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VA7920 fiches techniques PDF

Vimicro - HIGH EFFICIENCY DC-DC STEP UP CONVERT

Numéro de référence VA7920
Description HIGH EFFICIENCY DC-DC STEP UP CONVERT
Fabricant Vimicro 
Logo Vimicro 





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VA7920 fiche technique
VA7910/VA7920
REV 1.1/Feb 2006
HIGH EFFICIENCY DC-DC STEP UP CONVERT
FEATURES
„ 0.9V start up voltage;
„ 0.9V minimum operating voltage;
„ Above 95% efficiency;
„ Low battery voltage detector;
„ Fixed 3.3V and 5V output or adjustable
output from 2V to 5V;
„ Internal synchronous rectifier;
„ Zero shut down current;
„ Little external elements
„ Ultra small TSSOP8, MSOP8 package;
APPLICATION
„ One to three-cell battery powered devices;
„ PDA and handheld instruments;
„ Cell phones;
„ Pagers;
„ GPS
„ Digital cameras;
INTRODUCTION
VA7910/VA7920 series circuits are high
efficiency DC-DC step up converts, with a few
external components to realize the conversion
from the battery voltage to the expect output
voltage. It can be widely used in PDA cell
phoneshand-held devices and so on.
The start up voltage is guaranteed at above
0.9V input and the device keeps working.
With an internal synchronous P-MOS rectifier,
it doesn’t require external diode to rectify.
VA7910FF is completely compatible with
L6920 of ST Corporation. And VA7910DF is
completely compatible with MAX1674/MAX1675
of MAXIM Corporaton.
FUNCTIONAL DIAGRAM
FB
VREF
Zero crossing
comparator
-
Multi-way
selector
+ -+
Voltage
com parator
-
Logic
controller
+
Reference
Voltage
comparator
LBI
Current
limit
circuit
LBO
SHDN
Fig1 Function Diagram
OUT
LX
GND
www.vimicro.com
© 2003 Vimicro Corporation
-1-
DSC-VA7910/VA7920 -1

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