Overview
The OPA567AIRHGR from Texas Instruments is a low-cost, high-current operational amplifier designed to drive a wide variety of loads while operating on low-voltage supplies. It is particularly suited for applications requiring high output current and rail-to-rail input and output swing. The OPA567 operates from either single or dual supplies, offering design flexibility, and is unity gain stable, eliminating phase inversion problems common in some power amplifiers. It features an exposed thermal pad for enhanced thermal and electrical characteristics and is packaged in a compact 5mm x 5mm Quad Flatpack No-lead (QFN) package.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage Range | 2.7 | 5.5 | V | |
| Output Current | 2 | A | ||
| Input Offset Voltage | ±0.5 | ±2 | mV | |
| Input Bias Current | ±1 | ±10 | pA | |
| Input Voltage Noise Density | 12 | nV/√Hz (at f = 1kHz) | ||
| Operating Temperature Range | -40 | 85 | °C | |
| Quiescent Current | 3.4 | 6 | mA (at VS = 5V, ILIMIT = 200mA) | |
| Thermal Flag Junction Temperature | 147 | °C (alarm threshold) |
Key Features
- High Output Current: Up to 2A
- Rail-to-Rail I/O: Output swing within 300mV of the supply rails
- Thermal Protection: Thermal flag warns of thermal overstress
- Adjustable Current Limit: Set with an external resistor or digitally via a DAC
- Current Limit and Thermal Flags: IFLAG and TFLAG pins for monitoring current limit and thermal conditions
- Low Supply Voltage Operation: From 2.7V to 5.5V
- Shutdown Function with Output Disable: Enable pin for power saving and load protection
- Compact Package: 5mm x 5mm QFN package with an exposed thermal pad
Applications
The OPA567 is versatile and can be used in various configurations, including non-inverting amplifiers, inverting amplifiers, and other op-amp circuits. It is particularly suitable for applications requiring high current drive, such as:
- Industrial control systems
- Automotive systems
- Medical devices
- Aerospace and defense systems
- Power management and distribution systems
Q & A
- What is the maximum output current of the OPA567?
The OPA567 can deliver up to 2A of output current.
- What is the operating temperature range of the OPA567?
The OPA567 operates over the industrial temperature range of –40°C to +85°C.
- How is the current limit set on the OPA567?
The current limit can be set using an external resistor connected between the ISET pin and the negative supply (V–), or digitally adjusted via a DAC.
- What is the purpose of the TFLAG pin on the OPA567?
The TFLAG pin is a thermal flag that indicates thermal overstress when the junction temperature exceeds safe limits.
- Can the OPA567 operate from a single supply?
Yes, the OPA567 can operate from either a single supply or dual supplies, with a voltage range of 2.7V to 5.5V.
- How does the shutdown function work on the OPA567?
The output can be disabled using the Enable pin, which saves power and protects the load. The OPA567 is enabled at logic levels greater than 2.5V and disabled at levels less than 0.8V.
- What is the significance of the IFLAG pin on the OPA567?
The IFLAG pin indicates when the part is in current limit, providing a signal compatible with standard logic in single-supply applications.
- What package type is the OPA567 available in?
The OPA567 is available in a 5mm x 5mm Quad Flatpack No-lead (QFN) package with an exposed thermal pad.
- How does the rail-to-rail I/O feature benefit the OPA567?
The rail-to-rail I/O feature allows the OPA567 to swing closer to the supply rails, both on the input and output, enhancing its performance in low-voltage applications.
- What precautions should be taken when handling the OPA567?
The OPA567 is sensitive to electrostatic discharge (ESD). It is recommended to handle the device with appropriate precautions to avoid damage.
