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12V Distribution in μTCA Redundant Power Subsystem 24V Overvoltage Regulator Withstands 150V at VIN 28V Vehicle Application with Reverse Voltage Protection 4A, 12V Overvoltage Output Regulator 5V System Protected from ± 24V Power Supplies 5V System Protected from ±24V Power Supplies and Overcurrent 5V System Protected From 80V Overvoltage Complete 12V Automotive Undervoltage, Overvoltage and Reverse-Supply Protection Circuit Dual Battery Load Sharing with Automatic Switchover of Power from Batteries to Wall Adapter Dual Battery Load Sharing with Automatic Switchover to a Wall Adapter Dual Battery Load Sharing with Automatic Switchover to a Wall Adapter Half Bridge Motor Driver Overvoltage Regulator with 250V Surge Protection Overvoltage Regulator with Low Battery Detection and Output Keep Alive During Shutdown Peak Power Tracking Buck Solar Charger Maximizes Efficiency Power Backup Using Supercapacitors and Optional Keep-Alive Cell Protected 1A Automotive Solenoid Driver with Overvoltage Shutdown Protection from Overvoltage and Overcurrent Protection of USB Port from Overvoltage and Overcurrent SCR Crowbar Solar Panel Charging 12V Battery Through Ideal Diode to Prevent Back Feeding Supercap-Based Power Ride-Through Circuit Maximizes Run Time Using an Energy Scavenging Scheme Supercapacitor Energy Storage System for Data Backup Two Load-Sharing, Redundant, 48V/10A Power Supplies Using an Ideal Diode μTCA Application Supplying 12V Power to Two μTCA Slots
In solar power systems, Schottky diodes are used to prevent discharge of the battery during hours of darkness. Unfortunately, the voltage drop and power dissipation of a Schottky diode can be quite large when used with high wattage solar panels, thus reducing the amount of power available to charge the battery. This circuit uses the LTC4357 with a FDB3632 MOSFET to replace the Schottky diode. When the solar panel is illuminated by full sunlight, it charges the battery. A shunt regulator absorbs any excess charging current to prevent overcharging. If the forward current is greater than 25mV/RDS(ON), the MOSFET is fully enhanced and the voltage drop rises according to RDS(ON) • (I BATTERY + I LOAD). In darkness, or in the event of a short circuit across the solar panel or a component failure in the shunt regulator, the output voltage of the solar panel will be less than the battery voltage. In this case, the LTC4357 shuts off the MOSFET, so the battery will not discharge. The current drawn from the battery into the LTC4357’s OUT pin is only 7μA at 12V.