Texas Instruments INA223AIDSKR

Overview

INA223AIDSKR from Texas Instruments is a voltage-output current shunt and bus voltage monitor with integrated analog multiplier for instantaneous power calculation. It operates across 0 V to 26 V common-mode range, supports programmable shunt gains (20/128/300 V/V) and bus attenuations (0.1/0.2/0.4 V/V), and delivers ±0.25% shunt gain error, ±0.15% bus gain error, and ≤1.25% power measurement error - enabling precision power monitoring in notebook battery rails and telecom DC-DC outputs.

For engineers reviewing the INA223AIDSKR datasheet, INA223AIDSKR pinout, INA223AIDSKR application, or INA223AIDSKR equivalent, this device requires attention to its two-wire configurable output multiplexer, shutdown-enabled quiescent current (≤1 µA), thermal pad grounding, and SON-10 package layout constraints for low-offset current sensing at sub-10 mV shunt drops.

Technical Context

The INA223AIDSKR implements a zero-drift amplifier architecture with 0.3 µV/°C max offset drift and 50–125 ppm/°C gain drift, ensuring stable current measurement over –40°C to +105°C. Its analog multiplier core computes instantaneous power by multiplying scaled shunt voltage (RTI) and scaled bus voltage (RTI), with output voltage directly proportional to power via programmable POWERGAIN values (0.667–40).

Configuration is performed via a two-wire (SMBus-compatible) interface controlling output mode (bus voltage, shunt voltage, supply power, or load power), gain selection, and enable/disable state. The device features rail-to-rail output swing (VS – 35 mV to GND + 10 mV), 10–25 kHz bandwidth depending on gain, and input bias current ≤18 µA enabled / ≤1.5 µA disabled.

Key Specifications

Pinout & Package

The INA223AIDSKR is housed in a 3 mm × 3 mm SON-10 package (DSK) with exposed thermal pad requiring solder connection to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA226AIDGSR and INA219AIDR, the INA223AIDSKR uniquely provides a configurable analog output (VOUT) that directly delivers scaled shunt voltage, bus voltage, or instantaneous power - eliminating ADC conversion latency and MCU computational load while retaining full analog signal integrity for oscilloscope-based diagnostics or analog feedback loops.

Availability

INA223AIDSKR is available at Aetrix Electronics and suitable for battery management systems, telecom power supplies, server PSUs, and industrial PLCs requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for INA223AIDSKR 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 INA223AIDSKR belongs to TI's high-accuracy current-sense amplifier product line, designed specifically for real-time analog power monitoring in space-constrained, thermally demanding applications where digital interfaces add latency or complexity.

FAQ

What is the maximum common-mode voltage the INA223AIDSKR can measure?

The INA223AIDSKR supports a common-mode input range of 0 V to 26 V, independent of its 2.7–5.5-V supply voltage. This allows direct high-side sensing on 24-V industrial rails or laptop battery inputs without external level-shifting circuitry. The specification is guaranteed over the full –40°C to +105°C operating temperature range, and the device remains functional (though potentially saturated) up to 26 V even if internal scaling exceeds supply rails.

How does the INA223AIDSKR calculate instantaneous power?

The INA223AIDSKR uses an integrated analog multiplier to compute instantaneous power as the product of its internally scaled shunt voltage (programmable gain: 20/128/300 V/V) and scaled bus voltage (programmable attenuation: 0.1/0.2/0.4 V/V). The resulting analog output voltage at VOUT equals Power × POWERGAIN × R_shunt, where POWERGAIN values (e.g., 10 for GSV=300 & GBV=0.1) are fixed per configuration and documented in the datasheet.

Can the INA223AIDSKR operate with a 2.7-V supply?

Yes, the INA223AIDSKR is fully specified to operate from 2.7 V to 5.5 V. At 2.7 V, it maintains all key performance parameters including ±0.25% shunt gain error, 0.3 µV/°C offset drift, and 10–25 kHz bandwidth. However, bus voltage attenuation must be selected so the scaled internal bus voltage (e.g., 24 V × 0.1 = 2.4 V) stays below VS to avoid saturation - making 0.1 V/V the preferred setting for high common-mode rails at low supply voltages.

What is the purpose of the dual VIN+ and VIN− pins on the INA223AIDSKR?

The INA223AIDSKR provides two VIN+ pins (9 and 10) and two VIN− pins (1 and 2) to support true Kelvin (4-wire) connections to the shunt resistor. This minimizes errors from PCB trace resistance and contact impedance, preserving the ±100 µV max offset and high CMRR. Both pins in each pair are internally shorted, so either may be used - but best practice is to route one to each shunt terminal with minimal loop area for optimal noise rejection.

Does the INA223AIDSKR require external components for basic operation?

Yes - the INA223AIDSKR requires a 0.1-µF ceramic bypass capacitor between VS and GND, placed as close as possible to the pins. A 4.7-kΩ pull-up resistor on SCL is also required for two-wire communication. No external gain-setting resistors or op-amp compensation networks are needed, as all signal conditioning is internal. The thermal pad must be soldered to a grounded copper pour for thermal and electrical stability.