The MAX660 CMOS charge-pump voltage converter is a versatile unregulated
switched-capacitor inverter or doubler. Operating from a wide 1.5-V to 5.5-V supply voltage, the
MAX660 uses two low-cost capacitors to provide 100 mA of output current without the cost, size and
EMI related to inductor-based converters. With an operating current of only 120 µA and operating
efficiency greater than 90% at most loads, the MAX660 provides ideal performance for
battery-powered systems. MAX660 devices can be operated directly in parallel to lower output
impedance, thus providing more current at a given voltage.
The FC (frequency control) pin selects between a nominal 10-kHz or 80-kHz oscillator
frequency. The oscillator frequency can be lowered by adding an external capacitor to the OSC pin.
Also, the OSC pin may be used to drive the MAX660 with an external clock up to 150 kHz. Through
these methods, output ripple frequency and harmonics may be controlled.
Additionally, the MAX660 may be configured to divide a positive input voltage precisely
in half. In this mode, input voltages as high as 11 V may be used.
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