UM3433 Datasheet | Union Semiconductor

Description The UM3433 is synchronous rectified, fixed frequency, step-up DC/DC converter series delivering high efficiency in a low profile SOT23-6 package. It is available both in 3.3V/3.0V fixed output and adjustable output. With an internal NMOS switch and PMOS synchronous rectifier and high switching frequency of 600KHz, the UM3433 is capable of supplying 3.3V output at 100m A from a single AA cell input using low profile inductors and ceramic capacitors. Current mode PWM control with internal pensation cuts external parts count thereby saving BOM cost and PCB real estate. At light loads, UM3433 enters automatically into power saving mode to keep high efficiency at light load. Anti-ringing control circuitry inside reduces EMI interferences by damping the inductor in discontinuous mode. The device also features low shutdown current of under 1 μA. With inrush current limiting and soft start built inside, it...