LTC4353 - Dual Low Voltage Ideal Diode Controller


  • Low Loss Replacement for Power Diodes
  • Controls N-Channel MOSFETs
  • 0V to 18V Supply ORing or Holdup
  • 1μs Gate Turn-On and Turn-Off Time
  • Enable Inputs
  • MOSFET On-Status Outputs
  • 16-Lead MSOP and DFN (4mm × 3mm) Packages

Typical Application

LTC4353 Typical Application
LTC4353 Typical Application


The LTC®4353 controls external N-channel MOSFETs to implement an ideal diode function. It replaces two high power Schottky diodes and their associated heat sinks, saving power and board area. The ideal diode function permits low loss power supply ORing and supply holdup applications.

The LTC4353 regulates the forward-voltage drop across the MOSFET to ensure smooth current transfer in diode-OR applications. A fast turn-on reduces the load voltage droop during supply switchover. If the input supply fails or is shorted, a fast turn-off minimizes reverse-current transients.

The controller operates with supplies from 2.9V to 18V. If both supplies are below 2.9V, an external supply is needed at the VCC pin. Enable inputs can be used to turn off the MOSFET and put the controller in a low current state. Status outputs indicate whether the MOSFETs are on or off.


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
LTC4353CDE#PBF 4x3 DFN-16 DE C 05-08-1732 Yes
LTC4353CDE#TRPBF 4x3 DFN-16 DE C 05-08-1732 Yes
LTC4353CMS#PBF MS-16 MS C 05-08-1669 Yes
LTC4353CMS#TRPBF MS-16 MS C 05-08-1669 Yes
LTC4353IDE#PBF 4x3 DFN-16 DE I 05-08-1732 Yes
LTC4353IDE#TRPBF 4x3 DFN-16 DE I 05-08-1732 Yes
LTC4353IMS#PBF MS-16 MS I 05-08-1669 Yes
LTC4353IMS#TRPBF MS-16 MS I 05-08-1669 Yes

LTC4353 Package Drawing
LTC4353 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
LTC4353CDE#PBF 4x3 DFN-16 C $4.93 $3.45 Yes
LTC4353CDE#TRPBF 4x3 DFN-16 C $3.51 Yes
LTC4353CMS#PBF MS-16 C $4.93 $3.45 Yes
LTC4353CMS#TRPBF MS-16 C $3.51 Yes
LTC4353IDE#PBF 4x3 DFN-16 I $5.64 $3.95 Yes
LTC4353IDE#TRPBF 4x3 DFN-16 I $4.01 Yes
LTC4353IMS#PBF MS-16 I $5.64 $3.95 Yes
LTC4353IMS#TRPBF MS-16 I $4.01 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
DC1926A LTC4353DE Demoboard | Dual Low Voltage Ideal Diode Controller $75.00
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  • Redundant Power Supplies
  • Supply Holdup
  • High Availability Systems and Servers
  • Telecom and Network Infrastructure

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