12 December 2011
Power Electronics / Power Management
The AAT2138 from Analogic is a high-current, synchronous step-down converter with an integrated current limited load switch designed for high-precision current control applications. By guarding against excessive input current, the device enables the system designer to maximise the output current from the converter while protecting the input supply. It is designed for protection of USB ports from heavy load transient conditions commonly seen with high data rate modem applications.
The IC integrates a high-precision, programmable current limited p-channel MOSFET load switch to protect the input supply against large currents which may cause the supply to fall out of regulation. The current limit threshold is programmed up to 3 A by an external resistor. The AAT2138 is a 2,8 MHz converter which utilises a tiny 1 μH inductor and internal compensation to ensure a small footprint.
The regulator supports 100% duty cycle operation for dropout conditions. An external clock in the range of 1 MHz to 3 MHz can be fed into the device as a synchronous signal for the step-down regulator. This feature offers the flexibility of fine tuning the switching frequency and optimising performance in the application.
The AAT2138 is available in a lead-free, low profile, 14-pin 3 x 3 mm TDFN package rated over the -40°C to 85°C temperature range.
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