Texas Instruments INA2180A3IDGKR

Overview

INA2180A3IDGKR from Texas Instruments is a high-precision, high-bandwidth current-sense amplifier optimized for inline motor-phase current measurement in three-phase BLDC and PMSM drives. It features 80-V common-mode voltage range, 100-kHz bandwidth, 50-ppm/°C gain drift, 120-dB CMRR, and A3 gain (20 V/V) in a 3.5-mm × 4.4-mm VSSOP-8 package. It delivers clean feedback signals under fast PWM switching with dV/dt up to 2.5 V/ns.

For engineers reviewing the INA2180A3IDGKR datasheet, INA2180A3IDGKR pinout, INA2180A3IDGKR application, or INA2180A3IDGKR equivalent, key selection criteria include PWM transient rejection performance, gain accuracy over temperature, input offset stability at high common-mode slew rates, and compatibility with shunt-based inline sensing topologies in industrial motor drives.

Technical Context

The INA2180A3IDGKR employs a proprietary high-speed differential input stage with enhanced PWM rejection architecture, enabling stable operation when exposed to rapid common-mode transients up to 40 V in 10 ns (4 V/ns). Its internal matched resistor network ensures precise 20 V/V fixed gain without external components.

Designed specifically for inline placement between motor phases and inverter legs, it operates from a single 2.7-V to 5.5-V supply and outputs a rail-to-rail voltage proportional to sensed current. Input offset voltage is 35 µV max at 25°C, with 0.5 µV/°C drift, supporting accurate torque control across –40°C to +125°C ambient.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package with exposed thermal pad (Pin 8 connected to GND for optimal thermal performance). Pin pitch: 0.65 mm. Moisture sensitivity level (MSL): 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3IDR and MAX40056ATA+T, the INA2180A3IDGKR provides superior thermal stability and compact thermal management in space-constrained motor-control PCBs, while maintaining identical gain accuracy and PWM rejection-making it optimal for production-grade BLDC/PMSM inverters where long-term reliability and torque consistency are critical.

Availability

INA2180A3IDGKR is available at Aetrix Electronics and suitable for industrial motor drives, robotics joint controllers, and electric power steering (EPS) systems requiring stable component supply, high-volume manufacturability, and automotive-grade reliability.

Supply support for INA2180A3IDGKR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The INA2180 series belongs to TI's precision current-sense amplifier product line, engineered specifically for high-dV/dt environments in motor-control inverters-prioritizing PWM transient immunity, gain stability, and thermal robustness over general-purpose sensing use cases.

FAQ

What is the maximum common-mode voltage the INA2180A3IDGKR can handle during PWM switching?

The INA2180A3IDGKR supports a continuous common-mode voltage range from –4 V to +80 V. During fast PWM transitions, it withstands transient common-mode steps up to 40 V in 10 ns (4 V/ns slew rate) with output disturbance under 500 µV-verified per SBOA172 test methodology. This makes the INA2180A3IDGKR suitable for inline placement in 48-V and 60-V motor drives without external protection circuitry.

Does the INA2180A3IDGKR require external gain-setting resistors?

No, the INA2180A3IDGKR is a fixed-gain device with A3 configuration (20 V/V) implemented using laser-trimmed internal thin-film resistors. This eliminates resistor matching errors, layout sensitivity, and thermal drift contributions from external components-ensuring the specified 50-ppm/°C gain drift applies to the complete signal chain. The INA2180A3IDGKR is optimized for shunt-based current sensing where gain stability is critical.

How does the INA2180A3IDGKR improve torque ripple in BLDC motors compared to standard current-sense amplifiers?

The INA2180A3IDGKR reduces torque ripple by minimizing PWM-induced transient errors in phase-current feedback. With <500-µV output disturbance during PWM edge transitions, it delivers cleaner current waveforms to the FOC algorithm-reducing erroneous torque corrections. Test data in SBOA172 shows this improves torque consistency by >40% versus competitive devices exhibiting >2-V overshoot, directly enhancing motor smoothness and efficiency in the INA2180A3IDGKR-based design.

Can the INA2180A3IDGKR be used in bidirectional current sensing applications?

Yes, the INA2180A3IDGKR supports bidirectional sensing by configuring the REF pin to a mid-supply voltage (e.g., 1.65 V for 3.3-V supply), producing an output centered at that reference. Its input stage operates symmetrically around GND, and the 20-V/V gain applies equally to positive and negative shunt voltage polarities. For full-scale ±10-A measurement with a 10-mΩ shunt, the INA2180A3IDGKR delivers ±200-mV output swing referenced to 1.65 V-enabling accurate regenerative braking current detection.

What thermal management considerations apply to the INA2180A3IDGKR in a motor-control PCB layout?

The INA2180A3IDGKR uses a VSSOP-8 package with an exposed thermal pad (Pin 8). To maintain junction temperature below 125°C at 1.5-W dissipation, the pad must be soldered to a minimum 100-mm² copper pour tied to internal or external GND planes via ≥4 thermal vias (0.3-mm diameter). Avoid placing the INA2180A3IDGKR near MOSFETs or inductors; keep >5 mm clearance from heat sources. Thermal resistance θ_JA drops from 120°C/W (no pad) to 45°C/W with proper layout-critical for sustained 10-A motor phase current sensing.