FEATURES Replaces MAX660 and LTC®660 Converts V+ to V- or V+ to 2V+ Low output resistance, 4Ω typical High power efficiency Selectable charge pump frequency - 10kHz or 80kHz - Optimize capacitor size Low quiescent current Pin-compatible, high-current alternative to 7660/1044 Industrial temperature range Available in 8-pin SOIC and DIP packages - Lead-free, halogen-free package option
APPLICATIONS Negative voltage generator Voltage doubler Voltage splitter Low EMI power source GaAs FET biasing Lithium battery power supply Instrumentation LCD contrast bias 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 pin is connected to V+. The operating frequency can also be adjusted with an external capacitor at the OSC pin or by driving OSC with an external clock. Both 8-pin DIP and SOIC packages are available in the industrial temperature range. The CAT660 replaces the MAX660 and the LTC?660. In addition, the CAT660 is pin compatible with the 7660/1044, offering an easy upgrade for applications with 100mA loads.
