SP682

SP682 Corporation Micro Power Inverting Charge Pump ■ 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 Microchip's TC682 C1- 1 C2+ 2 C2- 3 VOUT 4 8 SD SP682 8 Pin MSOP 7 C1+ 6 VCC 5 GND APPLICATIONS ■ LCD Display ■ Negative bias supply for op amps ■ Serial interface protocol circuits 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. The SP682 charge pump is ideal for low power applications requiring a typical +3V battery source such as a lithium cell. Typical applications are handheld instruments, notebook and laptop computers, cellular phones, and data acquisition or GP systems. The SP682 is packaged in either 8-pin NSOIC, 8-pin MSOP for surface mount applications, and 8 Pin PDIP. TYPI...