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TC1227 Datasheet(PDF) 1 Page - Microchip Technology |
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TC1227 Datasheet(HTML) 1 Page - Microchip Technology |
1 / 9 page TC1225/6/7-1 3/24/00 TC1225 TC1226 TC1227 © 2001 Microchip Technology Inc. DS21369A Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters FEATURES s Small 8-Pin MSOP Package s Operates from 1.8V to 5.5V s Up to 5mA Output Current at –VIN Pin s Up to 1mA Output Current at –2VIN Pin s –VIN and –2VIN Outputs Available s Low Supply Current .......................................... 120 µA (MAX) for TC1225 .......................................... 360 µA (MAX) for TC1226 .......................................... 1.5mA (MAX) for TC1227 TYPICAL APPLICATIONS s LCD Panel Bias s Cellular Phones PA Bias s Pagers s PDAs, Portable Data loggers s Battery Powered Devices GENERAL DESCRIPTION The TC1225/1226/1227 are CMOS dual inverting charge pump voltage converters in 8-Pin MSOP packages. An on- board oscillator provides the clock, and only four external capacitors are required for full circuit implementation. Switch- ing 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. ORDERING INFORMATION Part No. Package Osc Freq (kHz) Temp Range TC1225EUA 8-Pin MSOP 12 –40 °C to +85°C TC1226EUA 8-Pin MSOP 35 –40 °C to +85°C TC1227EUA 8-Pin MSOP 125 –40 °C to +85°C TYPICAL OPERATING CIRCUIT C1+ C2+ VIN –VIN C1– C2 C2– C1 TC1225 TC1226 TC1227 COUT1 –2 VIN + + + – + – COUT2 OUTPUT 1 OUTPUT 2 INPUT GND PIN CONFIGURATION 1 2 3 4 8 7 6 5 TC1225 TC1226 TC1227 –2VIN –VIN VIN C2– GND C1– C1+ C2+ 8-Pin MSOP Notes: 1) C1 and COUT1 must have a voltage rating greater than or equal to VIN 2) C2 and COUT2 must have a voltage rating greater than or equal to 2VIN |
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