Texas Instruments INA4290A4IRGVR

Overview

INA4290A4IRGVR from Texas Instruments is a quad-channel, high-side-only current-sense amplifier with 200 V/V fixed gain, 2.7-V to 20-V supply operation, ±12 µV max input offset voltage, and 850-kHz bandwidth at 20-mV input sense voltage. It delivers ultra-precise DC and transient current measurement in 48-V server power rails and remote radio units.

For engineers reviewing the INA4290A4IRGVR datasheet, INA4290A4IRGVR pinout, INA4290A4IRGVR application, or INA4290A4IRGVR equivalent, key selection criteria include guaranteed 200 V/V gain accuracy (±0.15% max), 160-dB DC CMRR, −40°C to +125°C operation, and QFN-16 package thermal performance for high-density power monitoring designs.

Technical Context

The INA4290A4IRGVR uses a transconductance architecture with current-feedback amplification to achieve 20 µA typical input bias current and 120-V maximum common-mode voltage capability. Its zero-drift topology ensures stable offset drift of ±0.2 µV/°C and enables accurate low-V_SENSE operation down to 20 mV at full bandwidth.

This device operates exclusively in high-side sensing configurations due to its internal topology, supports simultaneous four-channel monitoring with >140 dB channel separation at 100 kHz, and maintains 85-dB AC CMRR at 50 kHz-critical for noise-immune telecom and server PSU current telemetry.

Key Specifications

Pinout & Package

The INA4290A4IRGVR is housed in a 4 mm × 4 mm, 16-pin QFN package (RGV) with exposed thermal pad. The package supports efficient heat dissipation (R_θJA = 45.9°C/W) and is compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA4290A3IRGVR and INA4290A5IRGVR, the INA4290A4IRGVR strikes a balance between bandwidth retention (850 kHz) and sensitivity (200×), making it ideal for 20–50 mV sense voltage ranges common in 48-V telecom and server power stages.

Availability

INA4290A4IRGVR is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) current telemetry, and active antenna system (AAS) element supervision requiring stable component supply and long-term production continuity.

Supply support for INA4290A4IRGVR 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 designed specifically for high-accuracy, high-common-mode current sensing in next-generation telecom infrastructure, data center power systems, and industrial energy monitoring-emphasizing zero-drift stability, multichannel integration, and robust EMC performance.

FAQ

What is the maximum common-mode voltage supported by the INA4290A4IRGVR?

The INA4290A4IRGVR supports a maximum operational common-mode voltage of 120 V and a survival rating of +122 V. Its minimum common-mode voltage depends on supply voltage (e.g., ≥2.7 V at VS = 2.7 V), and operation is restricted to high-side sensing only per its internal transconductance architecture. This makes the INA4290A4IRGVR suitable for 48-V and 60-V industrial bus monitoring but not for negative-rail or bidirectional applications.

Does the INA4290A4IRGVR require external gain-setting resistors?

No, the INA4290A4IRGVR uses a precision internal resistor network to fix its gain at 200 V/V. Texas Instruments explicitly advises against adding external resistors to modify gain, as absolute resistor values vary significantly across units-even though their ratio remains tightly matched. The INA4290A4IRGVR achieves ±0.15% max gain error and 5 ppm/°C drift without any external components, simplifying layout and improving long-term stability.

How many independent current-sensing channels does the INA4290A4IRGVR provide?

The INA4290A4IRGVR integrates four fully independent, matched current-sense amplifier channels in a single 4 mm × 4 mm QFN package. Each channel has dedicated IN+, IN−, and OUT pins, with >140 dB channel separation at 100 kHz. This eliminates inter-channel crosstalk in multi-phase power supplies and allows simultaneous monitoring of four distinct power rails-such as CPU core, SoC I/O, memory, and auxiliary rails-without additional ICs.

What is the quiescent current consumption of the INA4290A4IRGVR across temperature?

The INA4290A4IRGVR draws 1.25 mA (typical) to 1.8 mA (max) total quiescent current across −40°C to +125°C. At 25°C and 5-V supply, typical IQ is 1.25 mA; it increases to ~1.6 mA at 125°C and remains stable across common-mode voltages up to 120 V. This low, predictable power draw enables always-on current monitoring in thermally constrained telecom and server modules without significant self-heating impact.

Can the INA4290A4IRGVR be used for bidirectional current sensing?

No, the INA4290A4IRGVR is designed exclusively for unidirectional, high-side current sensing. Its internal topology and pin configuration do not support negative differential input voltages or reverse current detection. The device requires IN+ to be at a higher potential than IN−, and its output cannot swing below GND + 25 mV. For bidirectional applications, designers must select purpose-built devices such as the INA229 or INA240 series, which feature symmetric input ranges and rail-to-rail output capability.