Power Electronics / Power Management


Low-power load switch

20 January 2010 Power Electronics / Power Management

Advanced Analogic Technologies has introduced the AAT4702, a highly integrated load switch that consumes just 15 μA quiescent current.

Packaged in a compact 8-pin, 2 x 2 mm FTDFN package, the device is a current-limited P-channel MOSFET power switch with an integrated LDO regulator that offers a variety of protection features including auto-restart, reverse current blocking and a fault flag.

The AAT4702’s load switch current limit is set at 150 mA by default, but it is programmable up to 1 A via an external resistor. To further protect system loads or peripheral circuits from over-current conditions, the new load switch adds an auto-restart function that wakes up and re-enables the device every 40 ms to check for the continued existence of an over-current condition. If the over-current condition remains, the device stays in shutdown mode with both the load switch and LDO regulator output pulled low to ground. This allows the device to automatically resume operation once the over-current condition ends, eliminating the risk of damage.

An integrated FAULT flag feature that indicates an over-current or over-temperature condition is also available, adding a 5 ms blanking time to prevent reports of false events. The AAT4702 also adds reverse current blocking to protect the load switch from reverse current potentials when the device is shut down. The integrated load switch/LDO operates from inputs ranging from 2,4 V to 5,5 V. The LDO integrated into the IC delivers a regulated 1,8 V supply voltage with ±2% accuracy at load levels up to 100 mA. It may be powered either directly from an input source supply or via the load switch output. Shutdown current is less than 1 μA.

For more information contact Andrew Dixon, Hi-Q Electronics, +27 (0)11 894 8083, adixon@hi-q.co.za, www.hi-q.co.za



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