L6920DB
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
■
3.3V and 5V fixed output voltages
■
Low battery voltage detection
Description
■
Reverse battery protection
■
750mA input current limit
■
Switching frequency up to 1MHz
The L6920DB is a high efficiency monolithic step
up switching converter IC especially designed for
battery powered application.
■
1.23V reference voltage available
Applications
■
Conversion from 1 to 3 alkaline,
■
NiMH, NiCd battery cells or 1 lithium ION
■
PDA and handheld instruments
■
Digital cameras
■
Cellular phones
■
GPS
■
MSOP8
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.
Distributed power
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.
Application circuit
L6920DB
October 2006
Rev 5
3.3V
1/16
www.st.com
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