SP784

® SP782/784 Programmable Charge Pump s +5V Only Low Power Voltage Conversion s Programmable Between ±5V or ±10V s Low Power Shutdown Mode Applications s RS-232/RS-423 transceiver power supplies s LCD BIAS Generator s OP-Amp Power Supplies DESCRIPTION... The SP782 and SP784 are monolithic programmable voltage converters that produce a positive and negative voltage from a single supply. The SP782 and SP784 are programmable such that the charge pump outputs either a ±10V voltage or a ±5V voltage by control of two pins. Both products require four (4) charge pump capacitors to support the resulting output voltages. The charge pump architecture (U.S. 5,760,637) is fabricated using a low power BiCMOS process technology. The SP782 and SP784 charge pumps can be powered from a single +5V supply. The low power consumption makes these charge pumps ideal for battery operated equipment. Both offer a shutdown feature that saves battery life. A system can essentially have four (4) different supply voltages from a single battery. Typical applications are handheld instruments, notebook and laptop computers, and data acquisition systems. +5V 10µF + +5V 13 14 C1+ C1– C2+ (b) C2+ (a) C2– D0 D1 LATCH SD GND 16 4 VCC 10µF 10µF + 10µF 1µF 1 12 5 6 14 1µF 1 12 5 1µF 3 LATCH C1+ C1– C2+ C2+ C2– GND 16 4 13 15 VDD 11 VCC SD VDD 11 10µF 3 SP784 SP782 VSS D0 9 D1 8 2 1µF 9 8 6 15 VSS 2 10µF SP782/SP784 DS/08 SP782/784 Programmable Charge Pump © Copyright 2000 Sipex Corporation ...