XC9105

The XC9103/9104/9105 series XC9105 are PWM, PWM/PFM auto switching /manual switching controlled multi-functional step-up DC/DC converter controllers.

XC9105 Output will be stable no matter which load capacitors are used but should a low ESR capacitor be used, RSENSE of about 0.1Ω will be required and phase compensation will be achieved. This makes the use of ceramic capacitors much easier and allows for lower output ripple and reduced PCB area requirements. Tantalum and electrolytic capacitors can also be used, in which case, RSENSE becomes unnecessary.

With 0.9V of standard voltage supply internal, and using externally connected components, output voltage can be set up freely within a range of 1.5V to 30V. With 300kHz or 180kHz frequencies, the size of the external components can be reduced. Oscillation frequencies of 100kHz and 500kHz are also available as custom-designed products. The XC9103 series are PWM controlled. Control switches from PWM to PFM during light loads with the XC9104 and the series is highly efficient from light loads to large output currents. By using external signals, control of the XC9105 can be alternated between PWM and PWM/PFM automatic switching and so, control suited to the application can be selected.

A current limiter circuit is built in to the IC XC9105 (except with the 100kHz and 500kHz version) and monitors the ripple voltage on the FB pin. Operation is shut down when the ripple voltage is more than 250mV(180kHz version). The operations of the IC XC9105 can be returned to normal with a toggle of the CE pin or by turning the power supply back on.