Microchip Technology TCM680
The TCM680 is a dual charge pump, voltage converter that produces output voltages of +2VIN and -2VIN from a single input voltage of +2.0V to +5.5V. The TCM680 is packaged in 8-pin SOIC and PDIP packages and requires only four inexpensive, external capacitors. The charge pumps are clocked by an onboard 8 kHz oscillator.| Part No. | TCM680 |
|---|---|
| Datasheet | TCM680 Download |
| Manufacturer |  Microchip Technology |
| Description | Voltage Converter |
| Buy | Stock & Price |
FEATURES
● 99% Voltage Conversion Efficiency● 85% Power Conversion Efficiency
● Input Voltage Range: - +2.0V to +5.5V
● Only 4 External Capacitors Required
● 8-Pin SOIC Package
APPLICATIONS
● ±10V From +5V Logic Supply● ±6V From a 3V Lithium Cell
● Handheld Instruments
● Portable Cellular Phones
● LCD Display Bias Generator
● Panel Meters
● Operational Amplifier Power Supplies Typical Operating Circuit +5V C1+ 4.7 µF C2 + 4.7 µF GND C1+ VIN VOUT+ C1- TCM680 C2+ VOUT- C2- GND C4 + 4.7 µF VOUT+ = (2 x VIN) VOUT- = -(2 x VIN) C3 + 4.7 µF GND
GENERAL DESCRIPTION
Common applications include ±10V from a single +5V logic supply and ±6V from a +3V lithium battery. Low output source impedances (typically 140 Ω) provide maximum output currents of 10 mA for each output. Typical power conversion efficiency is 85%. High efficiency, small size and low cost make the TCM680 suitable for a wide variety of applications that need both positive and negative power supplies derived from a single input voltage.
