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.

Features

• Charge Pumps in 6-Pin SOT-23A Package

• 96 Voltage Conversion Efficiency

• Voltage Inversion and/or Doubling

• Operates from +1.8V to +5.5V

• Up to 25mA Output Current

• Only Two External Capacitors Required

• Power-Saving Shutdown Mode

• Fully Compatible with 1.8V Logic Systems

Applications

• LCD Panel Bias

• Cellular Phones

• Pagers

• PDAs, Portable Data Loggers

• Battery-Powered Devices