1 Features
1• Input Voltage for Voltage Doubler: 2.5 V to 5.5 V
• Voltage Divider Splits Voltage: 1.8 V to 11 V
• Doubles or Splits Input Supply Voltage
• 12-Ω Typical Output Impedance
• 90% Typical Conversion Efficiency at 40 mA
• 1-μA Typical Shutdown Current

2 Applications
• Cellular Phones
• Pagers
• PDAs
• Operational Amplifier Power Suppliers
• Interface Power Suppliers
• Handheld Instruments
• Fire Detection and Notification
• Industrial Handheld Radios
• Blood Pressure Monitors

3 Description
The LM2665 CMOS charge-pump voltage converter
operates as a voltage doubler for an input voltage in
the range of 2.5 V to 5.5 V. 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 1.8 V to 11 V in half.
The LM2665 operates at 160-kHz oscillator frequency
to reduce output resistance and voltage ripple. With
an operating current of only 650 μA (operating
efficiency greater than 90% with most loads) and
1-μA typical shutdown current, the LM2665 provides
ideal performance for battery powered systems.