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LM2665 Datasheet

  • LM2665

  • Switched Capacitor Voltage Converter

  • 9頁(yè)

  • NSC

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LM2665 Switched Capacitor Voltage Converter
November 1999
LM2665
Switched Capacitor Voltage Converter
General Description
The LM2665 CMOS charge-pump voltage converter oper-
ates as a voltage doubler for an input voltage in the range of
+2.5V to +5.5V. Two low cost capacitors and a diode
(needed during start-up) are used in this circuit to provide up
to 40 mA of output current. The LM2665 can also work as a
voltage divider to split a voltage in the range of +1.8V to
+11V in half.
The LM2665 operates at 160 kHz oscillator frequency to re-
duce output resistance and voltage ripple. With an operating
current of only 650 碌A(chǔ) (operating efficiency greater than 90%
with most loads) and 1碌A(chǔ) typical shutdown current, the
LM2665 provides ideal performance for battery powered
systems. The device is in SOT-23-6 package.
Features
n
n
n
n
n
Doubles or Splits Input Supply Voltage
SOT23-6 Package
12鈩?Typical Output Impedance
90% Typical Conversion Efficiency at 40 mA
1碌A(chǔ) Typical Shutdown Current
Applications
n
n
n
n
n
n
Cellular Phones
Pagers
PDAs
Operational Amplifier Power Suppliers
Interface Power Suppliers
Handheld Instruments
Basic Application Circuits
Voltage Doubler
DS100049-1
Splitting V
in
in Half
DS100049-2
漏 1999 National Semiconductor Corporation
DS100049
www.national.com

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