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.