LT4322RMS8#PBF

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. Application includes 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.

• Replaces rectifying diodes with N-channel MOSFETs in rectifier applications
• Maximizes power efficiency, eliminates thermal design problems
• Wide operating voltage range from 9V to <gt/>500V
• Wide operating frequency range from DC to 100KHz
• Regulated 12V GATE drive for external N-Channel MOSFET enhancement
• Input supply undervoltage lockout is 4.4V (typ, VDDC Rising; measured at VDDA)
• Drop-out voltage, (VDDC – VDDA) is 120mV (typ, VDDC = CATHODE = 11V)
• CATHODE input bias current is -3µA (typ, forward bias, CATHODE = -25mV)
• GATE drive output low voltage is 5mV (typ, CATHODE = 12V, IGATE = 1mA)
• 8 lead plastic MSOP package, temperature range from -40°C to 150°C

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