The TC7660 is a monolithic CMOS voltage converter manufactured by TelCom Semiconductor (later acquired by Maxim Integrated). It is designed to convert a positive input voltage to a corresponding negative output voltage. The device is commonly used in applications where a negative supply voltage is required but only a positive supply is available.

Applications:

• Generating negative supplies for op-amps
• LCD bias supplies
• Handheld instruments
• Data acquisition systems
• Battery-powered devices

Features:

• Wide input voltage range: 1.5V to 10V
• High voltage conversion efficiency: Typically >95%
• Low quiescent current: Typically 170μA
• No external diodes required
• Simple to use: Requires only two external capacitors
• CMOS technology for low power consumption

Benefits:

• Eliminates the need for a separate negative power supply
• Extends battery life in portable applications due to low power consumption
• Reduces component count and board space
• Simplified circuit design due to integrated functionality
• High reliability due to CMOS construction

Technical Specifications:

• Input Voltage Range: 1.5V to 10V
• Output Voltage: -Vin
• Conversion Efficiency: >95%
• Quiescent Current: 170μA (typical)
• Operating Temperature: -20°C to +85°C

The TC7660 operates as a switched-capacitor voltage inverter. It uses four internal MOSFET switches and an oscillator to transfer charge from the input capacitor to the output capacitor, effectively inverting the voltage. The device is available in various packages, including DIP and SOIC. Its simplicity and efficiency make it a popular choice for generating negative voltages in a wide range of electronic applications.