L6920DBTR STMicroelectronics

L6920DB Synchronous rectifier step up converter General features 0.8V start up input voltage Up to 5.5V operating input voltage Internal synchronous rectifier MSOP8 Adjustable output voltage from 1.8V 3.3V and 5V fixed output voltages Description Low battery voltage detection Reverse battery protection The L6920DB is a high efficiency monolithic step up switching converter IC especially designed for 750mA input current limit battery powered application. Switching frequency up to 1MHz Package is MSOP8 in order to minimize PCB 1.23V reference voltage available space. It requires only three external components to realize the conversion from the battery voltage Applications to the selected output voltage. Conversion from 1 to 3 alkaline, The minimum output voltage is 1.8V: suitable to supply the most advanced ASIC and P. NiMH, NiCd battery cells or 1 lithium ION PDA and handheld instruments High switching frequency allows for a low profile, small sized inductor and output capacitor to be Digital cameras used. Cellular phones Reference voltage, low battery detection and GPS Shutdown are provided together with over current. Distributed power Application circuit L6920DB 3.3V October 2006 Rev 5 1/16 www.st.com 16Contents L6920DB Contents 1 Pin settings 3 1.1 Pin connection 3 1.2 Pin description 3 2 Electrical data 4 2.1 Maximum ratings 4 2.2 Thermal data . 4 3 Electrical characteristics . 5 4 Typical performance . 6 5 Detailed description . 7 5.1 Principle of operation . 7 5.2 Start-up . 9 5.3 Shutdown . 10 5.4 Low battery detection 10 5.5 Low battery input . 10 5.6 Reverse polarity 10 5.7 Output voltage selection 10 6 Package mechanical data 12 7 Order code 14 8 Revision history . 15 2/16