Microchip TC1044SEOA713, 1 Charge Pump, DC-DC Converter 20mA, -1.5 → -12 V

The Microchip charge pump DC-DC voltage converter 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. The on-board oscillator operates at a nominal frequency 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.

Converts +5V logic supply to ±5V system
Wide input voltage range from 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
Improved ESD protection: Up to 10kV
No external diode required for high voltage operation
Frequency boost raises FOSC to 45kHz