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LM2661MM Datasheet

  • LM2661MM

  • Switched Capacitor Voltage Converter

  • 12頁

  • NSC

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LM2660/LM2661 Switched Capacitor Voltage Converter
September 1999
LM2660/LM2661
Switched Capacitor Voltage Converter
General Description
The LM2660/LM2661 CMOS charge-pump voltage con-
verter inverts a positive voltage in the range of 1.5V to 5.5V
to the corresponding negative voltage. The LM2660/LM2661
uses two low cost capacitors to provide 100 mA of output
current without the cost, size, and EMI related to inductor
based converters. With an operating current of only 120 碌A(chǔ)
and operating efficiency greater than 90% at most loads, the
LM2660/LM2661 provides ideal performance for battery
powered systems. The LM2660/LM2661 may also be used
as a positive voltage doubler.
The oscillator frequency can be lowered by adding an exter-
nal capacitor to the OSC pin. Also, the OSC pin may be used
to drive the LM2660/LM2661 with an external clock. For
LM2660, a frequency control (FC) pin selects the oscillator
frequency of 10 kHz or 80 kHz. For LM2661, an external
shutdown (SD) pin replaces the FC pin. The SD pin can be
used to disable the device and reduce the quiescent current
to 0.5 碌A(chǔ). The oscillator frequency for the LM2661 is 80 kHz.
Features
n
n
n
n
n
n
Inverts or doubles input supply voltage
Narrow SO-8 and Mini SO-8 Package
6.5鈩?typical output resistance
88% typical conversion efficiency at 100 mA
(LM2660) selectable oscillator frequency: 10 kHz/80 kHz
(LM2661) low current shutdown mode
Applications
n
n
n
n
n
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Laptop computers
Cellular phones
Medical instruments
Operational amplifier power supplies
Interface power supplies
Handheld instruments
Basic Application Circuits
Voltage Inverter
Positive Voltage Doubler
DS012911-3
DS012911-4
Splitting V
IN
in Half
DS012911-26
漏 1999 National Semiconductor Corporation
DS012911
www.national.com

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