LM3355EVAL National Semiconductor, LM3355EVAL Datasheet

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LM3355EVAL

Manufacturer Part Number
LM3355EVAL
Description
Manufacturer
National Semiconductor
Datasheet
1.LM3355EVAL.pdf (10 pages)

Specifications of LM3355EVAL

Lead Free Status / Rohs Status
Not Compliant
© 2004 National Semiconductor Corporation
LM3355
Regulated 50mA Buck-Boost Switched Capacitor DC/DC
Converter
General Description
The LM3355 is a CMOS switched capacitor DC/DC con-
verter that produces a regulated output voltage by automati-
cally stepping up (boost) or stepping down (buck) the input
voltage. It accepts an input voltage between 2.5V and 5.5V.
The LM3355 is available with a standard output voltage of
4.1V (ideal for white LED applications). If other output volt-
age options between 1.8V and 4.1V are desired for other
applications, please contact your National Semiconductor
representative.
The LM3355’s proprietary buck-boost architecture enables
up to 50 mA of load current at an average efficiency greater
than 75%. Typical operating current is only 375 µA and the
typical shutdown current is only 2.3 µA.
The LM3355 is available in a 10-pin MSOP package. This
package has a maximum height of only 1.1 mm.
The high efficiency of the LM3355, low operating and shut-
down currents, small package size, and the small size of the
overall solution make this device ideal for battery powered,
portable, and hand-held applications.
See the LM3352 for up to 200mA of output current.
Typical Operating Circuit
DS200219
Features
n Regulated V
n Standard output voltage of 4.1V
n Custom output voltages available from 1.8V to 4.1V in
n 2.5V to 5.5V input voltage
n Up to 50 mA output current
n
n Uses few, low-cost external components
n Very small solution size
n 375 µA typical operating current
n 2.3 µA typical shutdown current
n 1 MHz switching frequency (typical)
n Architecture and control methods provide high load
n MSOP-10 package
n Over-temperature protection
Applications
n White LED display backlights
n 1-cell Lilon battery-operated equipment including PDAs,
n Flat panel displays
n Hand-held instruments
n NiCd, NiMH, or alkaline battery powered systems
100 mV increments
current and good efficiency
hand-held PCs, cellular phones
>
75% average efficiency
OUT
with
±
20021901
3% accuracy
December 2001
www.national.com

LM3355EVAL Summary of contents

Page 1

... The LM3355 is available with a standard output voltage of 4.1V (ideal for white LED applications). If other output volt- age options between 1.8V and 4.1V are desired for other applications, please contact your National Semiconductor representative. The LM3355’s proprietary buck-boost architecture enables load current at an average efficiency greater than 75%. Typical operating current is only 375 µ ...

Page 2

Connection Diagram Ordering Information Order Number LM3355MMX-4.1 MSOP-10 LM3355MM-4.1 MSOP-10 Pin Description Pin Number www.national.com 20021902 Top View MSOP-10 Pin Package See NS Package Number MUB10A Package Type NSC Package ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. All Pins Power Dissipation (T = 25˚C) A (Note 2) T (Note 2) JMAX θ (Note 2) JA Storage Temperature Lead Temperature (Soldering, 5 sec.) ESD Rating (Note 3) ...

Page 4

Electrical Characteristics Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% tested or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed by correlation using ...

Page 5

Typical Performance Characteristics Unless otherwise specified T = 25˚ vs. V OUT IN Efficiency vs Operating Quiescent Current vs 20021904 Load Transient Response 20021920 Switching Frequency vs. V 20021924 5 V vs. V OUT ...

Page 6

Typical Performance Characteristics Maximum V Ripple vs. C OUT www.national.com Unless otherwise specified T Maximum V OUT 20021932 6 = 25˚C. (Continued) A Ripple vs. C OUT OUT 20021930 ...

Page 7

Applications Information Operating Principle The LM3355 is designed to provide a step-up/step-down voltage regulation in battery powered systems. It combines switched capacitor circuitry, reference, comparator, and shutdown logic in a single 10-pin MSOP package. The LM3355 can provide a regulated ...

Page 8

Filter Capacitor Selection iii) Polymer Electrolytic Polymer electrolytic is a third suitable technology. Polymer capacitors provide some of the best features of both the ceramic and the tantalum technologies. They provide very low ESR values while still achieving high capacitance ...

Page 9

Typical Application Circuits FIGURE 3. Low Output Noise and Ripple Buck/Boost Regulator Layout Considerations Due to the 1 MHz typical switching frequency of the LM3355, careful board layout is a must important to place the FIGURE 2. Basic ...

Page 10

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...