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TC1225

Microchip Technology
Part Number TC1225
Manufacturer Microchip Technology
Description Inverting Dual Charge Pump Voltage Converters
Published Aug 31, 2005
Detailed Description TC1225 TC1226 TC1227 Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converters FEATURES s s s s s s Small 8-Pin MSOP P...
Datasheet PDF File TC1225 PDF File

TC1225
TC1225

Overview
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+ C1– C2+ + C1 VIN –VIN INPUT OUTPUT 1 PIN CONFIGURATION 8-Pin MSOP C1– C2+ C2– 1 2 3 4 TC1225 TC1226 TC1227 8 –VIN 7 C1+ + C2 TC1225 TC1226 C2– TC1227 GND – COUT1 + 6 VIN 5 GND –2 VIN – COUT2 + OUTPUT 2 –2VIN 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 © 2001 Microchip Technology Inc.
DS21369A TC1225/6/7-1 3/24/00 Inverting Dual (–VIN, –2VIN) Charge Pump Voltage Converte...


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