Description: _x000D_ This DC-DC converter module is a buck (step-down) converter combined with a boost (step-up) converter, of which output voltage can be lower or higher than the input. It features small size, high power, high efficiency and stable performance. It would maintain output voltage stability when input voltage is higher, lower than output voltage. _x000D_ _x000D_ _x000D_ Features: _x000D_ This boost/buck module can step up or step down voltage and maintain a stable output voltage. _x000D_ It supports input over-current protection, input under-voltage protection and MOS input anti-reverse protection._x000D_ _x000D_ It has quite low output ripple voltage, for example, 20mV when output is 12V 3A, which is great for powering speaker, audio amplifier, artificial circuit, etc. _x000D_ Input 5V to 30V and it can charge storage battery, lithium battery, AA rechargeable battery, or adjust constant current LED brightness. _x000D_ Red&blue light on when constant current charging, blue light on only when constant voltage charging, blue&green light on when almost fully charged, green light on only when fully charged. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Input Voltage: 5V~30V _x000D_ Output Voltage: 0.5V~30V _x000D_ Output Current: 3A (or 4A if enhance heat dissipation)_x000D_ Output Power: 35W (or 60W if enhance heat dissipation)_x000D_ Output Ripple Voltage: 20mV (at 12V 3A output)_x000D_ Conversion Efficiency: 87~91%(step up); 87~89%(step down) _x000D_ Input Over-current Protection: 10A fuse _x000D_ Input Anti-reverse Protection: High efficiency MOS _x000D_ Input Under-voltage Protection: Yes_x000D_ Output Over-current Protection: Yes_x000D_ Frequency: 180kHz_x000D_ Size: 69*28*21mm / 2.71*1.1*0.82" _x000D_ _x000D_ _x000D_ Package Includes: _x000D_ 1 x Module