LTC4357 - Positive High Voltage Ideal Diode Controller


  • Reduces Power Dissipation by Replacing a Power Schottky Diode with an N-Channel MOSFET
  • 0.5μs Turn-Off Time Limits Peak Fault Current
  • Wide Operating Voltage Range: 9V to 80V
  • Smooth Switchover without Oscillation
  • No Reverse DC Current
  • Available in 6-Lead (2mm × 3mm) DFN and 8-Lead MSOP Packages

Typical Application

LTC4357 Typical Application
LTC4357 Typical Application


The LTC®4357 is a positive high voltage ideal diode controller that drives an external N-channel MOSFET to replace a Schottky diode. When used in diode-OR and high current diode applications, the LTC4357 reduces power consumption, heat dissipation, voltage loss and PC board area.

The LTC4357 easily ORs power sources to increase total system reliability. In diode-OR applications, the LTC4357 controls the forward voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients.


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
LTC4357CDCB#PBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC4357CDCB#TRMPBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC4357CDCB#TRPBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LTC4357CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC4357CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC4357HDCB#PBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC4357HDCB#TRMPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC4357HDCB#TRPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LTC4357HMS8#PBF MS-8 MS8 H 05-08-1660 Yes
LTC4357HMS8#TRPBF MS-8 MS8 H 05-08-1660 Yes
LTC4357IDCB#PBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC4357IDCB#TRMPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC4357IDCB#TRPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LTC4357IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LTC4357IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes
LTC4357MPMS8 MS-8 MS8 MP 05-08-1660 No
LTC4357MPMS8#PBF MS-8 MS8 MP 05-08-1660 Yes
LTC4357MPMS8#TR MS-8 MS8 MP 05-08-1660 No
LTC4357MPMS8#TRPBF MS-8 MS8 MP 05-08-1660 Yes

LTC4357 Package Drawing
LTC4357 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
LTC4357CDCB#PBF 2x3 DFN-6 C $2.43 Yes
LTC4357CDCB#TRMPBF 2x3 DFN-6 C $2.43 $1.75 Yes
LTC4357CDCB#TRPBF 2x3 DFN-6 C $2.43 $1.70 Yes
LTC4357CMS8#PBF MS-8 C $2.43 $1.70 Yes
LTC4357CMS8#TRPBF MS-8 C $1.75 Yes
LTC4357HDCB#PBF 2x3 DFN-6 H $3.36 Yes
LTC4357HDCB#TRMPBF 2x3 DFN-6 H $3.36 $2.40 Yes
LTC4357HDCB#TRPBF 2x3 DFN-6 H $3.36 $2.35 Yes
LTC4357HMS8#PBF MS-8 H $3.36 $2.35 Yes
LTC4357HMS8#TRPBF MS-8 H $2.41 Yes
LTC4357IDCB#PBF 2x3 DFN-6 I $2.91 Yes
LTC4357IDCB#TRMPBF 2x3 DFN-6 I $2.91 $2.09 Yes
LTC4357IDCB#TRPBF 2x3 DFN-6 I $2.91 $2.04 Yes
LTC4357IMS8#PBF MS-8 I $2.91 $2.04 Yes
LTC4357IMS8#TRPBF MS-8 I $2.09 Yes
LTC4357MPMS8 MS-8 MP $7.29 $5.10 No
LTC4357MPMS8#PBF MS-8 MP $7.29 $5.10 Yes
LTC4357MPMS8#TR MS-8 MP $5.16 No
LTC4357MPMS8#TRPBF MS-8 MP $5.16 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
DC1203A LTC4357 Positive High Voltage Ideal Diode Controller $50.00
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