make 3.7v battery charger

Features: Working temperature – 40~80 Celsius Input voltage range 4.2V~6.5V Output voltage 4.2V-28V adjustable Maximum power 5W 0V activation, 2.9V trickle charging Up to 1A programmable linear charging current For single 3.7V lithium battery, fully charged with 4.2V Constant current/constant voltage charging, with over-temperature protection Soft start limit surge current, with battery reverse connection protection…