DC-DC Converter Step Up Boost 3V-5V 1A USB Charger MP3/MP4 Phone

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Module Properties: non-isolated step-up module (BOOST)

• input voltage: 2.5-6V
• Output voltage: 4-12 V(Adjustable, the default 5 v)
• Output Current: the maximum 1000mA
• Efficiency: Up to 92% (the higher the input voltage, the higher the efficiency)
• Switching frequency: 1MHz
• Output ripple: 20mV (MAX)
• Operating Temperature: Industrial (-40?c to +85?c)
• Voltage regulation: ? 2.5%
• Short circuit protection: None (Please use the lithium battery with protection.)
• Input Reverse Polarity Protection: None
• Connection: Welding
• Input: IN + Postive, IN-Negative
• Output: USB Output  

Applications:
DIY a mobile power supply, only need one battery, you can output 5V voltage for your phone, MP3, MP4, PSP charger, very easy.
In order to power your electronic devices when your device needs 5V power supply, when you only have lithium battery, this module can be directly step-up to 5V, solve your problems.