admin 发表于 2010-4-17 15:07:36

TC1044S Datasheet

http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gifTC1044S Datasheet


The TC1044S is a pin-compatible upgrade to the Industry standard TC7660 charge pump voltage converter. It converts a +1.5V to +12V input to a corresponding –1.5V to –12V output using only two low cost capacitors, eliminating inductors and their associated cost, size and EMI. Added features include an extended supply range to 12V, and a frequency boost pin for higher operating frequency, allowing the use of smaller external capacitors. Theon-boardoscillatoroperates atanominalfrequency of 10kHz. Frequency is increased to 45kHz when pin 1 is connected to V + . Operation below 10kHz (for lower supply current applications) is possible by connecting an external capacitor from OSC to ground (with pin 1 open). The TC1044S is available in both 8-pin DIP and 8-pin small outline (SOIC) packages in commercial and extended temperature ranges.

Parameter NameValue
Typical Active Output Current (mA)20
Output Voltage (V)Vout = -Vin or Vout = 2Vin
Typical Quiescent Current (µA)80
Input Voltage Range (V)1.5 to 12
Operating Temp. Range (°C)-45 to 85
Device DescriptionInverting or Doubling

   Features
Converts +5V Logic Supply to ±5V System
Wide Input Voltage Range ............1.5V to 12V
Efficient Voltage Conversion ............99.9%
Excellent Power Efficiency .............98%
Low Power Consumption ...........80uA @ VIN = 5V
Low Cost and Easy to Use
— Only Two External Capacitors Required
RS-232 Negative Power Supply
Available in 8-Pin Small Outline (SOIC) and 8-Pin Plastic DIP Packages
Improved ESD Protection .............Up to 10kV
No External Diode Required for High Voltage Operation
Frequency Boost Raises FOSC to 45kHz


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