Feature: 1. SUPPORT MODES: The boost converter module supports automatic PFM operating mode under light load and pass through mode under VIN>VOUT, meeting the needs of more applications. 2. CIRCUIT GUARD: This voltage regulator supports true disconnection of input and output during shutdown, with output overvoltage and thermal shutdown guard, and output short circuit guard. 3. EXCELLENT CHIP: This step up module uses excellent for TPS61023 chip, which has high thermal efficiency, compact size, and almost integrates all functions, including double 3A MOSFET switches. 4. INPUT AND OUTPUT: Input 2‑5VDC on one side and obtain a power supply of up to 5V 1A on the other side. This voltage converter is compact and practical, greatly improving work efficiency. 5. APPLICABLE SCENES: When you need a large amount of 5V power supply, this boost module can come in handy and is very suitable for battery power projects with 2S or 3S alkaline batteries or a single lithium battery. Specification: Item Type: Boost Module MOSFET: Two 47mΩ (LS), 68mΩ (HS) Peak Switch Current Limit: 3.7A Switching Frequency at VIN > 1.5V: 1MHz, VIN < 1V: 0.5MHz Typical Shutdown Current for Vin and SW: 0.1μAThis boost module uses very small but highly efficient for TPS61023 chip. The chip integrates almost all functions, including dual 3A MOSFET switches. Please note that the switch will not tell you the maximum output, refer to the below 500mA maximum current output at 5V when input is 2.5V DC (2 NiMH rechargeable batteries) 800mA maximum current output at 5V when input is 3V DC (2 alkaline batteries or a close to depleted LiPo) 1400mA maximum current output at 5V when input is 4V DC (3 NiMH, or new polymer lithium) 5.2V 100mA output requires 3.7V 160mA input (88%) 5.2V 250mA output requires 3.7V 400mA input (88%) 5.2V 500mA output requires 3.7V 800mA input (88%) 5.2V 1000mA output requires 3.7V 1800mA input (78%) As you can see, when the lower current is about 500mA or lower, buzz will up about 88%. You can get 1A, but efficiency will drop a bit to 78%.. Package List: 1 x Boost Module 1 x Pin Header