General Description

The MAX4959/MAX4960 overvoltage protection controllers protect low-voltage systems against high-voltage faults of up to +28V. When the input voltage exceeds the overvoltage lockout (OVLO) threshold, these devices turn off an external pFET to prevent damage to the protected components. The undervoltage lockout (UVLO) threshold holds the external pFET off until the input voltage rises to the correct level. An additional safety feature latches off the pFET when an incorrect low-power adapter is plugged in.

Features

♦ Overvoltage Protection Up to +28V

♦ ± 2.5% Accurate Externally Adjustable OVLO/UVLO Thresholds

♦ Battery Switchover pFET Control

♦ Protection Against Incorrect Power Adapter

♦ Low (100µA Typ) Supply Current

♦ 25ms Input Debounce Timer

♦ 25ms Blanking Time

♦ 10-Pin (2mm x 2mm) µDFN and 10-Pin µMAX Packages

Applications

Notebooks

Laptops

Camcorders

Ultra-Mobile PCs