LS12052BD33 - LS12052BD33 Series

External overview image
Roll Over to Zoom
Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The LS12052BD33 family of integrated load switches provides an easy circuit protection to power the system. The device uses few external components and provides multiple protection modes. They are a robust defense against overload, short circuit, input voltage surge, excessive inrush current and reverse current blocking with an external NFET. The switch’s low RDS(ON) helps to reduce power loss during normal operation. Current limit level can be set with a single external resistor. Input over voltage events are protected by internal clamp circuitry to a safe output voltage. Programmable soft-start controls the slew rate of the output voltage to limit inrush current during plug in. It integrates thermal fold-back function and over temperature shutdown protection. The BFET pin is provided to drive an external NFET which can be connected “Back to Back” with the LS12052BD33 output. The external NFET gate is driven by BFET to prevent current flow from the load to the source. LS12052BD33 is available in small DFN 3mm x 3mm-10 package.

Features & Benefits:

  • Wide Input Voltage Range from 2.7V to 18V
  • Extremely Low RDS(ON) for the Integrated Protection Switch: 25mΩ
  • External Programmable Soft-Start Time
  • External Programmable Current Limit
  • Support Reverse Current Blocking
  • Short-circuit Protection
  • Fixed Over-voltage 14.4V Output Voltage Clamp
  • Accurate 1.29V EN Pin Turnon Threshold
  • Thermal Shutdown Protection & Auto Recovery
  • DFN3×3_10L Packages
  • Pb-Free RoHS compliant


  • HDD and SSD Drives
  • Adapter Powered Devices
  • Notebook PC
  • PCI, PCIe Cards
  • Industry

Chinese Subtitles - Japanese Subtitles

To request product environmental information, please complete the Product Environmental Information Request Form.