AIC1650

The AIC1650 is a high performance inverting DC/DC controller, designed to drive an external power switch to generate programmable nega-tive voltages. In the particularly suitable LCD bias contrast application, maximum efficiency of 90% can be achieved with low cost PNP bipolar transistor drivers. 4V to 20V input operation range allows the AIC1650 to be powered di-rectly by the battery pack in most battery-operated applications for greater efficiency. Output voltage can be scaled to -40V or greater by two external resistors. A pulse frequency modulation scheme is employed to maintain high efficiency conversion under wide input voltage range. Quiescent current is about 100mA and can be reduced to 8uA in shutdown mode. Switching frequency being around 100KHz to 320KHz range, small size switching components are ideal for battery powered port-able equipments, like notebook and palmtop computers.