Specification: Name: step-down module Model: XL1509 Input voltage: 4.5V~40V Output voltage:1.27~37V Output current : 2A (max) Wave output : <30mV Switch frequency: 150kHz Working temperature : -45℃ ~+85℃ Size: 21mm*17mm *4mm The conversion efficiency of 96 (max.) Application: DIY mobile power supply, communication equipment power supply, all kinds of volume an d weight have strict requirements of the occasion (such as aviation model, etc.).