The VM7205 is a circuit specially designed for high-precision linear lithium battery chargers, which is very suitable for those low-cost and portable chargers. It integrates high-precision pre-charging, constant current charging, constant voltage charging, battery state detection, temperature monitoring, charging end low leakage, charging state indication, battery internal resistance compensation and other functions, which are widely used in PDA, mobile phone, handheld devices and other fields.
The VM7205 is a dedicated controller IC for high‑accuracy linear lithium‑ion/polymer battery chargers. It integrates pre‑charge, constant‑current, constant‑voltage charging, battery‑status detection, temperature monitoring, low‑leakage end‑of‑charge detection, charge‑status LEDs, and internal battery‑impedance compensation. The device is suited for low‑cost, portable chargers used in PDAs, mobile phones, and handheld equipment.
The document provides detailed pin definitions, electrical limits, recommended component values, PCB layout tips, and package dimensions for both SOP‑8 and MSOP‑8 versions. Application sections show how to set pre‑charge current, adjust charging current, and implement temperature‑based charge pause using the TS pin. This manual is written in Chinese.
| Supply voltage (VCC) | ‑0.3 V to +18 V |
|---|---|
| Operating temperature (TA) | ‑40 °C to +85 °C |
| Package options | SOP‑8 (VM7205CF) or MSOP‑8 (VM7205DF) |
| DRIVE pin pull‑up resistance | 5 kΩ (VBAT = 4.5 V) |
VMIN is typically around 3 V; the datasheet lists 2.94 V – 3.06 V.
Temperature is monitored via the TS pin, which must see a voltage between VTS1 and VTS2.