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Features
Conversion of 3.3V to 5V, or 5V to 3.3V
200 kHz switch frequency allows use of very small, inexpensive capacitors.
4.2Ω typical step-up output impedance
1.8Ω typical step-down output impedance
95% typical power conversion efficiency at 50 mA
250 nA typical shutdown current
No inductor required
Low quiescent current extends battary life
Small Mini SO-8 package
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.
Applications
Any mixed 5V and 3.3V system
Laptop computers and PDAs
Handheld instrumentation
PCMCIA cards
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