SLVSES4D September 2019 – June 2024 TPS54J060
PRODUCTION DATA
A series BOOT resistor can help reduce the overshoot at the SW pin. As a best practice, include a 0-Ω series BOOT resistor in the design for 12-V or higher input applications. The BOOT resistor can be used to reduce the voltage overshoot on the SW pin to within the Absolute Maximum Ratings in case the overshoot is higher than normal due to parasitic inductance in PCB layout. Including a 0-Ω BOOT resistor is recommended with external VCC as the SW node overshoot is increased. The recommended BOOT resistor value to decrease the SW pin overshoot is 4.7 Ω.
An RC snubber on the SW pin can also help reduce the high frequency voltage spikes and ringing at the SW pin. Recommended snubber values are 6.8 Ω and 220 pF. The best value for these components can vary with different layouts but these recommended values must provide a good starting point. In order for the RC snubber to be as effective as possible, it must be placed on the same side as the IC and be as close as possible to the SW pins with a very low impedance return to PGND pins.