XC9110 Series

PFM Controlled Step-Up DC/DC Converter / Controller Ics

The XC9110 series is a group of PFM controlled step-up DC/DC converter/controller ICs designed to generate low supply voltage by the combination of PFM control and CMOS structure. The series is ideal for applications where a longer battery life is needed such as in portable communication equipment. With a built-in 2.5ΩN-channel driver transistor, the XC9110C/E types provide a step-up operation by using only a coil, a capacitor, and a diode connected externally.

The XC9110B, D and F versions can be used with an external transistor for applications requiring larger currents.

Output voltage is internally programmable in a range from 1.5V to 7.0V in increments of 0.1V (±2.5%).

Maximum oscillation frequency is set to 100kHz for XC9110 series. Options include products equipped with a CE pin (C and D versions) that allows the IC to be shut down thereby reducing quiescent current and with separated VDD/VOUT pins (E and F versions) to separate the power supply block and the output voltage detect block. With the XC9110 series, maximum duty cycle is set to 75% (VDD=3.3V) making it suitable for use with large current operations.

Typical Application Circuit


Operating (Input) Voltage Range 0.9V~10.0V
Output Voltage Range 1.5V~7.0V(0.1V increments) (Accuracy ±2.5%)
MaximumOscillation Frequency 100kHz(±15%),180kHz (for the XC9111 series,duty ratio:56% at light loads)
Built-in Switching Transistor Types A/C/E
On Resistance 2.5Ω(VDD=3.0V)
External Transistor Types Types B/D/F
Lx Limit Voltage Type E : More than VDD=2.0V
Types A/C : More than VOUT=2.0V



Quality Reports


QuestionWhat is the standby current?

The current that flows through the IC in the standby mode. The standby mode means the state where the IC has been turned off by the CE function.

QuestionWhat does the FB product mean?

An IC for which any output voltage can be set by the reference voltage of the FB pins and the external dividing resistor. The output voltage is determined by the RFB1 and RFB2 values, using the following formula: VOUT = Vref × (RFB1 + RFB2)/RFB2