The PS3120A is a low noise switched capacitor voltage doubler. It produces a regulated output voltage from a 2.7V to 4.5V input. Low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make the PS3120A ideally suited for small, battery-powered applications.
      The PS3120A have thermal shutdown capability and can survive a continuous short circuit from VOUT to GND. A low current
shutdown feature disconnects the load from VIN and reduces quiescent current to <1μA.
      The PS3120A is available in the industry standard SOT-23-6L power packages 

Features:
 Fixed 4.94V±3% Output
 VIN Range: 2.7V to 4.5V
 Output Current: Up to 110mA (VIN≥3V) Up to 230mA (VIN≥3.6V)
 Low Noise Constant Frequency (360kHz) Operation
 Shutdown Current <1μA
 No Inductors
 Available in Low Profile 6-Lead SOT23 Package