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LM3350MMX Datasheet

  • LM3350MMX

  • Switched Capacitor Voltage Converter

  • 8頁(yè)

  • NSC

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LM3350 Switched Capacitor Voltage Converter
December 1999
LM3350
Switched Capacitor Voltage Converter
General Description
The LM3350 is a CMOS charge-pump voltage converter
which efficiently provides a 3.3V to 5V step-up, or 5V to 3.3V
step-down. The LM3350 uses four small, low cost capacitors
to provide the voltage conversion. It eliminates the cost, size
and radiated EMI related to inductor based circuits, or the
power loss of a linear regulator. Operating power conversion
efficiency greater than 90% provides ideal performance for
battery powered portable systems.
The architecture provides a fixed voltage conversion ratio of
3/2 or 2/3. Thus it can be used for other DC-DC conversions
as well.
n
n
n
n
4.2鈩?typical step-up output impedance
1.8鈩?typical step-down output impedance
90% typical power conversion efficiency at 50 mA
250 nA typical shutdown current
Features
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Conversion of 3.3V to 5V, or 5V to 3.3V
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Small Mini SO-8 package
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No inductor required
Applications
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Any mixed 5V and 3.3V system
Laptop computers and PDAs
Handheld instrumentation
PCMCIA cards
Key Specifications
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800 kHz switch frequency allows use of very small,
inexpensive capacitors.
Ordering Information
Order Number
LM3350MMX
LM3350MM
Package Type
Mini SO-8
Mini SO-8
NSC Package
Drawing
MUA08A
MUA08A
Package
Marking
S00A
S00A
Supplied As
3500k Units on Tape and Reel
1000 Units on Tape and Reel
Basic Operating Circuits
Step-Up Converter
Step-Down Converter
DS100002-1
DS100002-2
Connection Diagram
Mini SO8 Package
DS100002-3
Top View
漏 1999 National Semiconductor Corporation
DS100002
www.national.com

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