156869 Datasheet, PDF (1/9 Pages) Texas Instruments – Switched Capacitor Voltage Converter

September 2005
LM2664
Switched Capacitor Voltage Converter
General Description
The LM2664 CMOS charge-pump voltage converter inverts
a positive voltage in the range of +1.8V to +5.5V to the
corresponding negative voltage of −1.8V to −5.5V. The
LM2664 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 operat-
ing 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. The device is in SOT-23-6 package.
Features
n Inverts Input Supply Voltage
n SOT23-6 Package
n 12Ω Typical Output Impedance
n 91% Typical Conversion Efficiency at 40 mA
n 1µA Typical Shutdown Current
Applications
n Cellular Phones
n Pagers
n PDAs
n Operational Amplifier Power Suppliers
n Interface Power Suppliers
n Handheld Instruments
Basic Application Circuits
Voltage Inverter
+5V to −10V Converter
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© 2005 National Semiconductor Corporation DS100031
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