Ideal Diode Bridge
Analog Devices' ideal diode bridge controllers replace the four diodes in a full-wave bridge rectifier with a low loss MOSFET to drastically reduce power dissipation, heat generation, and voltage drop. The Schottky diode bridge rectifier is a classic circuit used for full-wave ac-to-dc rectification and dc polarity correction. Due to the ~0.6 V drop of each diode, the two diodes in the I/O path dissipate power (1.2 W per ampere), radiate heat, raise the ambient temperature, and complicate thermal design. At low input voltages, the two diode drops significantly reduce the voltage available to the downstream dc-to-dc converter. Ideal diode bridges eliminate or reduce heat sinking requirements, which helps shrink the overall footprint and provides significant cost savings.
Product Selection Table
Latest Resources
Product Information
Product Selector Card
- Hot Swap Controllers PDF
- PowerPath Controllers, Ideal Diodes PDF
- Surge Stoppers PDF
- Ideal Diode Controllers PDF
- Ideal Diode Bridge PDF
- High Voltage Pushbutton Controllers PDF
- Micropower Hot Swap Controller PDF
- LT4321 - PoE Ideal Diode Bridge Controller PDF
LT Journal
- Dual Input, 42V, 2.5A Synchronous Buck Converter Features Seamless, Automatic Transition Between Two Input Power Sources and Meets Stringent CISPR 25 Class 5 EMI Limits PDF
- Low IQ Ideal Diode Controller with Reverse Input Protection for Automotive and Telecom Power Solutions PDF
- Avoid Debugging Cycles in Power Management for FPGA, GPU and ASIC Systems PDF
- Using a Current Sharing Controller when the Sum Current of Both Supplies is Required to Support the Load PDF
- Easy Balanced Load Sharing for Three or Four Supplies, Even with Unequal Supply Voltages PDF
- 2A_at_95%_Efficiency_from_Dual_Inputs_c3d5535d-9739-4d4a-a408-801a6609994d> 18V Buck-Boost Converter with Intelligent PowerPath Control Delivers >2A at 95% Efficiency from Dual Inputs PDF
- Ideal Diode Combines 200V Busses PDF
- Meet Green Standards in 24VAC and 12VAC Lighting Systems: Replace Halogen Bulbs with LEDs Driven by High Power Factor, High Efficiency Converter PDF
- Prioritize Power Sources in Any Order, Regardless of Relative Voltage: No µP Required PDF
- Ideal Diode and Hot Swap Controller Enables Supply Redundancy and Isolates Faults PDF
- Surge Stopper with Ideal Diode Protects Input and Output PDF
- Novel Current-Sharing IC Balances Two Supplies with Ease PDF
- Single-IC Supercapacitor-Based Power Supply Backup Solution PDF
- Dual Monolithic Ideal Diode Extends Battery Run Time and Prioritizes Power Sources with Glitch-Free Switchover PDF
- Negative Voltage Diode-OR Controller Tolerates Inputs to 300V and Beyond PDF
- June 2008 - Ideal Diode Betters a Schottky by a Factor of Four in Power and Space Consumption PDF
- September 2008 - 0V to 18V Ideal Diode Controller Saves Watts and Space over Schottky PDF
- June 2008 - Hot Swap Controller Enables Standard Power Supplies to Share Load PDF
- June 2003 - Combo Hot Swap/Load Share Controller Allows the Use of Standard Power Modules in Redundant Power Systems (by Vladimir Ostrerov and David Soo) PDF
- Mar 2008 - 9V to 80V Ideal Diode Reduces Heat Dissipation by Order of Magnitude over Schottky PDF
- Jun 2007 - A Cool Circuit: 48V Ideal Diode-OR Reduces Heat Dissipation PDF
- Sep 2006 Single Device Combines Pushbutton On/Off Control, Ideal Diode PowerPath and Accurate System Monitoring PDF
- August 2004 - Replace -48V ORing Diodes with FETs to Reduce Heat and Save Space PDF
- March 2005 - Dual Monolithic Ideal Diodes Provide a Single-Chip Power Management Solution PDF
