counting in portable and UPS applications.

How does the PGA setting affect the INA220AIDGST's shunt voltage range?

The INA220AIDGST's programmable gain amplifier (PGA) scales the shunt input range in four steps: /1 (±40 mV), /2 (±80 mV), /4 (±160 mV), and /8 (±320 mV). This allows matching the device to diverse shunt resistor values and expected load currents. For example, a /2 setting enables compatibility with TI TPS2490 hot-swap controllers that use 50-mV shunts, while /8 supports low-value shunts in high-current industrial motor drives - all while preserving the 10 µV LSB resolution.

What is the purpose of the Calibration Register in the INA220AIDGST?

The Calibration Register in the INA220AIDGST is a 16-bit read/write register used to configure the device's current-to-amperes conversion factor. When loaded with a value calculated from shunt resistance and desired current LSB, it enables the INA220AIDGST to output direct current readings in amperes via the Current Register (04h). This eliminates host MCU computation, reduces firmware complexity, and ensures consistent scaling across multiple devices in a BOM - a key advantage over raw ADC-based current monitors.

Can the INA220AIDGST operate with a 3.3-V supply while monitoring a 24-V bus?

Yes, the INA220AIDGST is explicitly designed for this scenario. Its VS pin accepts 3.3 V to 5.5 V, independent of the 0–26 V bus voltage applied to VBUS and shunt inputs. The device features galvanic isolation between supply and signal domains - no power supply sequencing is required, and the 24-V bus may be present while VS is off, or vice versa. This architecture makes INA220AIDGST ideal for monitoring higher-voltage rails using standard 3.3-V microcontrollers and I²C peripherals.