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LM3350MMX Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3350MMX
Description  Switched Capacitor Voltage Converter
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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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.
Key Specifications
n 800 kHz switch frequency allows use of very small,
inexpensive capacitors.
n 4.2
Ω typical step-up output impedance
n 1.8
Ω typical step-down output impedance
n 90% typical power conversion efficiency at 50 mA
n 250 nA typical shutdown current
Features
n Conversion of 3.3V to 5V, or 5V to 3.3V
n Small Mini SO-8 package
n No inductor required
Applications
n Any mixed 5V and 3.3V system
n Laptop computers and PDAs
n Handheld instrumentation
n PCMCIA cards
Ordering Information
Order Number
Package Type
NSC Package
Drawing
Package
Marking
Supplied As
LM3350MMX
Mini SO-8
MUA08A
S00A
3500k Units on Tape and Reel
LM3350MM
Mini SO-8
MUA08A
S00A
1000 Units on Tape and Reel
Basic Operating Circuits
Connection Diagram
Step-Up Converter
DS100002-1
Step-Down Converter
DS100002-2
Mini SO8 Package
DS100002-3
Top View
December 1999
© 1999 National Semiconductor Corporation
DS100002
www.national.com




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