Texas Instruments UC3902 Load Share Controller UC3902DG4

The UC3902DG4 is an 8-pin load share controller designed to balance the current drawn from multiple paralleled power supplies. It operates within a voltage range of 2.7 V to 20 V and requires a minimal number of external components, making it suitable for integration into existing power supply designs that utilize remote output voltage sensing. This device features a differential share bus that enhances noise immunity and allows for the adjustment of each power supply's output current based on the voltage on the share bus. The UC3902 includes a precision current sense amplifier with a gain of 40, as well as undervoltage lockout (UVLO) circuitry. It also allows for user-programmable share loop compensation, enabling flexibility in load sharing configurations. The UC3902 is capable of supporting power supplies with different output current capabilities, ensuring that each supply contributes proportionally to the overall load. It is important to note that the device has limited built-in ESD protection, necessitating careful handling to prevent electrostatic damage. The operating temperature range is from -40¬8C to 105¬8C, making it suitable for a variety of applications.