• Wide Input Range: 1.8V to 5.5V
• Automatic Step-Up/Step-Down Operation
• Low Input Current Ripple
• Low Output Voltage Ripple
• Minimum Number of ExternalComponents—No Inductors
• 1MHz Internal Oscillator Allows Small Capacitors
• Shutdown Mode
• Thermal and Current Limit Protection
• Six Output Voltages Available:
  • 5.5V, 5.0V, 3.3V, 3.0V, 2.7V, 2.5V
• Small Packages:
  • SOT23-6
  • TSOT23-6 (REG71055 and REG71050 Only)
  • TQFN-6 (2×2×0.8mm; REG71050 Only)
• Evaluation Modules Available:
  • REG710EVM-33, REG710EVM-5
• APPLICATIONS
  • Smart Card Readers
  • SIM Card Supplies
  • Cellular Phones
  • Portable Communication Devices
  • Personal Digital Assistants
  • Notebook and Palm-Top Computers
  • Modems
  • Electronic Games
  • Handheld Meters
  • PCMCIA Cards
  • Card Buses
  • White LED Drivers
  • LCD Displays
  • Battery Backup Supplies

The REG710 is a switched capacitor voltage converterthat 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 REG710 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 remains in regulation. It works equally well for step-up or step-down 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 REG710 is thermally protected and current limited, protecting the load and the regulator during fault conditions. Typical ground pin current (quiescent current) is 65µA with no load, and less than 1µA in shutdown mode.