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Overview
| Topology | Other Topology |
| Switching frequency | 50-100 kHz |
| IC revision | 1.0 |
Description
The LT®8672 is an active rectifier controller for reverse input protection. It drives an external N-channel MOSFET to replace a power Schottky diode. Its very low quiescent current and fast transient response meet the tough requirements in automotive applications where AC input signals of up to 100kHz are present. These signals are rectified with minimum power dissipation on the external FET, simplifying thermal management on the PCB. With a drop of only 20mV, the LT8672 solution eases the minimum input voltage requirement during cold crank and start-stop, allowing simpler and more efficient circuits. If the input power source fails or is shorted, a fast turn-off minimizes reverse current transients. An available shutdown mode reduces the quiescent current to 3.5μA. An integrated auxiliary boost regulator provides the required boost voltage to turn the external FET fully on. A power good pin signals when the external FET is ready to take load current.
Features
- AEC-Q100 Qualified for Automotive Applications
- Reverse Input Protection to –40V
- Improved Performance Compared to a Schottky Diode
- Reduce Power Dissipation by >90%
- Reduce Drop to 20mV n Ultrafast Transient Response
- Rectifies 6VP-P Up to 50kHz n Rectifies 2VP-P Up to 100kHz - Wide Operating Voltage Range: 3V to 42V
- Low 20µA Quiescent Current in Operation
- Low 3.5µA Shutdown Current n Accurate 1.21V Enable Pin Threshold n Small 10-Lead MSOP Package, 10-Lead 3mm × 2mm DFN Package and 3mm × 2mm Side-Wettable DFN Package
Typical applications
- Automotive Battery Protection
- Portable Instrumentation
- Industrial Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | λDom typ.(nm) | Emitting Color | λPeak typ.(nm) | IV typ.(mcd) | VF typ.(V) | Chip Technology | 2θ50% typ.(°) | L(µH) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | fres(MHz) | VOP(V) | Mount | ISAT(A) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(Ω) | Type | IR(mA) | Z @ 1 GHz(Ω) | H(mm) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WL-SMCW SMT Mono-color Chip LED Waterclear, 525 nm, Green | Downloads27 files RAY files
| Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | Dominant Wavelength [typ.]525 nm | Emitting ColorGreen | Peak Wavelength [typ.]515 nm | Luminous Intensity [typ.]430 mcd | Forward Voltage [typ.]3.2 V | Chip TechnologyInGaN | Viewing Angle Phi 0° [typ.]140 ° | – | – | – | – | – | – | MountSMT | – | – | – | – | – | – | – | – | – | Height0.7 mm | |||
| WL-SMCW SMT Mono-color Chip LED Waterclear, 590 nm, Yellow | Downloads27 files RAY files
| Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear | Dominant Wavelength [typ.]590 nm | Emitting ColorYellow | Peak Wavelength [typ.]595 nm | Luminous Intensity [typ.]120 mcd | Forward Voltage [typ.]2 V | Chip TechnologyAlInGaP | Viewing Angle Phi 0° [typ.]140 ° | – | – | – | – | – | – | MountSMT | – | – | – | – | – | – | – | – | – | Height0.7 mm | |||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | – | – | – | – | – | MountSMT | – | Impedance @ 100 MHz15 Ω | Maximum Impedance60 Ω | Maximum Impedance1000 MHz | Rated Current 21900 mA | DC Resistance0.1 Ω | TypeHigh Speed | Rated Current500 mA | Impedance @ 1 GHz56 Ω | Height0.8 mm | ||||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | – | – | – | – | – | MountSMT | – | Impedance @ 100 MHz600 Ω | Maximum Impedance700 Ω | Maximum Impedance150 MHz | Rated Current 22000 mA | DC Resistance0.15 Ω | TypeHigh Current | Rated Current1500 mA | Impedance @ 1 GHz193 Ω | Height0.0009 mm | ||||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | – | – | – | – | – | MountSMT | – | Impedance @ 100 MHz600 Ω | Maximum Impedance650 Ω | Maximum Impedance80 MHz | Rated Current 22500 mA | DC Resistance0.07 Ω | TypeHigh Current | Rated Current1500 mA | Impedance @ 1 GHz79 Ω | Height1.1 mm | ||||
 | WE-MPSB EMI Multilayer Power Suppression Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSB EMI Multilayer Power Suppression Bead | – | – | – | – | – | – | – | – | – | – | DC Resistance1 mΩ | – | – | MountSMT | – | Impedance @ 100 MHz10 Ω | Maximum Impedance41 Ω | Maximum Impedance2178 MHz | Rated Current 210500 mA | DC Resistance0.003 Ω | TypeHigh Current | Rated Current10500 mA | Impedance @ 1 GHz28 Ω | Height1.1 mm | ||||
| WE-MPSB EMI Multilayer Power Suppression Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSB EMI Multilayer Power Suppression Bead | – | – | – | – | – | – | – | – | – | – | DC Resistance2.5 mΩ | – | – | MountSMT | – | Impedance @ 100 MHz56 Ω | Maximum Impedance90 Ω | Maximum Impedance1000 MHz | Rated Current 210000 mA | DC Resistance0.004 Ω | TypeHigh Current | Rated Current10000 mA | Impedance @ 1 GHz90 Ω | Height2.28 mm | ||||
 | WE-TPC SMT Tiny Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | – | – | – | – | – | – | – | Inductance2.2 µH | – | – | DC Resistance125 mΩ | Self Resonant Frequency100 MHz | – | MountSMT | Saturation Current1 A | – | – | – | – | DC Resistance0.155 Ω | – | Rated Current1300 mA | – | Height1.1 mm | ||||
 | WE-MAPI SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | – | – | – | – | – | – | – | Inductance0.33 µH | Performance Rated Current8.7 A | Saturation Current @ 30%10.5 A | DC Resistance14 mΩ | Self Resonant Frequency140 MHz | Operating Voltage80 V | MountSMT | Saturation Current8.3 A | – | – | – | – | DC Resistance0.017 Ω | – | Rated Current5500 mA | – | Height2 mm | ||||
| WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Impedance @ 100 MHz48 Ω | Maximum Impedance90 Ω | Maximum Impedance600 MHz | Rated Current 26000 mA | DC Resistance0.005 Ω | TypeHigh Current | Rated Current4000 mA | – | Height1.1 mm |