Switched Capacitor Voltage Converters

The MAX828/829 are CMOS “charge–pump” voltage converters in ultra–small SOT–23 5 lead packages. They invert and/or double an input voltage which can range from +1.5V to +5.5V. Conversion efficiency is typically >95%. Switching frequency is 12kHz for the MAX828 and 35kHz for the MAX829.  

FEATUREs
•Charge Pump in SOT–23 5 Lead Package
•>95% Voltage Conversion Efficiency
•Voltage Inversion and/or Doubling
•Low 50 µA (MAX828) Quiescent Current
•Operates from +1.5V to +5.5V
•Up to 25 mA Output Current
•Only Two External Capacitors Required
•Tested Operating Temperature Range: –40°C to +85°C

Typical Applications
•LCD Panel Bias
•Cellular Phones
•Pagers
•PDAs, Portable Dataloggers
•Battery–Powered Devices