LT4322
RECOMMENDED FOR NEW DESIGNSFloating, High-Voltage Active Rectifier Controller
- Part Models
- 4
- 1ku List Price
- Starting From $2.04
Overview
- Replaces Rectifying Diodes with N-Channel MOSFETs in Rectifier Applications
- Maximizes Power Efficiency, Eliminates Thermal Design Problems
- Low 25mV Forward Voltage Drop
- Wide Operating Voltage Range: 9V to >500V
- Wide Operating Frequency Range: DC to 100kHz
- Regulated 12V GATE Drive for External N-Channel MOSFET Enhancement
- 8-Lead MSOP and 8-Lead, 3mm x 3mm, Side Wettable DFN Packages
The LT4322 is a floating active rectifier controller that drives an external N-Channel MOSFET to replace a rectifier diode. It is designed primarily for AC applications and operates with input supply frequencies ranging from DC to 100kHz. On each cycle of the input AC waveform, an external N-Channel MOSFET gate is enhanced to provide the equivalent of a low diode forward voltage drop of 25mV. The resulting reduction in power dissipation eliminates thermal design problems and costly heat sinks, greatly reducing PC board area.
The addition of a high-voltage depletion N-Channel MOSFET enables operation at very high output voltages, limited only by the voltage ratings of two external MOSFETs. In AC applications, an integrated LDO provides the required gate drive voltage to turn the external MOSFET fully on. Fast, high-current gate drivers minimize reverse current transients at high input frequencies.
APPLICATIONS
- Single-Phase, 3-Phase, and 6-Phase Bridge Rectifiers
- Automotive Alternator Bridge Rectifiers
- Off-Line Active Bridge Rectifier
- 3-Phase Aircraft Power
- High-Voltage DC Diode-OR with Reverse Blocking
Documentation
Data Sheet 1
User Guide 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT4322RDDM#PBF | 8-lead Side Wettable DFN (3 mm x 3 mm x 0.75 mm) | ||
| LT4322RDDM#TRPBF | 8-lead Side Wettable DFN (3 mm x 3 mm x 0.75 mm) | ||
| LT4322RMS8#PBF | 8-Lead MSOP | ||
| LT4322RMS8#TRPBF | 8-Lead MSOP |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LT4322
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.