LM3354-3.7 Datasheet, PDF (2/14 Pages) Texas Instruments – LM3354-3.7 Regulated 90mA Buck-Boost Switched Capacitor DC/DC Converter

LM3354-3.7
OBSOLETE
September 24, 2011
Regulated 90mA Buck-Boost Switched Capacitor DC/DC
Converter
General Description
The LM3354 is a CMOS switched capacitor DC/DC converter
that produces a regulated output voltage by automatically
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 Semiconductor rep-
resentative.
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
■ ^{Regulated V}_OUT ^{with ±3% accuracy}
■ ^{Standard output voltages of 1.8V, 3.3V, 4.1V, and 5.0V}
also available
■ ^{Custom output voltages available from 1.8V to 5.0V in 100}
mV increments with volume order
■ ^{2.5V to 5.5V input voltage range}
■ ^{Up to 90mA output current}
■ ^{>75% average efficiency}
■ ^{Uses few, low-cost external components}
■ ^{Very small solution size}
■ ^{375 µA typical operating current}
■ ^{2.3 µA typical shutdown current}
■ ^{1 MHz typical switching frequency}
■ ^{Architecture and control methods provide high load}
current and good efficiency
■ ^{MSOP-10 package}
■ ^{Over-temperature protection}
Applications
■ ^{White LED display backlights}
■ ^{1-cell Lilon battery-operated equipment including PDAs,}
hand-held PCs, cellular phones
■ ^{Flat panel displays}
■ ^{Hand-held instruments}
■ ^{Li-Ion, NiCd, NiMH, or alkaline battery powered systems}
Typical Operating Circuit
20057301
© 2011 National Semiconductor Corporation 200573
200573 Version 2 Revision 2 Print Date/Time: 2011/09/24 07:05:25
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