UC3902NG4 Datasheet

Power Management Specialized


The UC3902( UC3902NG4 ) load share controller is an 8-pin device that balances the current drawn from independent, paralleled power supplies. Load sharing is accomplished by adjusting each supplies’ output current to a level proportional to the voltage on a share bus. The master power supply, which is automatically designated as the supply that regulates to the highest voltage, drives the share bus with a voltage proportional to its output current. The UC3902 trims the output voltage of the other paralleled supplies so that they each support their share of the load current. Typically, each supply is designed for the same current level although that is not necessary for use with the UC3902. By appropriately scaling the current sense resistor, supplies with different output current capability can be paralleled with each supply providing the same percentage of their output current capability for a particular load. UC3902NG4 Features • 2.7-V to 20-V Operation• 8-Pin Package• Requires Minimum Number of External Components• Compatible with Existing Power Supply Designs Incorporating Remote Output Voltage Sensin• Differential Share Bus• Precision Current Sense Amplifier (40 Gain)• UVLO (Undervoltage Lockout) Circuitry• User Programmable Share Loop Compensation UC3902NG4 Applications • Paralelled Power Supplies


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Manufacturer information


Diodes Incorporated is a leading global manufacturer and supplier of high-quality, application-specific, standard products within the broad discrete, logic and analog semiconductor markets. Diodes Incorporated primarily serves the computing, consumer, communications, industrial and automotive segments. Diodes’ diverse product portfolio includes parts for LCD/LED TVs and displays, desktop, notebook and tablet computing, smartphones and hand-held devices, set-top boxes, power supplies and USB protection as well as many other application areas.

Diodes Incorporated offers a wide array of products including diodes, rectifiers, transistors, MOSFETs, gate drivers, protection devices, function-specific arrays, amplifiers and comparators, Hall-effect sensors and temperature sensors, power management devices including LED drivers, AC-DC converters and controllers, DC-DC switching regulators, linear voltage regulators, current monitors, and voltage reference and shunt regulators, along with special function devices including USB power switches, load switch devices, voltage supervisors and motor controllers.

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