The MAX4987AE/MAX4987BE are overvoltage protection devices with built-in ESD protection for USB data lines. These devices feature a low 100mΩ (typ) RON internal nFET switch and protect low-voltage systems against voltage faults up to +28V. When the input voltage exceeds the overvoltage threshold or decreases below the under-voltage threshold, the internal nFET switch is turned off to prevent damage to the protected components.
All switches feature a minimum 1.5A current-limit protection. During a short-circuit occurrence, the switch operates in an autoretry mode where the internal nFET switch is turned on to check if the fault has been removed. The autoretry interval is 30ms, and if the fault is removed, the nFET switch remains on.
The MAX4987AE/MAX4987BE feature low-capacitance (3pF) ESD protection for USB data lines that allow transmission of high-speed USB 2.0 signals.
The overvoltage threshold (OVLO) is preset to 6.15V. The undervoltage thresholds (UVLO) are preset to 2.55V (MAX4987AE) or 4.2V (MAX4987BE). When the input voltage drops below the undervoltage (UVLO) threshold, the devices enter a low-current standby mode.
All devices are offered in a small 2mm x 3mm, 8-pin TDFN package and operate over the -40°C to +85°C extended temperature range.
Key Features
Applications/Uses
Input Voltage Protection Up to +28V
Integrated Low RON (100mΩ) nFET Switch
Internal Overcurrent Protection 1.5A (min)
Overcurrent Protection (Autoretry)
Enable Input
Internal 30ms Startup Delay
Low-Capacitance USB High-Speed Data Line ESD Protection (3pF)
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