LT4320/LT4320-1 - Ideal Diode Bridge Controller


  • Maximizes Power Efficiency
  • Eliminates Thermal Design Problems
  • DC to 600Hz
  • 9V to 72V Operating Voltage Range
  • IQ = 1.5mA (Typical)
  • Maximizes Available Voltage
  • Available in 8-Lead (3mm × 3mm) DFN, 12-Lead MSOP and 8-Lead PDIP Packages

Typical Application

LT4320 Typical Application
LT4320 Typical Application


The LT®4320/LT4320-1 are ideal diode bridge controllers that drive four N-channel MOSFETs, supporting voltage rectification from DC to 600Hz typical. By maximizing available voltage and reducing power dissipation (see thermograph comparison below), the ideal diode bridge simplifies power supply design and reduces power supply cost, especially in low voltage applications.

An ideal diode bridge also eliminates thermal design problems, costly heat sinks, and greatly reduces PC board area. The LT4320’s internal charge pump supports an all- NMOS design, which eliminates larger and more costly PMOS switches. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients.

The LT4320 is designed for DC to 60Hz typical voltage rectification, while the LT4320-1 is designed for DC to 600Hz typical voltage rectification. Higher frequencies of operation are possible depending on MOSFET size and operating load current.


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
LT4320HDD-1#PBF 3x3 DFN-8 DD H 05-08-1698 Yes
LT4320HDD-1#TRPBF 3x3 DFN-8 DD H 05-08-1698 Yes
LT4320HDD#PBF 3x3 DFN-8 DD H 05-08-1698 Yes
LT4320HDD#TRPBF 3x3 DFN-8 DD H 05-08-1698 Yes
LT4320HMSE-1#PBF MS-12E MSE H 05-08-1666 Yes
LT4320HMSE-1#TRPBF MS-12E MSE H 05-08-1666 Yes
LT4320HMSE#PBF MS-12E MSE H 05-08-1666 Yes
LT4320HMSE#TRPBF MS-12E MSE H 05-08-1666 Yes
LT4320HN8-1#PBF N-8 N H 05-08-1510 (N8) Yes
LT4320HN8#PBF N-8 N H 05-08-1510 (N8) Yes
LT4320IDD-1#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT4320IDD-1#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT4320IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT4320IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT4320IMSE-1#PBF MS-12E MSE I 05-08-1666 Yes
LT4320IMSE-1#TRPBF MS-12E MSE I 05-08-1666 Yes
LT4320IMSE#PBF MS-12E MSE I 05-08-1666 Yes
LT4320IMSE#TRPBF MS-12E MSE I 05-08-1666 Yes
LT4320IN8-1#PBF N-8 N I 05-08-1510 (N8) Yes
LT4320IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT4320MPMSE-1#PBF MS-12E MSE MP 05-08-1666 Yes
LT4320MPMSE-1#TRPBF MS-12E MSE MP 05-08-1666 Yes
LT4320MPMSE#PBF MS-12E MSE MP 05-08-1666 Yes
LT4320MPMSE#TRPBF MS-12E MSE MP 05-08-1666 Yes

LT4320 Package Drawing
LT4320 Package Drawing
LT4320 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
LT4320HDD-1#PBF 3x3 DFN-8 H $5.36 $3.75 Yes
LT4320HDD-1#TRPBF 3x3 DFN-8 H $5.42 $3.81 Yes
LT4320HDD#PBF 3x3 DFN-8 H $4.93 $3.45 Yes
LT4320HDD#TRPBF 3x3 DFN-8 H $4.99 $3.51 Yes
LT4320HMSE-1#PBF MS-12E H $5.36 $3.75 Yes
LT4320HMSE-1#TRPBF MS-12E H $5.42 $3.81 Yes
LT4320HMSE#PBF MS-12E H $4.93 $3.45 Yes
LT4320HMSE#TRPBF MS-12E H $4.99 $3.51 Yes
LT4320HN8-1#PBF N-8 H $6.51 $4.56 Yes
LT4320HN8#PBF N-8 H $6.10 $4.27 Yes
LT4320IDD-1#PBF 3x3 DFN-8 I $4.64 $3.25 Yes
LT4320IDD-1#TRPBF 3x3 DFN-8 I $3.31 Yes
LT4320IDD#PBF 3x3 DFN-8 I $4.21 $2.95 Yes
LT4320IDD#TRPBF 3x3 DFN-8 I $3.01 Yes
LT4320IMSE-1#PBF MS-12E I $4.64 $3.25 Yes
LT4320IMSE-1#TRPBF MS-12E I $3.31 Yes
LT4320IMSE#PBF MS-12E I $4.21 $2.95 Yes
LT4320IMSE#TRPBF MS-12E I $3.01 Yes
LT4320IN8-1#PBF N-8 I $5.64 $3.95 Yes
LT4320IN8#PBF N-8 I $5.21 $3.65 Yes
LT4320MPMSE-1#PBF MS-12E MP $13.93 $9.75 Yes
LT4320MPMSE-1#TRPBF MS-12E MP $13.99 $9.81 Yes
LT4320MPMSE#PBF MS-12E MP $12.64 $8.85 Yes
LT4320MPMSE#TRPBF MS-12E MP $12.70 $8.91 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
DC1823B LT4320IDD Demo Board | 1.2kW Ideal Diode Bridge Full-Wave Rectifier [9V to 40V, 30A] $75.00
DC1902B LT4320IDD Demo Board | 200W Ideal Diode Bridge Full-Wave Rectifier [9V to 60V, 3.5A] $75.00
DC2047A-A LT4276B/LT4321 Demo Board | PoE+ (25W, 12V/1.9A) PD with DC/DC, Ideal Diode Bridge and 9V-57V AUX $95.00
DC2465A LT4320IDD-1 3-Phase Ideal Diode Bridge Rectifier [9VAC to 48VAC L-L, 25A] $125.00
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Click here to view our complete list of demo boards


  • Security Cameras
  • Terrestrial or Airborne Power Distribution Systems
  • Power-over-Ethernet Powered Device with a Secondary Input
  • Polarity-Agnostic Power Input
  • Diode Bridge Replacement

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