General Description

The TC3682/TC3683/TC3684 are CMOS charge pump converters that provide an inverted doubled output from a single positive supply. An on-board oscillator provides the clock and only three external capacitors are required for full circuit implementation. Switching frequencies are 12kHz for the TC3682, 35kHz for the TC3683, and 125kHz for the TC3684. When the SHDN pin is held at a logic low, the device goes into a very low power mode of operation consuming less than 1μA (typ) of supply current.

Features

• Small 8-Pin MSOP Package

• Operates from 1.8V to 5.5V

• 120 Ohms (typ) Output Resistance

• 99 Voltage Conversion Efficiency

• Only 3 External Capacitors Required

• Power-Saving Shutdown Mode

• Low Active Supply Current

- 95μA (typ) for TC3682

- 225μA (typ) for TC3683

- 700μA (typ) for TC3684

• Fully Compatible with 1.8V Logic Systems

Applications

• LCD Panel Bias

• Cellular Phones PA Bias

• Pagers

• PDAs, Portable Data Loggers

• Battery-Powered Devices