LTC4451 Datasheet

• 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 V_CC > 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

• Schottky Diode Replacement
• Industrial, Medical and Consumer Portable Devices
• Battery and Wall Adapter Diode ORing

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 R_DS(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 V_CC input allows V_IN to work down to ground for low voltage applications. The LTC4451 is available in a small 16-Lead 2mm × 3mm LQFN Package.