The MAX4880 is an overvoltage-protection controller with an internal current-limited switch that can be configured as a low-cost battery charger. It features overvoltage and undervoltage lockout functions, notifying the processor through a low-level signal. The internal current-limited switch limits the charge current flowing to the battery. It also has a switch control input and a built-in startup delay. The MAX4880 is suitable for applications such as cell phones, digital still cameras, PDAs, and MP3 players.
The MAX4880 is an overvoltage‑protection controller that includes an internal current‑limited switch (525 mA typical) and can be configured as a low‑cost battery charger. When the input voltage exceeds the overvoltage trip level or falls below the undervoltage‑lockout level, the device turns off an external n‑channel MOSFET and asserts fault flags (FLAGV, BAT_OK) to the processor. It also provides a 50 ms startup delay, 15 kV ESD protection on the input, and a shutdown function.
The device is supplied in a 10‑pin TDFN package, operates from –40 °C to +85 °C, and supports an input voltage range of 0.3 V to 28 V. Typical specifications include a 5.6 V overvoltage‑trip level, a 4.35 V undervoltage‑lockout level, and a 525 mA current limit. Application examples include cell phones, digital still cameras, PDAs, and MP3 players.
| Internal Current‑Limited Switch Rating | 525 mA (typ) |
|---|---|
| Package | 10‑pin TDFN (3 mm × 3 mm) |
The internal current‑limited switch is rated for a typical limit of 525 mA.