LM3354-37 National Semiconductor, LM3354-37 Datasheet

LM3354-37

Manufacturer Part Number

LM3354-37

Description

Regulated 90mA Buck-Boost Switched Capacitor DC/DC

Manufacturer

National Semiconductor

Datasheet

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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.

Typical Operating Circuit

DS200573

Features

n Regulated V

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

n 2.5V to 5.5V input voltage range

n Up to 90mA output current

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

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 Li-Ion, NiCd, NiMH, or alkaline battery powered systems

also available

100 mV increments with volume order

current and good efficiency

hand-held PCs, cellular phones

75% average efficiency

OUT

with

20057301

3% accuracy

November 2002

www.national.com

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