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Blog
Wednesday, November 7, 2007
Advanced Analogic Technologies AAT4684: Overvoltage-protection switch shields against USB hot swaps and high-voltage spikes
Nov 7 2007 1:16PM | Permalink | Email this | Comments (0) |
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Offering a typical 100-mΩ on-resistance at 4.5V, the AAT4684 overvoltage-protection switch protects low-voltage, battery-operated consumer devices against USB hot swaps, 28V spikes from a power-line surge, or damage caused by using the wrong charger. A P-channel MOSFET power switch breaks the connection between the charger adapter and the battery charger when the input voltage exceeds a preset level. Suiting use with an internally programmed overvoltage trip point or an adjustable protection threshold programmed by two external resistors, the protection device uses the vendor’s ModularBCD process technology. Features include a 30-μA typical quiescent current, a 1-μsec maximum response time, and an undervoltage-lockout-protection circuit, placing the device into sleep mode using less than 1-μA input voltages. Available in a lead-free TSOPJW-12 package with a –40 to +85°C temperature range, the AAT4684 OVP device costs 61 cents.
Advanced Analogic Technologies, www.analogictech.com
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