LM3350 MWC/NOPB National Semiconductor, LM3350 MWC/NOPB Datasheet

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LM3350 MWC/NOPB

Manufacturer Part Number
LM3350 MWC/NOPB
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LM3350 MWC/NOPB

Lead Free Status / Rohs Status
Compliant
© 2010 National Semiconductor Corporation
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.
Basic Operating Circuits
100002 Version 6 Revision 2
100002
Step-Down Converter
Step-Up Converter
LM3350
Print Date/Time: 2010/12/28 23:06:13
Features
Applications
Conversion of 3.3V to 5V, or 5V to 3.3V
4.2Ω typical step-up output impedance
1.8Ω typical step-down output impedance
90% typical power conversion efficiency at 50 mA
800 kHz switch frequency allows use of very small,
inexpensive capacitors.
No inductor required
250 nA typical shutdown current
Small Mini SO-8 package
Any mixed 5V and 3.3V system
Laptop computers and PDAs
Handheld instrumentation
PCMCIA cards
10000202
10000201
December 28, 2010
OBSOLETE
www.national.com

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LM3350 MWC/NOPB Summary of contents

Page 1

... 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. Basic Operating Circuits © 2010 National Semiconductor Corporation 100002 Version 6 Revision 2 LM3350 Features ■ Conversion of 3. 3.3V ■ ...

Page 2

Connection Diagram Ordering Information Order Number Package Type LM3350MMX Mini SO-8 LM3350MM Mini SO-8 Pin Descriptions www.national.com Mini SO8 Package 10000203 Top View NSC Package Package Marking Drawing MUA08A S00A MUA08A S00A Pin Name Function 1 Cap1+ Positive terminal for ...

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... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Input Voltage, Step-Down Maximum Input Voltage, Step-Up Power Dissipation ( =25° (Note 2)) θ (Note Max (Note 2) Storage Temperature Lead Temperature (Soldering, 10 secs) ...

Page 4

Electrical Characteristics 2/3 Step-Down Voltage Converter Specifications in standard type face are for T range. Unless otherwise specified, V Symbol Parameter V Output Voltage at No C1, C2, C out NL Load at 1MHz Output Voltage at 50 ...

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Typical Performance Characteristics (Step-Up) out load Output Source Impedance vs Temperature (Step-Up (Step-Down) η load 100002 Version 6 Revision 2 10000204 V 10000209 Output Source Impedance vs Temperature (Step-Down) 10000207 5 Print Date/Time: 2010/12/28 ...

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Switching Frequency vs Temperature www.national.com 10000210 6 100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13 ...

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Detailed Operation OPERATING PRINCIPLE The LM3350 is a charge-pump voltage converter that pro- vides a voltage conversion ratio of 3/2 in step-up mode and a conversion ratio of 2/3 in the step-down mode. Thus it can be used in the ...

Page 8

Typical Application Circuits Layout Information LAYOUT CONSIDERATIONS The LM3350's high switching frequency (800 kHz) makes a good layout important. Figure 4 illustrates a typical layout important to keep the distance short between the four ca- pacitors and the ...

Page 9

A. Copper side (5X) C. Copper side with Component Locations (5X) FIGURE 4. Typical Layout 100002 Version 6 Revision 2 10000216 B. Actual Size of the Layout 10000217 9 Print Date/Time: 2010/12/28 23:06:13 www.national.com ...

Page 10

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 8-Lead Mini SO (MM) Order Number LM3350MMX or LM3350MM NS Package Number MUA08A 10 100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13 ...

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Notes 11 100002 Version 6 Revision 2 Print Date/Time: 2010/12/28 23:06:13 www.national.com ...

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