LM2776 - Texas Instruments

LM2776 Switched Capacitor Inverter

The LM2776 CMOS charge-pump voltage converter inverts a positive voltage in the range from 2.7 V to 5.5 V to the corresponding negative voltage. The LM2776 uses three low-cost capacitors to provide 200 mA of output current without the cost, size, and electromagnetic interference (EMI) related to inductor-based converters. With an operating current of only 10.

Features

•1 Input Voltage: 2.7 V to 5.5 V
• 200-mA Output Current
• Inverts Input Supply Voltage
• Low-Current PFM Mode Operation
• 2-MHz Switching Frequency
• Greater than 90% Efficiency
• Current Limit and Thermal Protection
• No Inductors 2 Applications
• Operational Amplifier Power Supplies
• Interface Power Supplies
• Data Converter Supplies
• Audio Amplifier Power Supplies
• Portable Electronic Devices 2.7 V to 5.5 V 2.2 PF Typical Application LM2776 VIN VOUT -VIN @ up to 200mA EN C1+ 2.2 PF GND C1- 1 PF 3 Description The LM2776 CMOS charge-pump voltage converter inverts a positive volt.