TC1227

TC1225 TC1226 TC1227 Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters FEATURES s s s s s s Small 8-Pin MSOP Package Operates from 1.8V to 5.5V Up to 5mA Output Current at –VIN Pin Up to 1mA Output Current at –2VIN Pin –VIN and –2VIN Outputs Available Low Supply Current .......................................... 120µA (MAX) for TC1225 .......................................... 360µA (MAX) for TC1226 .......................................... 1.5mA (MAX) for TC1227 GENERAL DESCRIPTION The TC1225/1226/1227 are CMOS dual inverting charge pump voltage converters in 8-Pin MSOP packages. An onboard oscillator provides the clock, and only four external capacitors are required for full circuit implementation. Switching frequencies are 12kHz for the TC1225, 35kHz for the TC1226, and 125kHz for the TC1227. These devices provide both a negative voltage inversion (available at the –VIN output) and a negative doubling voltage inversion (available at the –2 VIN output), with a low output impedance capable of providing output currents up to 5mA for the –VIN output and 1mA for the –2VIN output. The input voltage can range from +1.8V to +5.5V. TYPICAL APPLICATIONS s s s s s LCD Panel Bias Cellular Phones PA Bias Pagers PDAs, Portable Data loggers Battery Powered Devices ORDERING INFORMATION Part No. TC1225EUA TC1226EUA TC1227EUA Package Osc Freq (kHz) Temp Range 8-Pin MSOP 8-Pin MSOP 8-Pin MSOP 12 35 125 –40°C to +85°C –40°C to +85°C –40°C to +85°C TYPICAL OPERATING CIRCUIT C1+...