Texas Instruments INA2290A5IDGKR

Overview

INA2290A5IDGKR from Texas Instruments is a dual-channel, ultra-precise current-sense amplifier optimized for high-side sensing in 48-V and 120-V power rails. It delivers ±12 µV max input offset voltage, ±0.15% max gain error (A5 variant), and 1.1-MHz bandwidth at 500 V/V gain-enabling accurate, high-speed overcurrent detection in telecom and server power supplies.

For engineers reviewing the INA2290A5IDGKR datasheet, INA2290A5IDGKR pinout, INA2290A5IDGKR application, or INA2290A5IDGKR equivalent, key selection criteria include its 500 V/V fixed gain, −20 V to +122 V survival common-mode range, 85-dB AC CMRR at 50 kHz, and dual-channel isolation for independent rail monitoring in dense PCB layouts.

Technical Context

The INA2290A5IDGKR employs a transconductance architecture with current-feedback amplifiers to achieve low 20-µA typical input bias current even at 120-V common-mode voltage. Its zero-drift topology ensures stable offset performance across −40°C to +125°C, while the internal precision resistor network fixes gain at 500 V/V without external components.

This A5-gain variant operates from 2.7 V to 20 V supply, supports output swing within 70 mV of VS and 25 mV of GND (R_L = 10 kΩ), and maintains ≥800 kHz −3-dB bandwidth under 8-mV V_SENSE conditions-critical for fast transient response in 48-V merchant PSU protection circuits.

Key Specifications

Pinout & Package

The INA2290A5IDGKR is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, with exposed thermal pad recommended for GND connection to enhance power dissipation in continuous 48-V monitoring.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA2290A5IDGKR, INA240A5IDR offers lower cost and higher AC CMRR but sacrifices 120-V operation and dual-channel density; MAX40056AUB+T delivers superior bandwidth yet requires two devices to match dual-rail monitoring, increasing BOM count and PCB area.

Availability

INA2290A5IDGKR is available at Aetrix Electronics and suitable for 48-V rack servers, macro remote radio units, and active antenna systems requiring stable component supply with guaranteed long-term manufacturability and traceable lot-level documentation.

Supply support for INA2290A5IDGKR 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 INAx290 product line was engineered specifically for ultra-precise, high-common-mode current sensing in next-generation telecom infrastructure, datacenter power supplies, and industrial energy monitoring systems.

FAQ

What is the maximum common-mode voltage the INA2290A5IDGKR can withstand continuously?

The INA2290A5IDGKR supports continuous operation from 2.7 V to 120 V common-mode input voltage. Its survival rating extends to −20 V to +122 V, enabling robustness against load-dump transients and reverse-polarity events in 48-V systems. This specification is validated across the full −40°C to +125°C temperature range and applies to both IN+1/IN+2 pins independently.

Does the INA2290A5IDGKR require external gain-setting resistors?

No, the INA2290A5IDGKR uses an internal precision resistor network to fix gain at 500 V/V. Adding external resistors is not recommended, as TI specifies that absolute resistor values vary significantly-even though ratios are tightly matched. The device achieves ±0.15% max gain error and ±5 ppm/°C drift without user adjustment, ensuring consistent performance across production lots and temperature extremes.

How does the INA2290A5IDGKR handle high-frequency noise in 48-V switch-mode power supplies?

The INA2290A5IDGKR combats high-frequency noise via 160-dB DC CMRR and 85-dB AC CMRR at 50 kHz, rejecting common-mode switching artifacts from adjacent buck converters. Its current-feedback architecture and 800-kHz bandwidth preserve signal integrity for fast overcurrent detection, while the dual-channel isolation (>140 dB at 100 kHz) prevents crosstalk between monitored rails in dense 48-V server boards.

Can the INA2290A5IDGKR be used for bidirectional current sensing?

No, the INA2290A5IDGKR is designed exclusively for unidirectional, high-side current sensing. Its input topology restricts operation to positive common-mode voltages above GND, and it does not support negative V_SENSE polarity or symmetric bipolar output swing. For bidirectional applications, TI recommends the INA2293 or INA240 series, which feature rail-to-rail output and extended V_SENSE range.

What thermal considerations apply to the INA2290A5IDGKR in a 48-V telecom power module?

In a 48-V telecom module, the INA2290A5IDGKR's 169.3°C/W junction-to-ambient thermal resistance (θ_JA) requires careful layout: the exposed thermal pad must be soldered to a minimum 100-mm² GND copper pour, and ambient temperature must stay below +85°C to maintain junction temperature ≤125°C. Quiescent current (680–900 µA/channel) limits self-heating, but simultaneous full-scale output into 10-kΩ loads adds ~1.5 mW per channel.