FAN49103 TinyPower I2C Buck-Boost Regulator onsemi FAN49103 TinyPower I2C Buck-Boost Regulator is designed as a high-efficiency, buck-boost, switching-mode regulator that accepts input voltages above or below the regulated output voltage. onsemi FAN49103 regulator uses full-bridge architecture with synchronous rectification and delivers up to 2.5A while regulating the output at 3.4V. The device provides a seamless transition between step-up and step-down modes to reduce output disturbances. Designers can use the I2C interface to program the operation mode and output voltage of the regulator.