CAT660

Preliminary Information CAT660 100mA CMOS Charge Pump Inverter/Doubler FEATURES I Replaces MAX660 and LTC®660 I Converts V+ to V- or V+ to 2V+ I Low output resistance, 4Ω typical I High power efficiency I Selectable charge pump frequency I Low quiescent current H GEN FR ALO EE LE A D F R E ETM I Pin-compatible, high-current alternative to 7660/1044 I Industrial temperature range I Available in 8-pin SOIC, DIP and 0.8mm thin 8- - 10kHz or 80kHz - Optimize capacitor size pad TDFN packages - Lead-free, halogen-free package option APPLICATIONS I Negative voltage generator I Voltage doubler I Voltage splitter I Low EMI power source I GaAs FET biasing I Lithium battery power supply I Instrumentation I LCD contrast bias I Cellular phones, pagers DESCRIPTION The CAT660 is a charge-pump voltage converter. It will invert a 1.5V to 5.5V input to a -1.5V to -5.5V output. Only two external capacitors are needed. With a guaranteed 100mA output current capability, the CAT660 can replace a switching regulator and its inductor. Lower EMI is achieved due to the absence of an inductor. In addition, the CAT660 can double a voltage supplied from a battery or power supply. Inputs from 2.5V to 5.5V will yield a doubled, 5V to 11V output voltage. A Frequency Control pin (BOOST/FC) is provided to select either a high (80kHz) or low (10kHz) internal oscillator frequency, thus allowing quiescent current vs. capacitor size trade-offs to be made. The 80kHz frequency is selected when the FC pi...