Maxim Integrated Switching Regulator, Surface Mount, 12V dc Output Voltage, 2 → 5.5V dc Input Voltage, 45mA

The ultra-small MAX1682/MAX1683 monolithic, CMOS charge-pump voltage doublers accept input voltages ranging from +2.0V to +5.5V. Their high voltage-conversion efficiency (over 98%) and low operating current (110μA for MAX1682) make these devices ideal for both battery-powered and board-level voltage-doubler applications.
Oscillator control circuitry and four power MOSFET switches are included on-chip. The MAX1682 operates at 12kHz, and the MAX1683 operates at 35kHz. A typical application includes generating a 6V supply to power an LCD display in a hand-held PDA. Both parts are available in a 5-pin SOT23 package and can deliver 30mA with a typical voltage drop of 600mV.

5-Pin SOT23 Package
+2.0V to +5.5V Input Voltage Range
98% Voltage-Conversion Efficiency
110μA Quiescent Current (MAX1682)
Requires Only Two Capacitors
Up to 45mA Output Current
Applications
Cell Phones
Handy Terminals
PDAs
Small LCD Panels