LS1205ExD33 Series - 18V, 5A eFuse with Programmable Current Limit and Output Voltage Clamp

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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 LS1205E integrated load switch provides an easy circuit protection to power the system. The devices use few external components and provide multiple protection modes. They are a robust defense against overload, short circuit, input voltage surge and excessive inrush current. The switch’s low RDS(ON) helps to reduce power loss during normal operation. Set the current limit level with an external resistor. Protect against input over-voltage events via 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. They are available in low profile 10 leads DFN 3mm x 3mm package.

Features & Benefits:

  • Wide Input Voltage Range from 2.7V to 18V
  • LS1205EV: External Selectable Input Range and Clamping Output Voltage Threshold
  • LS1205EF: Open Drain Fault Indicator FAULT\
  • Output Discharging Function
  • Integrate a 25mΩ Low RDS(ON) Protection Switch
  • External Programmable Soft Start Time
  • External Programmable Current Limit 1∼5Amp
  • Short-circuit Protection
  • Enable Control Pin
  • Thermal Shutdown Protection & Auto Recovery
  • DFN3×3_10L Package
  • Pb-Free RoHS compliant


  • HDD and SSD Drives
  • Adapter Powered Devices
  • PC / Notebook
  • FAN Control
  • Networking

Access specifications, certifications, check availability and order parts below

Catalog #Operation Voltage (V)Vmax (V)Continuous Current (A)Ron (mΩ)Over Current Protection (A)Over Voltage Protection (V)Over Temperature ProtectionReverse BlockingSoft StartOutput DischargeQuiescent Current (µA)Shut Down Current (µA)PackagePartner ECAD ModelsStockSamplesCompare
LS1205EFD332.7 ~ 18205251 ~ 514.4YesN/AAdjustableYes2006.5DFN3x3-10LS1205EFD33CheckOrder
LS1205EVD332.7 ~ 18205251 ~ 53.8/5.7/14.4YesN/AAdjustableYes2006.5DFN3x3-10LS1205EVD33CheckOrder
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