Ultra-Low Power Inverting Voltage Doubler

DESCRIPTION...
The SP682 is a monolithic charge pump voltage converter that produces a doubled, negative voltage from a single positive supply. The SP682 charge pump outputs a –10V voltage from a +5V input. Three external charge pump capacitors are required to support the voltage conversion and voltage doubling process. An internal oscillator generates a 12kHz clock which cycles the internal switching that charges the storage and transfer capacitors. The charge pump architecture is fabricated using a low power BiCMOS process technology.

■ Low Power Voltage Conversion
■ +2.4V to +5.5V Input Range
■ 99% Voltage Conversion Efficiency
■ Typical 60µA Supply Current
■ Requires Only Three External Capacitors
■ Includes Low Power Shutdown Option
■ Ideal in Portable Applications Such As Handheld Instruments Cellular Phones Personal Digital Assistants Laptops and Notebooks
■ Pin Compatible Upgrade to the TC682