Overview
The BUF634, produced by Texas Instruments, is a high-speed, unity-gain, open-loop buffer designed for a wide range of applications. It is particularly useful for increasing the output current of operational amplifiers, eliminating thermal feedback, and improving capacitive load drive. The device operates with a low quiescent current of 1.5 mA and can deliver up to ±250 mA of continuous output current. It features a high slew rate of 2000 V/µs and adjustable bandwidth from 30 MHz to 180 MHz. The BUF634 is available in various packages, including SOIC-8, TO-220, and TO-263 (DDPAK), to meet different mechanical and power dissipation requirements.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | ±2.25 | ±18 | V | |
| Output Current | ±250 | mA | ||
| Slew Rate | 2000 | V/µs | ||
| Bandwidth | 30 | 180 | MHz | |
| Quiescent Current (Low IQ Mode) | 1.5 | 2 | mA | |
| Quiescent Current (Wide BW Mode) | 15 | 20 | mA | |
| Thermal Shutdown Temperature | 175 | °C | ||
| Operating Temperature Range | -40 | 125 | °C | |
| Junction Temperature | 150 | °C |
Key Features
- High output current: up to ±250 mA
- High slew rate: 2000 V/µs
- Adjustable bandwidth: 30 MHz to 180 MHz by connecting a resistor between V– and the BW pin
- Low quiescent current: 1.5 mA in low IQ mode
- Wide supply range: ±2.25 V to ±18 V
- Internal current limit and thermal shutdown protection
- Available in various packages: SOIC-8, TO-220, and TO-263 (DDPAK)
Applications
- Valve driver
- Solenoid driver
- Op amp current booster
- Line driver
- Headphone driver
- Video driver
- Motor driver
- Test equipment
- ATE pin driver
Q & A
- What is the maximum output current of the BUF634?
The BUF634 can deliver up to ±250 mA of continuous output current.
- What is the slew rate of the BUF634?
The slew rate of the BUF634 is 2000 V/µs.
- How can the bandwidth of the BUF634 be adjusted?
The bandwidth can be adjusted from 30 MHz to 180 MHz by connecting a resistor between V– and the BW pin.
- What is the quiescent current in low IQ mode?
The quiescent current in low IQ mode is 1.5 mA.
- What is the thermal shutdown temperature of the BUF634?
The thermal shutdown temperature is 175 °C.
- In what packages is the BUF634 available?
The BUF634 is available in SOIC-8, TO-220, and TO-263 (DDPAK) packages.
- What are some common applications of the BUF634?
Common applications include valve drivers, solenoid drivers, op amp current boosters, line drivers, headphone drivers, video drivers, motor drivers, test equipment, and ATE pin drivers.
- What is the operating temperature range of the BUF634?
The operating temperature range is -40 °C to 125 °C.
- Does the BUF634 have internal protection features?
Yes, the BUF634 has internal current limit and thermal shutdown protection.
- What is the supply voltage range for the BUF634?
The supply voltage range is ±2.25 V to ±18 V.
