SIMPLE SWITCHER® power converter 4.2-V to 80-V, 2-A, synchronous buck with 40-µA IQ

The LMR38020

synchronous buck converter is designed to regulate over a wide input voltage range,

minimizing 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 the device an excellent choice for wide input industrial

applications and MHEV/EV systems.

The LMR38020

uses precision enable to provide flexibility by enabling a direct connection to the wide

input voltage or precise control over device start-up 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 device incorporates pseudorandom spread spectrum

for minimal EMI and switching frequency can be configured between 200 kHz and 2.2 MHz to

avoid noise sensitive frequency bands. In addition, the frequency can be selected for

improved efficiency at low operating frequency or smaller solution size at high operating

frequency.

The device has built-in protection features

such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal

shutdown in case of excessive power dissipation. The LMR38020 is available in an 8-pin HSOIC PowerPAD integrated

circuit package.