UC3844B SMD IC SOIC-8 DC-DC Controller

From the shop's description

Specifications Attribute Value Maximum Switching Frequency 500 kHz Output Current 1 A Control Method Current Number of Outputs 1 Mounting Type Surface Mount Fall Time 50 ns Package Type SOIC Rise Time 50 ns Topology Boost, Flyback Pin Count 8 Maximum Duty Cycle 48 % Length 5 mm PWM Controller Type Current Mode Minimum Operating Temperature 0 °C Maximum Operating Temperature +70 °C UC3844B Datasheet