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FEATURES

WIDE INPUT RANGE: 1.8V TO 5.5V

5V VERSION: 2.7V TO 5.5V

AUTOMATIC STEP-UP/STEP-DOWN

OPERATION

LOW INPUT CURRENT RIPPLE

LOW OUTPUT VOLTAGE RIPPLE

MINIMUM NUMBER OF EXTERNAL

COMPONENTS—NO INDUCTORS

1MHz INTERNAL OSCILLATOR ALLOWS

SMALL CAPACITORS

“SHUTDOWN” MODE

THERMAL AND CURRENT LIMIT

PROTECTION

FIVE OUTPUT VOLTAGES AVAILABLE:

5.0V, 3.3V, 3.0V, 2.7V, 2.5V

THIN, SMALL PACKAGE: MSOP-8

APPLICATIONS

SMART CARD READERS

CELLULAR PHONES

SIM CARD SUPPLIES

PORTABLE COMMUNICATION DEVICES

PERSONAL DIGITAL ASSISTANTS

MODEMS

NOTEBOOK AND PALM-TOP COMPUTERS

ELECTRONIC GAMES

HANDHELD METERS

PCMCIA CARDS

CARD BUSES

LCD DISPLAYS

DESCRIPTION

The REG711 is a switched capacitor voltage converter,

which produces a regulated, low ripple output

voltage from an unregulated input voltage. A wide

input supply voltage of 1.8V to 5.5V makes the

REG711 ideal for a variety of battery sources, such as

single cell Li-Ion, or two and three cell Nickel or

Alkaline based chemistries.

The input voltage may vary above and below the

output voltage and the output will remain in regulation.

It works equally well for step up or down without

the need for an inductor, providing low EMI DC/DC

conversion. The high switching frequency allows the

use of small surface-mount capacitors, saving board

space and reducing cost. The REG711 is thermally

protected and current limited, protecting the load and

the regulator during fault conditions. Typical ground

pin current (quiescent current) is 1mA at full load,

60μA with no load, and less than 1μA in shutdown

mode. This regulator comes in a thin MSOP-8 package

with a component height of less than 1.1mm.