AX5070-Low Input Voltage Step-up Converter with Low Quiescent Current DataSheet 

GENERAL DESCRIPTION
   The AX5070 family devices provide a power- supply solution for products powered by
either a single, two or three-cell Alkaline, NiCd or NiMH, or one-cell Li-Ion or Li-polymer
battery. Available output current depends on the input-to-output voltage ratio. The step-up
converter is based on current–mode pulse-width-modulation (PWM) control using
synchronous rectification to obtain maximum efficiency with the minimum quiescent current.
The output voltage is programmable using an external resistor divider, The converter can
be switched off to minimize battery drain in shutdown. In shutdown, the AX5070 connects
the battery input to the output, allowing the input battery to be used as a backup or realtime clock supply when the converter is off. The devices are offered in a small 6-pin
SOT23-6 package.

FEATURES
- Up to 92% Efficiency
- 12µA Quiescent Current
- Startup with 0.9V Minimum Input Voltage
- Operating Input Voltage from 0.9V to 5V
- Maximum Switch Current 450mA
- VOUT Pulled to VIN in Shutdown
- Adjustable Output Voltage from 2.5V to 5.5V
- Input Under-voltage Lockout
- Pb-Free (ROHS compliant)
- Small 6-pin SOT23_6L Package
- RoHS and Halogen free compliance.

Applications
- Battery Powered Applications:
- 1 to 3 Cell Alkaline, NiCd or NiMH
- 1 cell Li-lon
- Solar or Fuel Cell Powered Applications
- Consumer and Portable Medical Products
- Personal Care Products