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■ GENERAL DESCRIPTION

The XC9110/9111 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 2.5Ω N-channel driver transistor, the XC9110A/C/E and XC9111A/C/E types provide a step-up operation by using only a coil, a capacitor, and a diode connected externally.

The XC9110/9111B, D and F versions can be used with an external transistor for applications requiring larger currents.

■ FEATURES

Operating (Input) Voltage Range : 0.9V ~ 10.0V

Output Voltage Range : 1.5V~7.0V (100mV increments, accuracy ± 2.5)

Maximum Oscillation Frequency : 100kHz (accuracy ± 15) 180kHz (for the XC9111 series, duty ratio: 56 at light loads)

Built-in Switching N-ch Transistor : A/C/E type ON Resistance 2.5Ω (VDD=3.0V)

External Transistor Types : B/D/F type

Lx Limit Voltage : E type: more than VDD=2.0V : A/C type: more than VOUT=2.0V

Low Supply Current : 2.0μ A (When operating, VOUT=3V)

Small Package : SOT-23 & SOT89 (for XC9111 series), SOT-25, USP-6C

■ APPLICATIONS

● Mobile phones

● Various palm top equipment

● Cameras, VCRs

● Various portable equipment