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PDF LM3354-37 Data sheet ( Hoja de datos )
| Número de pieza | LM3354-37 | |
| Descripción | Regulated 90mA Buck-Boost Switched Capacitor DC/DC | |
| Fabricantes | National Semiconductor | |
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November 2002
LM3354-3.7
Regulated 90mA Buck-Boost Switched Capacitor DC/DC
Converter
General Description
The LM3354 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 LM3354 is also available with standard output voltages
of 1.8V, 3.3V, 3.7V, 4.1V (ideal for white LED applications),
and 5.0V. If other output voltage options between 1.8V and
5.0V are desired, please contact your National Semiconduc-
tor representative.
The LM3354’s proprietary buck-boost architecture enables
up to 90mA 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 LM3354 is available in a 10-pin MSOP package. This
package has a maximum height of only 1.1 mm.
The high efficiency of the LM3354, 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 or the
LM3355 for up to 50mA of output current.
Features
n Regulated VOUT with ±3% accuracy
n Standard output voltages of 1.8V, 3.3V, 4.1V, and 5.0V
also available
n Custom output voltages available from 1.8V to 5.0V in
100 mV increments with volume order
n 2.5V to 5.5V input voltage range
n Up to 90mA output current
n >75% average efficiency
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 typical switching frequency
n Architecture and control methods provide high load
current and good efficiency
n MSOP-10 package
n Over-temperature protection
Applications
n White LED display backlights
n 1-cell Lilon battery-operated equipment including PDAs,
hand-held PCs, cellular phones
n Flat panel displays
n Hand-held instruments
n Li-Ion, NiCd, NiMH, or alkaline battery powered systems
Typical Operating Circuit
© 2002 National Semiconductor Corporation DS200573
20057301
www.national.com
1 page  
Typical Performance Characteristics Unless otherwise specified TA = 25˚C.
VOUT vs. VIN
VOUT vs. VIN
Efficiency vs. VIN
20057341
20057342
Load Transient Response
Operating Quiescent
Current vs. VIN
20057320
20057314
Switching Frequency vs. VIN
20057324
5
20057323
www.national.com
5 Page 
Physical Dimensions inches (millimeters)
unless otherwise noted
MSOP-10 Pin Package (MM)
For Ordering, Refer to Ordering Information Table
NS Package Number MUB10A
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Email: [email protected]
www.national.com
National Semiconductor
Europe
Fax: +49 (0) 180-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: [email protected]
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM3354-37.PDF ] | |
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