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LM3351MM Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3351MM
Description  Switched Capacitor Voltage Converter
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM3351
Switched Capacitor Voltage Converter
General Description
The LM3351 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 LM3351 is pin for pin compatible with the
LM3350 but consumes 66% less quiescent current. The
LM3351 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 200 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 95% typical power conversion efficiency at 50 mA
n 250 nA typical shutdown current
n Low quiescent current extends battary life
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
LM3351MMX
Mini SO-8
MUA08A
S05A
3500 Units on Tape and Reel
LM3351MM
Mini SO-8
MUA08A
S05A
1000 Units on Tape and Reel
Basic Operating Circuits
Connection Diagram
Step-Up Converter
DS100146-1
Step-Down Converter
DS100146-2
Mini SO8 Package
DS100146-3
Top View
December 1999
© 1999 National Semiconductor Corporation
DS100146
www.national.com




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