Part # LM2661 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2660 LM2661 Switched Capacitor Voltage Converter


Part Details:

LM2660/LM2661 September 1999 LM2660/LM2661Switched Capacitor Voltage ConverterGeneral Description Features Switched The LM2660/LM2661 CMOS charge-pump voltage con- n Inverts or doubles input supply voltage verter inverts a positive voltage in the range of 1.5V to 5.5V n Narrow SO-8 and Mini SO-8 Package to the corresponding negative voltage. The LM2660/LM2661 n 6.5 typical output resistance uses two low cost capacitors to provide 100 mA of output n 88% typical conversion efficiency at 100 mA current without the cost, size, and EMI related to inductor n (LM2660) selectable oscillator frequency: 10 kHz/80 kHz based converters. With an operating current of only 120 µA n (LM2661) low current shutdown mode and operating efficiency greater than 90% at most loads, the Capacitor LM2660/LM2661 provides ideal performance for batterypowered systems. The LM2660/LM2661 may also be used Applications as a positive voltage doubler. n Laptop computers The oscillator frequency can be lowered by adding an exter- n Cellular phones nal capacitor to the OSC pin. Also, the OSC pin may be used n Medical instruments to drive the LM2660/LM2661 with an external clock. For n Operational amplifier power supplies LM2660, a frequency control (FC) pin selects the oscillator V n Interface power supplies frequency of 10 kHz or 80 kHz. For LM2661, an external oltage n Handheld instruments shutdown (SD) pin replaces the FC pin. The SD pin can beused to disable the device and reduce the quiescent currentto 0.5 µA. The oscillator frequency for the LM2661 is 80 kHz. Converter Basic Application Circuits Voltage Inverter Positive Voltage Doubler 01291103 01291104 Splitting V in Half IN 01291126 © 2004 National Semiconductor Corporation DS012911 www.national.com Absolute Maximum Ratings (Note 1) Package If Military/Aerospace specified devices are required, M MM


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LM2661.pdf Datasheet