REG711
REG
711
www.ti.com
50mA SWITCHED-CAP DC/DC CONVERTER
FEATURES
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WIDE INPUT RANGE: 1.8V TO 5.5V
5V VERSION: 2.7V TO 5.5V
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AUTOMATIC STEP-UP/STEP-DOWN
OPERATION
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LOW INPUT CURRENT RIPPLE
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LOW OUTPUT VOLTAGE RIPPLE
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MINIMUM NUMBER OF EXTERNAL
COMPONENTS鈥擭O INDUCTORS
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1MHz INTERNAL OSCILLATOR ALLOWS
SMALL CAPACITORS
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鈥淪HUTDOWN鈥?MODE
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THERMAL AND CURRENT LIMIT
PROTECTION
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FIVE OUTPUT VOLTAGES AVAILABLE:
5.0V, 3.3V, 3.0V, 2.7V, 2.5V
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THIN, SMALL PACKAGE: MSOP-8
DESCRIPTION
The REG711 is a switched capacitor voltage con-
verter, 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 regula-
tion. 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,
60碌A with no load, and less than 1碌A in shutdown
mode. This regulator comes in a thin MSOP-8 pack-
age with a component height of less than 1.1mm.
APPLICATIONS
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SMART CARD READERS
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CELLULAR PHONES
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SIM CARD SUPPLIES
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PORTABLE COMMUNICATION DEVICES
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PERSONAL DIGITAL ASSISTANTS
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MODEMS
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NOTEBOOK AND PALM-TOP COMPUTERS
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ELECTRONIC GAMES
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HANDHELD METERS
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PCMCIA CARDS
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CARD BUSES
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LCD DISPLAYS
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C
IN
+
PGND
ENABLE
C
PUMP
REG711
R
C
OUT
GND
LED
Copyright 漏 2000, Texas Instruments Incorporated
SBVS027A
Printed in U.S.A. February, 2001
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