Features Output Voltage: The output voltage of this converter module is optional, 3.7V, 5V, 12V. 1 MHz Working Frequency: This is a DC-DC boost converter module with working frequency of 1 MHz. High Efficiency The voltage step up module has high efficiency up to 95%, usually can be 76%~93%. Easy to Use: The mini DC-DC boost converter board has ultra small size and light weight, it is convenient to use. Wide Application: The step up voltage converter module is widely used for battery-powered devices, multimeter, small power motors, cameras, electric toys, model aircraft, LED lighting, electronic DIY kits, etc. Specification: Output voltage:3.7V, 5V, 12V  (Optional) Efficiency: 94% (usually is 84%-91%) Quiescent current: 0.19mA Operating temperature range : -40~+85 Degrees Celsius Storage temperature range : -65~+150 Degrees Celsius Size: 13*11*5.2mm / 0.5*0.4*0.2in Weight: 2g / 0.1oz (approx.) Protection : Over current protection(OCP) Over voltage protection(OVP) Short circuit protection(SCP) Over temperature protection(OTP) Pin description: Vi       : Input positive(+) GND  : Input and Output negative(GND/-) Vo      : Output positive(+)   Output 3.7V : Input voltage: DC 2.6 - 3.6V Output voltage: DC 3.7V±3% Maximum output : 3.7V/1200MA(See the table below for details)  Output 5V : Input voltage: DC 2.6 ~ 4.5V Output voltage: DC 5V±3% Maximum output : 5V/1200MA   Output 12V : Input voltage: DC 2.6 ~ 6V Output voltage: DC 12V±3% Maximum output : 12V/500MA Package list: 1 * Module Note: Please pay attention when using: 1, The input voltage should not be higher than maximum input range. 2, The output power cannot be higher than the maximum load for a long time. 3, The input power must be higher than output power, because of the power consumption of the module itself. FAQ: Q: Why the output voltage is lower than the nominal voltage? A :Because the input power is too low.Use a multimeter to test the input voltage, the input voltage is very low at this time. Package List