FAN49103AUC340X

Fairchild FAN49103 TinyPower I�C 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. The 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 I�C interface to program the operation mode and output voltage of the regulator. With light and moderate loads, the Pulse Frequency Modulation (PFM) runs the regulator in power-save mode to maintain high efficiency. When in PFM mode, the device offers excellent transient response during load steps. With moderate to heavier loads or forced PWM mode, the regulator switches to the PWM fixed-frequency control. When in PWM mode, the FAN49103 operates at 1.8MHz nominal fixed frequency to allow for reduced external component values.