VT4055 is a 500mA single-cell lithium-ion battery charger with reverse battery protection, constant current/constant voltage operation, thermal regulation, 4.2V preset charging voltage, charging current monitor output, automatic recharge, 1 open drain charging status output pin, C/10 charging termination, standby mode power supply current of 40uA, 2.9V trickle charging device version, soft start limits surge current.
The VT4055 is a compact, low‑component‑count charger IC designed for portable applications. It supports USB or external power sources and includes internal protection features such as reverse‑battery protection and thermal regulation.
The document provides pin definitions, electrical characteristics, typical application circuits, and recommended component values for constant‑current and constant‑voltage operation, as well as guidelines for PCB layout and thermal management. This manual is written in Chinese.
| Typical charging current | 500 nA |
|---|---|
| Maximum charging current | 500 mA |
| Stand‑by leakage current | 40 µA |
The typical charging current is 500 nA.