Check the listing for details. 500mA 3-15V to -5V DC-DC Boost-Buck Inverting switch regulators +/- Voltage. Condition: New. Listed at 3.71 USD. Product Name: 500mA 3-15V to -5V DC-DC Boost-Buck Inverting switch regulators +/- Voltage Converter Module for Arduiuo MCU LCD Amplifier Packing list: 1 PCS 3V-15V TO -5V Boost-Buck Negative voltage Module Description: DC-DC Boost-Buck Inverting switch regulators Module Input voltage DC +3~+15V,output DC -5V(Deviation is ±3%) Maximum input current 500mA Maximum output current : 500mA Quiescent current: 4-10mA DC DC Boost Converter Module working frequency 100kHz. Operating temperature range : 0~+70 Degrees Celsius Storage temperature range : -65~+150 Degrees Celsius 2.54mm pin pitch,for MCU Development Board Breadboard friendly. Size : 23 x 16.3 x 6.3mm Weight :2.9g Applications ADC/DAC/ Operational Amplifier RS232 RS485 RS422 Bus Audio equipment LCD power supply DVD EVD Instrumentation equipment MCU Board Motor Power Instrumentation multimeter Wifi/Router/Ethernet devices Attention : This is a DC-DC voltage converter module,Must be noted when using: 1 Input voltage can not be greater than the maximum input range 2 Output power can not be greater than the maximum load for a long time 3 Input power must be greater than the output power, because the power consumption of the module itself Q & A: Q : Why output voltage is less than the nominal voltage A : Input power supply power is too low.Test the input voltage with a multimeter,a t this time of the input voltage is very low