Application Notes
Technical Articles
- Active Bridge Rectifiers Reduce Heat Dissipation within PoE Security Cameras
- Negative Voltage Ideal Diodes (Diode-OR Controllers)
- LTspice: Using Time-Dependent Exponential Sources to Model Transients
- Primer on PowerPath Controllers, Ideal Diodes & Prioritizers
- Powering Altera Arria 10 FPGA and Arria 10 SoC: Tested and Verified Power Management Solutions
- LT8672EMS Demo Board | VIN = -15V to 35V, Up to 5A Output
- High Efficiency Solar MPPT Battery Charger Using LT8611 and AD5245
- Using a Current Sharing Controller with Non-Redundant Supplies
- Meet Green Standards in 24VAC and 12VAC Lighting Systems: Replace Halogen Bulbs with LEDs Driven by High Power Factor, High Efficiency Converter
- The Dreaded "File Test" on an LT4320 Ideal Diode Bridge Controller
Videos
- MOSFET Failure Protection for Single Output PolyPhase® Converter
- LT4321/LT4275 TechClip - Increased Available PD Power
- LT4320 -Reducing AC/DC Rectifier Size and Cost with an LT4320 Ideal Diode Bridge
- LT4320 - Ideal Diode Bridge vs Schottky Diode Bridge
- Buck-Boost DC/DC Converter with Intelligent PowerPath
- Dual Input Prioritizers with Built-In Battery Monitoring
- LTC4370 Video Product Brief
- LT4320 File Test
- LT4320 Video Product Brief
- LT4321 Video Product Brief
- Active Rectifier Controller with Reverse Protection
- Prioritizers - Video Product Brief
- Surge Stoppers Video Product Brief
Design Notes
- DN572 - Active Rectifier Controller with Ultrafast Transient Response and Low Power Dissipation PDF
- DN549 - Powering Altera Arria 10 FPGA and Arria 10 SoC: Tested and Verified Power Management Solutions PDF
- DN1036 - Using a Current Sharing Controller with Non-Redundant Supplies PDF
- ™_Controller_Simplifi_es_Power_Management_8869a3bd-40c7-4f72-bcdf-26d5936f444f> DN160 - Dual PowerPath™ Controller Simplifi es Power Management PDF
- DN361 - Simple Battery Circuit Extends Power over Ethernet (PoE) Peak Current PDF
- DN386 - Ideal Diode Controller Eliminates Energy Wasting Diodes in Power OR-ing Applications PDF
- DN363 - Replace ORing Diodes with MOSFETs to Reduce Heat and Save Space PDF
- DN356 - Dual Monolithic Ideal Diode Manages Multiple Power Inputs PDF
- DN320 - New ICs Simplify Battery Charging from the USB PDF
- DN519 - Active Bridge Rectifiers Reduce Heat Dissipation within PoE Security Cameras PDF
- DN498 - Supercapacitor-Based Power Backup System Protects Volatile Data in Handhelds when Power Is Lost PDF
- DN487 - Supercapacitor-Based Power Backup Prevents Data Loss in RAID Systems PDF
- DN485 - Complete Energy Utilization Improves Run Time of a Supercap Ride-Through Application by 40% PDF
- DN450 - Supercapacitors Can Replace a Backup Battery for Power Ride-Through Applications PDF
- DN444 - Ideal Diodes Protect Against Power Supply Wiring Errors PDF
- DN1012 - Shrink Solar Panel Size by Increasing Performance PDF
- DN1003 - Ideal Diode Controller Eliminates Energy Wasting Diodes in Power OR-ing Applications PDF
Ideal Diode Bridge
SortOrder | Part# | Number of Outputs | Output Current Range | Vin (min) (V) | Vin (max) (V) | Isupply (typ) (A) | Frequency Range | Ideal Diode | US Price 1000 to 4999 ($ US) |
---|---|---|---|---|---|---|---|---|---|
1 | LT4321 | 2 | 0.1A to 100A | 20 | 80 | 500µ | DC | Dual Bridges with External N-Channel | $2.95 (LT4321IUF#PBF) |
2 | LT4320-1 | 1 | 0.1A to 100A | 9 | 72 | 1.5m | DC to 600Hz | Single Bridge with External N-Channel | $3.25 (LT4320IMSE-1#PBF) |
3 | LT4320 | 1 | 0.1A to 100A | 9 | 72 | 1.5m | DC to 60Hz | Single Bridge with External N-Channel | $2.95 (LT4320IMSE#PBF) |