L6920DC

L6920DC Synchronous rectifier step up converter General features ■ ■ ■ ■ 0.8V start up input voltage Up to 5.5V operating input voltage Internal synchronous rectifier Adjustable output voltage from 1.8V to 5.5V fixed output voltages Low battery voltage detection Reverse battery protection 550mA minimum input current limit Switching frequency up to 1MHz 1.23V reference voltage available MSOP8 www.DataSheet4U.com ■ 3.3V and 5V ■ ■ ■ ■ ■ Description The L6920DC is a high efficiency monolithic step up switching converter IC especially designed for battery powered application. Package is MSOP8 in order to minimize PCB space. It requires only three external components to realize the conversion from the battery voltage to the selected output voltage. The minimum output voltage is 1.8V: suitable to supply the most advanced ASIC and µP. High switching frequency allows for a low profile, small sized inductor and output capacitor to be used. Reference voltage, low battery detection and Shutdown are provided together with over current, over voltage. Applications ■ ■ ■ ■ ■ ■ ■ Conversion from 1 to 3 alkaline, NiMH, NiCd battery cells or 1 lithium ION PDA and handheld instruments Digital cameras Cellular phones GPS Distributed power Application circuit L6920DC 3.3V June 2006 Rev 1 1/16 www.st.com 16 Contents L6920DC Contents 1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 1.2 Pin connection . . . . . . . . ....