MP2338 – 28V, 3A, SYNCHRONOUS STEP-DOWN CONVERTER W/ INTERNAL MOSFETS

MP2338 Rev. 1.0

www.MonolithicPower.com

17

12/11/2020

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2020 MPS. All Rights Reserved.

Start-Up and Shutdown

If both VIN and EN exceed their respective

thresholds, the chip starts. The reference block

starts first, generating a stable reference

voltage and currents, and then the internal

converter is enabled. The converter provides a

stable supply for the remaining circuits.

Three events can shut down the chip: EN going

low, VIN going low, and thermal shutdown. The

shutdown procedure starts by initially blocking

the signaling path to avoid any fault triggering.

Then the internal supply rail is pulled down.

Thermal Shutdown

Thermal shutdown prevents the chip from

operating at exceedingly high temperatures. If

the silicon die temperature exceeds 150°C, the

whole chip shuts down. When the temperature

falls below its lower threshold (typically 130°C),

the chip is enabled again.