The BUF634 device is a high-speed, unity-gain open-loop buffer recommended for a wide range of applications. The BUF634 can be used inside the feedback loop of op amps to increase output current, eliminate thermal feedback, and improve capacitive load drive.

For low-power applications, the BUF634 operates on 1.5-mA quiescent current with 250-mA output, 2000‑V/µs slew rate, and 30-MHz bandwidth. Bandwidth can be adjusted from 30 MHz to 180 MHz by connecting a resistor between V– and the BW pin; see Figure 6-9 and Figure 6-1. Output circuitry is fully protected by internal current limit and thermal shutdown, making this device rugged and easy to use.

For a simplified circuit diagram of the BUF634 showing the open-loop complementary follower design, see Section 7.2.