LM2681 Datasheet (National Semiconductor) - Switched Capacitor Voltage Converter

LM2681, Switched Capacitor Voltage Converter

The LM2681 CMOS charge-pump voltage converter operates as a voltage doubler for an input voltage in the range of +2.5V to +5.5V.

Two low cost capacitors and a diode (needed during start-up) is used in this circuit to provide up to 20 mA of output current.

The LM2681 can also work as a voltage divide

LM2681 Features

* n n n n Doubles or Splits Input Supply Voltage SOT23-6 Package 15Ω Typical Output Impedance 90% Typical Conversion Efficiency at 20 mA Applications n n n n n n Cellular Phones Pagers PDAs Operational Amplifier Power Suppliers Interface Power Suppliers Handheld Instruments Basic Application Circuit