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Overvoltage protection switch guards portable apps

Posted: 09 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:overvoltage protection devices? switch? MOSFET?

Advanced Analogic Technologies Inc. (AnalogicTech) is offering the first in a family of overvoltage protection (OVP) devices for portable applications.

The AAT4684 switch protects low-voltage systems against high-voltage spikes up to 28V from a power line surge or using the wrong charger while offering a low Rds(on) of 100m typical at 4.5V.

The OVP protection IC uses a P-channel MOSFET power switch to break the connection between the charger adapter and the battery charger when the input voltage exceeds a preset level. Designers can use the device with either an internally programmed overvoltage trip point or an adjustable protection threshold programmed by two external resistors. OVP response is 1?s maximum.

AAT4684 features an undervoltage lockout (UVLO) protection circuit which places the device into sleep mode at input voltages consuming Qualified across the -40C to 85C temperature range, the AAT4684 is available in a Pb-free, 12-pin TSOPJW package.

- Ismini Scouras

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