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 divider to split a voltage in the range of +1.8V to +11V in half.
The LM2681 operates at 160 kHz oscillator frequency to reduce output resistance and
voltage ripple. With an operating current of only 550 µA (operating efficiency greater than 90%
with most loads) the LM2681 provides ideal performance for battery powered systems. The device is
in a SOT-23, 6-lead package.
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