Features and Benefits
- Reduces Power Dissipation by Replacing a Power Schottky Diode with No External Components
- Internal 7A, 21mΩ N-Channel MOSFET
- 15mV Regulated Forward Voltage
- 20μA Operating Current, 0.8μA Shutdown
- Wide 0V to 40V Input Range with VCC > 2.75V
- Fast Turn-On Minimizes Voltage Droop
- Fast Reverse Recovery Time Minimizes Reverse Transient Current
- Smooth Switchover in Diode-OR Applications
- 16-Lead 2mm × 3mm LQFN Package
The LTC4451 is a high-performance Schottky diode replacement using an integrated N-Channel power MOSFET. It easily ORs power supplies together to increase system reliability and prevent reverse conduction.
The LTC4451 regulates the forward voltage at 15mV to minimize power loss compared to Schottky diodes. Regulation ensures smooth current transfer without oscillation in diode-OR applications. When the power MOSFET is fully enhanced, the RDS(ON) of the transistor is 21mΩ and rated for forward conduction up to 7A while dissipating 1.34W. A high performance gate driver with fast transient response minimizes both forward power dissipation and reverse current. The VCC input allows VIN to work down to ground for low voltage applications. The LTC4451 is available in a small 16-Lead 2mm × 3mm LQFN Package.
- Schottky Diode Replacement
- Industrial, Medical and Consumer Portable Devices
- Battery and Wall Adapter Diode ORing
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Demonstration Circuit 3001A-B showcases the LTC4451 ideal diode controller with an integrated low RDS(ON) MOSFET. The board includes two independent LTC4451 ideal diodes sharing a common ground and operates over a range of 0V to 40V, carrying up to 8A at 25°C ambient temperature. The board can be set up in a diode-OR configuration by connecting the output channels together.
NOTE: Although the DC3001A-B can carry 8A at 25°C, the LTC4451 is designed for a max current of 7A across –40°C to 125°C. Please follow the data sheet recommendations to design your application across the operating temperature range.
Tools & Simulations
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Models for the following parts are available in LTspice:
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.
Sample & Buy
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Pricing displayed is based on 1-piece.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.