The LTC4231 ultralow quiescent current (IQ) hot swap controller enables safe board or battery insertion and extraction from 2.7V to 36V systems. The device controls an external N-channel MOSFET to gently power up board capacitors, avoiding sparks, connector damage, and system glitches. Quiescent current is 4 µA during normal operation, dropping to 0.3µA in shutdown mode. To ensure low current operation, the under=voltage and overvoltage resistive dividers are connected to a strobed ground, lowering their average current draw by 50x. Available in 12-pin MSOP and 3 mm x 3 mm QFN packages, pricing starts at $2.25 each/1,000. A datasheet awaits at http://cds.linear.com/docs/en/datasheet/4231f.pdf
Linear Technology Corp.
Milpitas, CA.
800-454-6327
http://www.linear.com
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