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TC1221 - High Frequency Switched Capacitor Voltage Converters

General Description

The TC1221/TC1222 are CMOS “charge-pump” voltage converters in ultra-small 6-Pin SOT-23A packages.

They invert and/or double an input voltage which can range from +1.8V to +5.5V.

Conversion efficiency is typically 96%.

Key Features

  • TC1221/TC1222 General.

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M Features • • • • • • • • TC1221/TC1222 General Description The TC1221/TC1222 are CMOS “charge-pump” voltage converters in ultra-small 6-Pin SOT-23A packages. They invert and/or double an input voltage which can range from +1.8V to +5.5V. Conversion efficiency is typically 96%. Switching frequency is 125kHz for the TC1221, 750kHz for the TC1222. When the shutdown pin is held at a logic low, the device goes into a very low power mode of operation, consuming less than 1µA of supply current. For standard voltage inverter applications, the device requires only two external capacitors. With a few additional components a positive doubler can also be built. All other circuitry, including control, oscillator, power MOSFETs are integrated on-chip.