Part # LM2681 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2681 Switched Capacitor Voltage Converter

Part Details:

LM2681 January 2003 Switched LM2681Switched Capacitor Voltage ConverterGeneral Description Features The LM2681 CMOS charge-pump voltage converter oper- n Doubles or Splits Input Supply Voltage Capacitor ates as a voltage doubler for an input voltage in the range of n SOT23-6 Package +2.5V to +5.5V. Two low cost capacitors and a diode n 15 Typical Output Impedance (needed during start-up) is used in this circuit to provide up n 90% Typical Conversion Efficiency at 20 mA to 20 mA of output current. The LM2681 can also work as avoltage divider to split a voltage in the range of +1.8V to Applications +11V in half. n Cellular Phones The LM2681 operates at 160 kHz oscillator frequency to V reduce output resistance and voltage ripple. With an operat- n Pagers oltage ing current of only 550 µA (operating efficiency greater than n PDAs 90% with most loads) the LM2681 provides ideal perfor- n Operational Amplifier Power Suppliers mance for battery powered systems. The device is in SOT- n Interface Power Suppliers 23-6 package. n Handheld Instruments Converter Basic Application Circuits Voltage Doubler 10096501 Splitting V in Half in 10096502 © 2003 National Semiconductor Corporation DS100965 Absolute Maximum Ratings (Note 1) T (Note 3) 150°C JMax If Military/Aerospace specified devices are required, (Note 3) 210°C/W JA LM2681 please contact the National Semiconductor Sales Office/ Operating Junction

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LM2681.pdf Datasheet