DC/DC Converter ICs
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 suitable 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 XC9110C/E and XC9111C/E types provide a step-up operation by using only a coil, a capacitor, and a diode connected externally. The XC9110/9111D and F versions can be used with an external transistor for applications requiring larger currents. Output voltage is internally programmable in a range from 1.5 to 7.0 V in increments of 100 mV (accuracy: ۬.5%). Maximum oscillation frequency is set to 100 kHz for XC9110/9111series. Options include a CE pin (C and D versions) that allows the IC to be shut down thereby reducing supply current and 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% making it suitable for use with large current operations. The XC9111 series automatically switches duty ratio between 55% & 75% when it senses changes in load and can support both large and small currents.
Torex Semiconductor Europe
Torex Semiconductor Europe Ltd.
Unit 1 The Courtyard, Whitwick Business Park, Stenson Rd.
Coalville, Leicestershire
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