LTC4418 - Dual Channel Prioritized PowerPath Controller


  • Selects Highest Priority Supply from Two Inputs
  • Blocks Reverse and Cross Conduction Currents
  • Wide Operating Voltage Range: 2.5V to 40V
  • –42V Protection Against Reverse Connection
  • 60V Tolerant V1, V2 Inputs
  • Adjustable Input Validation Time
  • Fast Switchover Minimizes Output Voltage Droop
  • Low 26µA Operating Current
  • ±1.5% Input Overvoltage/Undervoltage Protection
  • Adjustable Overvoltage/Undervoltage Hysteresis
  • Cascadable for Additional Input Supplies
  • 20-Lead 4mm × 4mm QFN Package
  • Click here to start your design with the LTC4418 Online Design Tool!

Typical Application

LTC4418 Typical Application
LTC4418 Typical Application


The LTC®4418 connects one of two valid power supplies to a common output based on priority and validity. Priority is defined by pin assignment, with V1 assigned the higher priority and V2 the lower priority. A power supply is defined as valid when its voltage has been within its overvoltage (OV) and undervoltage (UV) window continuously for at least the configured validation time. If the highest priority valid input falls out of the OV/UV window, the channel is immediately disconnected and the other valid input is connected to the common output. Multiple LTC4418s, as well as triple channel LTC4417s, can be cascaded to provide switchover between more than two inputs.

The LTC4418 incorporates fast non-overlap switching circuitry to prevent both reverse and cross conduction while minimizing output droop.  The gate driver includes a 6V clamp to protect external MOSFETs. A controlled soft-start feature minimizes start-up inrush current. Open drain VALID outputs indicate the input supplies have been within their OV/UV window for the duration of the validation time. The validation time can be disabled or adjusted using an external capacitor 


For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4418CUF#PBF 4x4 QFN-20 UF C 05-08-1710 Yes
LTC4418CUF#TRPBF 4x4 QFN-20 UF C 05-08-1710 Yes
LTC4418IUF#PBF 4x4 QFN-20 UF I 05-08-1710 Yes
LTC4418IUF#TRPBF 4x4 QFN-20 UF I 05-08-1710 Yes

LTC4418 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC4418CUF#PBF 4x4 QFN-20 C $3.50 $2.45 Yes
LTC4418CUF#TRPBF 4x4 QFN-20 C $3.56 $2.51 Yes
LTC4418IUF#PBF 4x4 QFN-20 I $4.03 $2.82 Yes
LTC4418IUF#TRPBF 4x4 QFN-20 I $4.09 $2.88 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


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