The TPS543B22 DC/DC converter is a synchronous buck converter designed to provide up to a 20-A output. The input (VIN) is rated for 4 V to 18 V. Table 1-1 provides the rated input voltage and output current range for the evaluation module.

The high-side and low-side MOSFETs are incorporated inside the TPS543B22 package along with the gate-drive circuitry. The low drain-to-source on-resistance of the MOSFET allows the TPS543B22 to achieve high efficiencies and helps keep the junction temperature low at the rated output current. Fixed frequency advanced current mode control allows you to synchronize the regulators to an external clock source. An external divider allows for an adjustable output voltage. The TPS543B22 FSEL and MODE pins provide selectable switching frequency, soft-start time, current limit, and internal compensation. Lastly, the TPS543B22 includes an enable pin and a power-good output, which can be used for sequencing multiple regulators.

This evaluation module includes two designs with the TPS543B22. The first design is designed to demonstrate the small printed-circuit-board areas that can be achieved when designing with the TPS543B22 regulator. The small area design fits within 275 mm². The second design is designed to demonstrate the high efficiency that can be achieved when designing with the TPS543B22 regulator. The second design also includes jumpers that can be used to easily evaluate the features of the TPS543B22.