LTC4352 - Low Voltage Ideal Diode Controller with Monitoring


  • Low Loss Replacement for Power Diode
  • Controls N-Channel MOSFET
  • 0V to 18V Supply ORing or Holdup
  • 0.5μs Turn-On and Turn-Off Time
  • Undervoltage and Overvoltage Protection
  • Open MOSFET Detect
  • Status and Fault Outputs
  • Hot Swappable
  • Reverse Current Enable Input
  • 12-Pin MSOP and DFN (3mm × 3mm) Packages

Typical Application

LTC4352 Typical Application
LTC4352 Typical Application


The LTC4352 creates a near-ideal diode using an external N-channel MOSFET. It replaces a high power Schottky diode and the associated heat sink, saving power and board area. The ideal diode function permits low loss power ORing and supply holdup applications.

The LTC4352 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 switch-over. If the input supply fails or is shorted, a fast turn-off minimizes reverse currents.

The controller operates with supplies from 2.9V to 18V. For lower voltages, an external supply is needed at the VCC pin. Power passage is disabled during undervoltage or overvoltage conditions. The controller also features an open MOSFET detect circuit that flags excessive voltage drop across the pass transistor in the on state. A REV pin enables reverse current, overriding the diode behavior when desired.


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
LTC4352CDD#PBF 3x3 DFN-12 DD C 05-08-1725 Yes
LTC4352CDD#TRPBF 3x3 DFN-12 DD C 05-08-1725 Yes
LTC4352CMS#PBF MS-12 MS C 05-08-1668 Yes
LTC4352CMS#TRPBF MS-12 MS C 05-08-1668 Yes
LTC4352HDD#PBF 3x3 DFN-12 DD H 05-08-1725 Yes
LTC4352HDD#TRPBF 3x3 DFN-12 DD H 05-08-1725 Yes
LTC4352HMS#PBF MS-12 MS H 05-08-1668 Yes
LTC4352HMS#TRPBF MS-12 MS H 05-08-1668 Yes
LTC4352IDD#PBF 3x3 DFN-12 DD I 05-08-1725 Yes
LTC4352IDD#TRPBF 3x3 DFN-12 DD I 05-08-1725 Yes
LTC4352IMS#PBF MS-12 MS I 05-08-1668 Yes
LTC4352IMS#TRPBF MS-12 MS I 05-08-1668 Yes

LTC4352 Package Drawing
LTC4352 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
LTC4352CDD#PBF 3x3 DFN-12 C $3.57 $2.50 Yes
LTC4352CDD#TRPBF 3x3 DFN-12 C $2.56 Yes
LTC4352CMS#PBF MS-12 C $3.57 $2.50 Yes
LTC4352CMS#TRPBF MS-12 C $2.56 Yes
LTC4352HDD#PBF 3x3 DFN-12 H $4.77 $3.34 Yes
LTC4352HDD#TRPBF 3x3 DFN-12 H $3.40 Yes
LTC4352HMS#PBF MS-12 H $4.77 $3.34 Yes
LTC4352HMS#TRPBF MS-12 H $3.40 Yes
LTC4352IDD#PBF 3x3 DFN-12 I $4.14 $2.90 Yes
LTC4352IDD#TRPBF 3x3 DFN-12 I $2.96 Yes
LTC4352IMS#PBF MS-12 I $4.14 $2.90 Yes
LTC4352IMS#TRPBF MS-12 I $2.96 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
DC1329A LTC4352 Low Voltage Ideal Diode Controller with Monitoring, LT4351 Replacement $50.00
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  • Redundant Power Supplies
  • Supply Holdup
  • Telecom Infrastructure
  • Computer Systems and Servers

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