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.