Texas Instruments OPA544F/500

Overview

OPA544F/500 from Texas Instruments (formerly Burr-Brown) is a high-voltage, high-current operational amplifier designed for demanding power-driving applications. It delivers ≥2A continuous output current, operates from ±10V to ±35V supplies, and features 8V/µs slew rate, FET-input bias current ≤100pA, and thermal shutdown protection. It drives motor loads, programmable power supplies, and magnetic deflection coils in industrial motion control systems.

For engineers reviewing the OPA544F/500 datasheet, OPA544F/500 pinout, OPA544F/500 application, or OPA544F/500 equivalent, key selection criteria include safe operating area (SOA) compliance at elevated junction temperatures, output voltage swing under 2A load, thermal resistance θ_JA with PCB copper area, and compatibility with reactive or EMF-generating loads requiring external clamp diodes.

Technical Context

The OPA544F/500 integrates high-performance FET input stage with a robust bipolar output stage on a single monolithic die, enabling precision input characteristics and high-power delivery. Its internal current limit (~4A at 25°C, decreasing with temperature) and thermal shutdown (triggering ~155°C) operate independently to protect against overload and sustained dissipation.

It supports unbalanced supply configurations (e.g., –6V/+65V), maintains linear common-mode range up to (V⁺)–6V and (V^–)+6V, and requires external output compensation (e.g., 1Ω + 0.01µF) for stability with complex or highly capacitive loads. The DDPAK/TO-263 (KTT) package uses the exposed tab as V^– connection and thermal path to PCB copper.

Key Specifications

Pinout & Package

The OPA544F/500 is housed in a 5-lead DDPAK/TO-263 (KTT) surface-mount package with an exposed copper thermal tab electrically connected to Pin 1 (V^–). Mounting the tab to ≥4 in² of 1 oz copper reduces θ_JA to ~20°C/W, critical for sustaining 2A output at ambient >60°C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, high-current op amp applications.

Compared with OPA544F/500, OPA547F/500 offers higher continuous current and better thermal metrics in identical packaging, while LM675T trades integrated protection and surface-mount flexibility for lower cost and broader supply tolerance - making each suitable for distinct reliability, layout, and duty-cycle requirements.

Availability

OPA544F/500 is available at Aetrix Electronics and suitable for motor driver, programmable power supply, and servo amplifier applications requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.

Supply support for OPA544F/500 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 acquired Burr-Brown in 2000 and maintains its precision analog portfolio, emphasizing high-performance op amps, data converters, and power management ICs for industrial and instrumentation markets.

The OPA544F/500 belongs to TI's high-voltage, high-current operational amplifier family, engineered specifically for applications demanding robust power delivery with precision input characteristics and built-in fault protection.

FAQ

What is the maximum continuous output current specification for the OPA544F/500?

The OPA544F/500 is specified for ≥2A continuous output current under conditions of TCASE = +25°C and VS = ±35V. Actual sustainable current depends on thermal design: with adequate PCB copper area (≥4 in²), it maintains 2A output at ambient temperatures up to +60°C before thermal limiting engages. The device's SOA curve defines safe operating boundaries across voltage–current combinations, and short-circuit current peaks at ~4A but triggers thermal shutdown if sustained.

Does the OPA544F/500 require external compensation, and if so, what configuration is recommended?

Yes, the OPA544F/500 requires external output-stage compensation for stability with reactive or capacitive loads. The datasheet recommends a 1Ω resistor in series with a 0.01µF capacitor connected directly between the output (Pin 4) and ground. This network mitigates potential oscillation caused by complex load impedances such as motor windings or long cables. Compensation values may need minor adjustment depending on specific load characteristics, and layout should minimize parasitic inductance in the compensation path.

How is thermal management implemented in the OPA544F/500 DDPAK package?

The OPA544F/500 uses a DDPAK/TO-263 (KTT) package with an exposed copper thermal tab that is internally connected to Pin 1 (V^–). Effective thermal management requires soldering this tab to a minimum 4 in² area of 1 oz copper on the PCB, which reduces θ_JA from 65°C/W (no heatsink) to ~20°C/W. Thermal resistance from junction to case (θ_JC) is 2.7°C/W for AC operation. Junction temperature must remain ≤150°C; thermal shutdown activates at ~155°C as a final safety measure.

Can the OPA544F/500 operate with asymmetric power supplies, and what are the limits?

Yes, the OPA544F/500 supports unbalanced supplies: the total voltage between V⁺ and V^– may range from 20V to 70V, and individual rails need not be symmetrical. For example, a –6V/V⁺ = +65V configuration is valid. However, the common-mode input range extends only to (V⁺)–6V and (V^–)+6V, and short-circuit protection margin decreases at higher |V⁺–V^–| due to increased V_CE stress. Operation outside ±35V total requires careful SOA verification.

What protection features are integrated into the OPA544F/500, and how do they behave under fault conditions?

The OPA544F/500 integrates two independent protection mechanisms: (1) Internal current limiting, set to ~4A at 25°C and reduced with rising junction temperature per the "Current Limit vs Temperature" curve; and (2) Thermal shutdown, activating at ~155°C junction temperature. During a sustained short-circuit, current limiting may be exceeded, causing thermal shutdown to engage - resulting in duty-cycled output until fault removal. Neither feature guarantees survival under indefinite short-circuit at maximum supply voltage without external current limiting or foldback.