Charge-pump converter with polarity flexibility
The MAX660ESA+T is a charge-pump DC-DC converter from Analog Devices that generates either a negative output voltage equal to -Vin or a doubled positive output of 2Vin from a single positive input rail. This ratiometric topology means the output tracks the input ratio, so a 5V input yields either -5V or +10V without an inductor. The 100mA output current rating is practical for auxiliary rails powering op-amps, comparators, or small analog front-ends in mixed-signal designs.
10kHz or 80kHz — choosing the switching frequency
The part offers two selectable switching frequencies: 10kHz and 80kHz. The 10kHz setting minimizes switching losses and quiescent current, making it suitable for battery-powered or low-noise applications where ripple filtering is easier. The 80kHz setting allows smaller external capacitors — typically 10µF instead of 100µF — which saves board area. If your design runs near the 100mA output limit at 80kHz, watch the capacitor ESR; ceramic X5R or X7R types keep ripple under control.
The date-code and marking should trace cleanly through authorized distribution; for independent-channel procurement, lot traceability and a decap/X-ray check on the first sample are recommended to verify the die matches the known MAX660 layout.