REG71055-Q1
www.ti.com. SBAS477 – JULY 2009 30-mA 5.5-V BOOST CHARGE PUMP
FEATURES 1 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 ВµA with no load, and less than 1 ВµA in shutdown
mode. …
