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Numéro de référence | VA7910 | ||
Description | HIGH EFFICIENCY DC-DC STEP UP CONVERT | ||
Fabricant | Vimicro | ||
Logo | |||
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
phones、hand-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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Pages | Pages 9 | ||
Télécharger | [ VA7910 ] |
No | Description détaillée | Fabricant |
VA7910 | HIGH EFFICIENCY DC-DC STEP UP CONVERT | Vimicro |
US18650VTC5A | Lithium-Ion Battery | Sony |
TSPC106 | PCI Bus Bridge Memory Controller | ATMEL |
TP9380 | NPN SILICON RF POWER TRANSISTOR | Advanced Semiconductor |
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