Features • Conversion of 3.3V to 5V, or 5V to 3.3V • 200 kHz switch frequency allows use of very small, inexpensive capacitors. • 4.2 typical step-up output impedance • 1.8 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

LM3351   2.20 <= V in Lower  V   <= V in Upper  V   <= 5.50 V out 1.47 <=  V <= 5.47 I out    A <= 0.05 Ambient Temperature  °C <= 100 What are WEBENCH® tools? MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM3351 Switched Capacitor Voltage Converter	298 Kbytes	20-Oct-04	日本語

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	AN-1142: Application Note 1142 LM2661/3/4 Evaluation Board	186 Kbytes	4-Oct-04

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Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3351MM	CS080	0	30535	0	0	2810500	2	797458048
LM3351MMX	CS080	0	30535	0	0	2810500	2	797458048

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM3351MM	NONE	NONE	30 Nov 2009
LM3351MMX	NONE	NONE	30 Nov 2009