LM2665 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – 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 µA (operating efficiency greater than 90%
with most loads) and 1µA typical shutdown current, the
LM2665 provides ideal performance for battery powered
systems. The device is in SOT-23-6 package.
Features
n Doubles or Splits Input Supply Voltage
n SOT23-6 Package
n 12Ω Typical Output Impedance
n 90% 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 Doubler
Splitting V_in in Half
DS100049-1
DS100049-2
© 1999 National Semiconductor Corporation DS100049
www.national.com