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LM3351 Product Folder

Switched Capacitor Voltage Converter

Generic P/N 3351

WEBENCH Live Simulation!

LM3351 Webench™ Custom Design/Analyze/Build It
2.2 <=	V in Lower V	<=	V in Upper V	<= 5.5
V out	1.5 <=		V	<= 5.5
I out			A	<= 0.05
Ambient Temperature			°C	<= 100
What is Webench?

Parametric Table

Temperature Min (deg C)	-40
Temperature Max (deg C)	85
Multiple Output Capability	No
On/Off Pin	Yes
Error Flag	No
InputMin Voltage (Volt)	2.20
InputMax Voltage (Volt)	5.50
Output Current (mA)	50
Adjustable Output	No
Switching Frequency (Hz)	200000
Adj Switch Frequency	No
Sync Pin	No
Efficiency (%)	95
Inverting	No
Step-Up	Yes
Step-Down	Yes
RegType	Switched Capacitor

Datasheet

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
LM3351 Switched Capacitor Voltage Converter	265 Kbytes	7-Dec-99	View Online	Download	Receive via Email
LM3351 Switched Capacitor Voltage Converter (JAPANESE)	280 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Status

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking

Type

Pins

MSL/Lead-Free Availability

Lead
Time

Qty

SPICE

IBIS

Qty

$US each

LM3351MM

MINI SOIC

Status

Full production

N/A

1K+

$0.76

reel
of
1000

ZXTT
S05A

8-9 weeks

10000

LM3351MMX

MINI SOIC

Status

Full production

N/A

1K+

$0.76

reel
of
3500

ZXTT
S05A

8-9 weeks

10000

LM3351 MDC

Unpackaged Die

Full production

N/A

gel pak
of
N/A

N/A

LM3351 MWC

Wafer

Full production

N/A

wafer jar
of
N/A

N/A

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.

Features

Conversion of 3.3V to 5V, or 5V to 3.3V
Small Mini SO-8 package
No inductor required

Key Specification

200 kHz switch frequency allows use of very small, inexpensive capacitors.
4.2Ohm typical step-up output impedance
1.8Ohm typical step-down output impedance
95% typical power conversion efficiency at 50 mA
250 nA typical shutdown current
Low quiescent current extends battary life

Applications

Any mixed 5V and 3.3V system
Laptop computers and PDAs
Handheld instrumentation
PCMCIA cards

Reliability Metrics

Part Number	Process	Early Failure Rate - Rejects	Sample Size (EFR)	PPM *	Device Hours	Long Term Failure Rates (FITS)	MTTF
LM3351 MDC	CS080	13	22200	586	1346000	90	11224278
LM3351 MWC	CS080	13	22200	586	1346000	90	11224278
LM3351MM	CS080	13	22200	586	1346000	90	11224278
LM3351MMX	CS080	13	22200	586	1346000	90	11224278

For more information on Reliablitity Metrics, please click here.

Application Notes

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
AN-1142: Application Note 1142 LM2661/3/4 Evaluation Board	186 Kbytes	20-Sep-02	View Online	Download	Receive via Email

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[Information as of 15-Jan-2004]

LM3351 Product Folder