The TC1221/TC1222 are CMOS “charge-pump”voltage converters in ultra-small 6-Pin SOT-23Apackages. They invert and/or double an input voltagewhich can range from +1.8V to +5.5V. Conversionefficiency is typically 96%. Switching frequency is125kHz for the TC1221, 750kHz for the TC1222. Whenthe shutdown pin is held at a logic low, the device goesinto a very low power mode of operation, consumingless than 1μA of supply current.For standard voltage inverter applications, the devicerequires only two external capacitors. With a fewadditional components a positive doubler can also bebuilt. All other circuitry, including control, oscillator,power MOSFETs are integrated on-chip. Typical supplycurrents are 290μA (TC1221) and 1800μA (TC1222).All devices are available in 6-pin SOT-23A surfacemount packages.
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