REG71055-Q1 Datasheet, PDF (1/15 Pages) Texas Instruments – 30-mA 5.5-V BOOST CHARGE PUMP

REG71055-Q1
www.ti.com....................................................................................................................................................................................................... SBAS477 – JULY 2009
30-mA 5.5-V BOOST CHARGE PUMP
FEATURES
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• Qualified for Automotive Applications
• Input Voltage Range: 3.0 V to 5.5 V
• Automatic Step-Up Operation
• Low Input Current Ripple
• Low Output Voltage Ripple
• Minimum Number of External Components, No
Inductors
• 1-MHz Internal Oscillator Allows Small
Capacitors
• Shutdown Mode
• Thermal and Current Limit Protection
• 5.5-V Output Voltage
• Small TSOT23-6 (DDC) Package
DESCRIPTION
The REG71055 is a switched capacitor voltage converter that produces a regulated, low-ripple output voltage
from an unregulated input voltage. Input supply voltage of 3.0 V to 5.5 V makes the REG71055 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 below the output voltage and the output remains in regulation. It works equally well
for step-up applications 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
REG71055 is thermally protected and current limited, protecting the load and the regulator during fault
conditions. Typical ground pin current (quiescent current) is 65 µA with no load, and less than 1 µA in shutdown
mode.
C_PUMP
0.22mF
Enable
3.3V to
4.2V
REG71055
C_IN
2.2mF
GND
C_OUT
2.2mF
R
LED
R
R
LED LED
White LED Backlight Application
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated