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Description

FULL DATA SHEET (PDF, 212kB) Download   E-Mail The MAX4880 is an overvoltage-protection controller with an internal current-limited switch that can be configured as a low-cost battery charger. When the input voltage exceeds the overvoltage trip level (5.7V), or drops below the undervoltage-lockout level (4.2V), the MAX4880 turns off the external n-channel MOSFET and asserts an undervoltage/overvoltage flag indicator (FLAGV-bar) low to notify the processor. The MAX4880 internal current-limited switch limits the charge current flowing to the battery to 525mA. The switch opens when the battery voltage reaches its full-charged state (4.2V), and a flag (BAT_OK-bar) asserts to notify the processor. The MAX4880 includes a switchcontrol input (CB) to turn off the internal current-limited switch, regardless of the battery voltage. The MAX4880 also features a built-in startup delay that allows the adapter voltage to settle down before turning on the MOSFET. Other features include 15kV ESD protection for the input and a shutdown function (EN-bar) to turn off the external n-channel MOSFET. The MAX4880 is available in a space-saving 10-pin TDFN package and is specified for operation over the extended -40°C to +85°C temperature range.

Key Features		Applications/Uses
Overvoltage Protection Up to 28V Preset 5.6V Overvoltage Trip Level Internal 525mA Current-Limited Switch ±1.2% Accurate Battery Disconnect (4.2V) Drives Low-Cost n-Channel MOSFET Internal 50ms Startup Delay Overvoltage/Undervoltage-Fault FLAGV-bar Indicator Battery-Voltage-Trip BAT_OK-bar Indicator Undervoltage Lockout Thermal Shutdown Protection Tiny 10-Pin TDFN Package		Cell Phones Digital Still Cameras MP3 Players PDAs and Palmtop Devices

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Typical Operating Circuit

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