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LM3355MM-4.1 Folha de dados(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM3355MM-4.1
Descrição Electrónicos  Regulated 50mA Buck-Boost Switched Capacitor DC/DC Converter
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3355MM-4.1 Folha de dados(HTML) 1 Page - National Semiconductor (TI)

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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.
Features
n
Regulated V
OUT with ±3% accuracy
n
Standard output voltage of 4.1V
n
Custom output voltages available from 1.8V to 4.1V in
100 mV increments
n
2.5V to 5.5V input voltage
n
Up to 50 mA 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 switching frequency (typical)
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
NiCd, NiMH, or alkaline battery powered systems
Typical Operating Circuit
DS200219-1
December 2001
© 2001 National Semiconductor Corporation
DS200219
www.national.com


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