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PDF LM3354MM-3.3 Data sheet ( Hoja de datos )

Número de pieza LM3354MM-3.3
Descripción Regulated 90mA Buck-Boost Switched Capacitor DC/DC Converter
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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February 2002
LM3354
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 available with standard output voltages of
1.8V, 3.3V, 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 repre-
sentative.
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% (5.0V, 4.1V, and 3.3V
options) or ±4% (1.8V option) accuracy
n Standard output voltages of 1.8V, 3.3V, 4.1V, and 5.0V
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 (5.0V, 4.1V, and 1.8V options) or 70mA
(3.3V option) 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 DS200188
DS200188-1
www.national.com

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LM3354MM-3.3 pdf
Typical Performance Characteristics Unless otherwise specified TA = 25˚C. (Continued)
VOUT vs. VIN
VOUT vs. VIN
VOUT vs. VIN
DS200188-4
VOUT vs. VIN
DS200188-5
VOUT vs. VIN
DS200188-34
VOUT vs. VIN
DS200188-35
DS200188-36
5
DS200188-37
www.national.com

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LM3354MM-3.3 arduino
Driving Light Emitting Diodes
The LM3354 can be used to drive LED’s of nearly any color.
The 4.1V option is ideal for driving the White LED’s required
for the backlight of small color displays. Figure 4 shows the
circuit used to power White LED’s. The LED current is set by
the resistors RB by using the equation ILED = (4.1V − VF)/RB
where VF is the typical forward voltage drop of the LED used.
The brightness of the diodes may be controlled using the
shutdown pin. A PWM signal on the shutdown pin may be
used to adjust the brightness by varying the duty cycle. A
signal between 60Hz and 200Hz may be used for best
linearity. In this case the equivalent LED current is approxi-
mately equal to the maximum current multiplied by the duty
cycle. Using frequencies above 200Hz may cause less linear
results as the charge and discharge time of the output
capacitor becomes more significant.
Layout Considerations
Due to the 1 MHz typical switching frequency of the LM3354,
careful board layout is a must. It is important to place the
capacitors as close to the IC as possible and to keep the
traces between the capacitors and the IC short and direct.
Use of a ground plane is recommended. Figure 5 shows a
typical layout as used in the LM3354 evaluation board.
DS200188-16
FIGURE 5. Typical Layout, Top View (magnification 1.5X)
11 www.national.com

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