Features Durable Material: Using high-quality electronic components, precision craftsmanship to ensure durability, The step down regulator adopts synchronous rectification scheme to provide wide voltage range, large current and high efficiency. Application: This is a buck voltage converter module with multiple protection methods, over temperature shutdown, under voltage lockout (UVLO), BS voltage protection and short circuit protection. Working Voltage: The working frequency of the DC-DC step-down converter module is 900KHz. The efficiency is 76-92%, which meets most equipment needs. Easy to Use: This buck voltage regulator is user-friendly, accompany with DC interface and connecting terminals, make it easier to be connected to different devices. Beautiful Design:Double panel design, beautiful and generous layout,Two pin holes are specially designed, which can be directly fixed on the hole-board for expansion experiment. Description: 3.7V :  Input voltage 4.5~27V,output 3.7V Maximum output current 2.5A,Short time maximum output current 3.5A DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . Quiescent current: about 250uA Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. 5V : Input voltage 6.5~27V,output 5V Maximum output current 2.5A,Short time maximum output current 3.5A DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . Quiescent current: about 250uA Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. 9V : Input voltage 11~27V,output 9V Maximum output current 2.3A,Short time maximum output current 3A DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . Quiescent current: about 250uA Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. 12V :  Input voltage 13~27V,output 12V Maximum output current 2A,Short time maximum output current 3A DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . Quiescent current: about 250uA Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. Specification: Type:Step-down power supply module Voltage: 3.7v, 5v,9v,12v(Optional)Operating Temperature : -20°C to +85°C Size: 25*15*6.3mm/0.98*0.59*0.25in Weight: Approx.2.4g/0.1oz Package list: 1 x Step-down power supply module Package List