Datasheet > LM3355MMX-4.1

LM3355MMX-4.1

更新时间： 2024-09-20 04:44:27

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描述
Regulated 50mA Buck-Boost Switched Capacitor DC/DC Converter

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LM3355MMX-4.1 数据手册

December 2001

LM3355

Regulated 50mA Buck-Boost Switched Capacitor DC/DC

Converter

General Description

Features

n Regulated V_OUTwith 3% accuracy

n Standard output voltage of 4.1V

n Custom output voltages available from 1.8V to 4.1V in

100 mV increments

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.

n 2.5V to 5.5V input voltage

n Up to 50 mA output current

75% average efficiency

n Uses few, low-cost external components

n Very small solution size

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.

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

The LM3355 is available in a 10-pin MSOP package. This

package has a maximum height of only 1.1 mm.

n MSOP-10 package

n Over-temperature protection

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.

Applications

n White LED display backlights

See the LM3352 for up to 200mA of output current.

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

DS200219

www.national.com

12 3 4 5 6 7...9

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