The XC9301/02 series are step-up/down DC/DC converter controller ICs with fast, low ON resistance drivers built-in. A versatile, large output current, step-up/down DC/DC converter can be realised using only 4 basic external components - transistors, coils, diodes and capacitors. Output voltage is selectable in 0.1V steps within a 2.4V ~ 6.0V ( 2.5% accuracy) range and switching frequency is set at 180kHz or 300KHz. The XC9302 series switches from PWM to PFM control during light loads and the series offers high efficiencies from light loads through to large output currents.