LMR38020 SIMPLE SWITCHER® Synchronous Buck Converter

Texas Instruments' LMR38020 is a synchronous buck converter that is designed to regulate over a wide input voltage range. This minimizes the need for external surge suppression components. The LMR38020 operates during input voltage dips as low as 4.2 V at nearly 100% duty-cycle if needed, making this device ideal for wide input industrial applications and MHEV/EV systems. The converter uses precision enable to provide flexibility by allowing a direct connection to the wide input voltage or precise control over device startup and shutdown. The power-good flag, with built-in filtering and delay, offers a true indication of system status eliminating the need for an external supervisor.

The LMR38020 incorporates a pseudo-random spread spectrum from minimal EMI and switching frequency can be configured between 200 kHz and 2.2 MHz to avoid noise-sensitive frequency bands. The frequency can be selected for improved efficiency at low operating frequencies or a smaller solution size at high operating frequencies. The device has built-in protection features including cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation. The converter is available in an 8-pin HSOIC PowerPAD™ package.