Texas Instruments provides a recommended PCB layout in the datasheet, but it's also recommended to follow general high-frequency PCB design guidelines, such as using a solid ground plane, minimizing trace lengths, and using bypass capacitors to reduce noise and ringing.
Proper biasing is critical for the LMH6586VS/NOPB. Ensure that the input voltage (VCC) is within the recommended range (4.5V to 5.5V), and that the output voltage (VOUT) is set to the desired level using the feedback resistors (RFB1 and RFB2). Also, ensure that the input and output capacitors (CIN and COUT) are properly selected and placed close to the device.
The maximum output current capability of the LMH6586VS/NOPB is 1.5A, but this can be limited by the thermal performance of the device and the PCB. Ensure that the device is properly heatsinked and that the PCB is designed to handle the maximum expected current.
Oscillations or instability issues can be caused by a variety of factors, including poor PCB layout, inadequate decoupling, or incorrect component selection. To troubleshoot, check the PCB layout for any issues, ensure that the input and output capacitors are properly selected and placed, and verify that the feedback resistors are correctly sized. Also, check for any signs of overheating or thermal issues.
While the LMH6586VS/NOPB is primarily designed as a linear regulator, it can be used in switching regulator applications with some caveats. However, it's essential to ensure that the device is properly designed and laid out to handle the high-frequency switching, and that the output filter is properly sized to handle the switching noise.
LMH6586VS/NOPB datasheet
by Texas Instruments
