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MAX4884：Overvoltage Protection Controllers with Current Limit in TDFN

Overvoltage trip level, saves space

The MAX4881–MAX4884 overvoltage protection (OVP) controllers with built-in current-limited switch, protect low voltage systems against voltages of up to 28V. When the input voltage exceeds the overvoltage trip level of 5.6V (MAX4881/MAX4883) or 4.5V (MAX4882/MAX4884), the external n-channel MOSFET is turned off to prevent damage to the protected components. An undervoltage/overvoltage flag indicator (OV-bar) notifies the processor that an undervoltage/overvoltage fault condition is present. The MAX4881/MAX4882 feature an internal 1.1A current-limited switch, while the MAX4883B/MAX4883C/MAX4884B/MAX4884C include an internal 0.7A current-limited switch. When the load current is at the current limit for longer than the blanking time, the switch of the MAX4881/MAX4882/MAX4883B/MAX4884B latches off and does not turn back on until Active-Low EN, CB, or IN is cycled. A current-limit flag (Active-Low FLAGI) asserts to indicate a current fault condition. The MAX4883C/MAX4884C limit the current to 0.7A indefinitely until the thermal protection trips. An overcurrent flag output asserts to indicate a current fault condition after the blanking time has elapsed. The MAX4881–MAX4884 have a control input (CB) that is used to turn on and off the internal current-limited switch. Other features include a shutdown function (Active-Low EN) to disable the external n-channel MOSFET, and a built-in startup delay to allow the adapter voltage to settle down before turning on the MOSFET. The MAX4881–MAX4884 is offered 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 Overvoltage Protection Up to 28V Preset Overvoltage Trip Level 5.6V (MAX4881/MAX4883) 4.5V (MAX4882/MAX4884) Internal Current-Limited Switch 1.1A (MAX4881/MAX4882) 0.7A (MAX4883/MAX4884) Drives Low-Cost n-Channel MOSFET Internal 50ms Startup Delay Overvoltage Fault Active-Low OV Indicator Current-Limit Fault Active-Low FLAGI Indicator Undervoltage Lockout Thermal Shutdown Protection Tiny 10-Pin TDFN Package

MAX4881, MAX4882, MAX4883, MAX4884, MAX4893B: Typical Operating Circuit Block Diagram Applications/Uses Cell Phones Digital Still Cameras MP3 Players PDAs and Palmtop Devices

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