1 Features
1• Inverts Input Supply Voltage
• 6-Pin SOT-23 Package
• 12-Ω Typical Output Impedance
• 91% Typical Conversion Efficiency at 40 mA
• 1-μA Typical Shutdown Current

2 Applications
• Cellular Phones
• Pagers
• PDAs
• Operational Amplifier Power Suppliers
• Interface Power Suppliers
• Handheld Instruments

3 Description
The LM2664 CMOS charge-pump voltage converter
inverts a positive voltage in the range of 1.8 V to 5.5 V to the corresponding negative voltage of −1.8 V to
−5.5 V. The device uses two low-cost capacitors to
provide up to 40 mA of output current.
The LM2664 operates at 160-kHz oscillator frequency
to reduce output resistance and voltage ripple. With
an operating current of only 220 μA (operating
efficiency greater than 91% with most loads) and 1- μA typical shutdown current, the LM2664 provides
ideal performance for battery-powered systems.