Rochester Electronics PMIC - AC DC Converters, Offline Switchers UCC3809N-2

The UCC3809N-2 is a member of the UCC3809 family of BCDMOS low power integrated circuits designed for offline and isolated DC-to-DC fixed frequency current mode switching power supplies. It features user-programmable soft start, maximum duty cycle, and operates at frequencies up to 1 MHz. The device includes undervoltage lockout (UVLO) with specific thresholds for startup and shutdown, ensuring reliable operation in various conditions. The output stage can source up to 0.4A and sink up to 0.8A, making it suitable for driving N-channel MOSFETs. The UCC3809N-2 is available in multiple package options, including SOIC, PDIP, TSSOP, and MSOP, which are advantageous for applications with limited board space. The device is characterized by a low startup current of 100µA and includes an accessible 5V reference output. It is designed to minimize external component count while providing essential control and drive circuitry for efficient power management.