LTC4355 - Positive High Voltage Ideal Diode-OR with Input Supply and Fuse Monitors


  • Replaces Power Schottky Diodes
  • Controls N-Channel MOSFETs
  • 0.3μs Turn-Off Time Limits Peak Fault Current
  • Wide Operating Voltage Range: 9V to 80V
  • Smooth Switchover without Oscillation
  • No Reverse DC Current
  • Monitors VIN, Fuse, and MOSFET Diode
  • Available in 14-Lead (4mm × 3mm) DFN, 16-Lead MS and SO Packages

Typical Application

LTC4355 Typical Application
LTC4355 Typical Application


The LTC4355 is a positive voltage ideal diode-OR controller that drives two external N-channel MOSFETs. Forming the diode-OR with N-channel MOSFETs instead of Schottky diodes reduces power consumption, heat dissipation and PC board area.

With the LTC4355, power sources can easily be ORed together to increase total system reliability. The LTC4355 can diode-OR two positive supplies or the return paths of two negative supplies, such as in a –48V system.

In the forward direction the LTC4355 controls the voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If a power source fails or is shorted, fast turnoff minimizes reverse current transients.

Power fault detection indicates if the input supplies are not in regulation, the inline fuses are blown, or the voltages across the MOSFETs are greater than the fault threshold.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
LTC4355CDE#PBF 4x3 DFN-14 DE C 05-08-1708 Yes
LTC4355CDE#TRPBF 4x3 DFN-14 DE C 05-08-1708 Yes
LTC4355CMS#PBF MS-16 MS C 05-08-1669 Yes
LTC4355CMS#TRPBF MS-16 MS C 05-08-1669 Yes
LTC4355CS#PBF SO-16 S C 05-08-1610 (S16) Yes
LTC4355CS#TRPBF SO-16 S C 05-08-1610 (S16) Yes
LTC4355HMS#PBF MS-16 MS H 05-08-1669 Yes
LTC4355HMS#TRPBF MS-16 MS H 05-08-1669 Yes
LTC4355IDE#PBF 4x3 DFN-14 DE I 05-08-1708 Yes
LTC4355IDE#TRPBF 4x3 DFN-14 DE I 05-08-1708 Yes
LTC4355IMS#PBF MS-16 MS I 05-08-1669 Yes
LTC4355IMS#TRPBF MS-16 MS I 05-08-1669 Yes
LTC4355IS#PBF SO-16 S I 05-08-1610 (S16) Yes
LTC4355IS#TRPBF SO-16 S I 05-08-1610 (S16) Yes

LTC4355 Package Drawing
LTC4355 Package Drawing
LTC4355 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
LTC4355CDE#PBF 4x3 DFN-14 C $3.55 $2.50 Yes
LTC4355CDE#TRPBF 4x3 DFN-14 C $2.60 Yes
LTC4355CMS#PBF MS-16 C $3.55 $2.50 Yes
LTC4355CMS#TRPBF MS-16 C $2.60 Yes
LTC4355CS#PBF SO-16 C $3.55 $2.50 Yes
LTC4355CS#TRPBF SO-16 C $2.60 Yes
LTC4355HMS#PBF MS-16 H $4.71 $3.30 Yes
LTC4355HMS#TRPBF MS-16 H $3.36 Yes
LTC4355IDE#PBF 4x3 DFN-14 I $4.30 $3.00 Yes
LTC4355IDE#TRPBF 4x3 DFN-14 I $3.10 Yes
LTC4355IMS#PBF MS-16 I $4.30 $3.00 Yes
LTC4355IMS#TRPBF MS-16 I $3.10 Yes
LTC4355IS#PBF SO-16 I $4.30 $3.00 Yes
LTC4355IS#TRPBF SO-16 I $3.10 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.

Part Number Description Price Documentation
DC1066A LTC4355 Demoboard: Positive High Voltage Ideal Diode-OR $50.00
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  • High Availability Systems
  • AdvancedTCA® (ATCA) Systems
  • +48V and –48V Distributed Power Systems
  • Telecom Infrastructure

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