High voltage step-down controller from AnalogicTech

12th November 2008

Advanced Analogic Technologies Inc., Europe

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Datasheet

AnalogicTech has introduced the AAT1185, a single output, step-down controller capable of providing high efficiency power conversion for lower cost 12V adapters. Fabricated in AnalogicTech’s innovative Modular BCD process, the controller maximizes design versatility by offering both high and low-side pins to drive a wide variety of external N-Channel MOSFETs. Moreover, by supporting both fully synchronous and non-synchronous operation, the device allows designers to develop solutions for such disparate applications as wireless LANs, DSL and cable modems, notebook computers and set-top boxes with a broad range of performance and power efficiency levels.

Given the diversity of 12V adapter applications today, designers need a high degree of flexibility to optimize the solution for their particular system. By providing low and high side pins to drive external MOSFETs instead of embedding the MOSFETs directly into the IC, the AAT1185 controller gives designers the option of building lower-cost, non-synchronous solutions using a Schottky diode on the load side switch or building high efficiency synchronous solutions using any of a wide array of power MOSFETs.

The AAT1185 single output step-down controller supports a wide 6V to 24V input range. Output voltage is adjustable from 0.8 to 5.5V. Output current ranges from <1A up to 10A.
The controller provides high and low-side pins to drive external N-Channel power MOSFETs. Both drive pins are compatible with a wide range of external MOSFETs allowing designers to use the AAT1185 to develop control solutions for both low power and high power configurations.

The AAT1185’s constant frequency voltage mode control allows designers to optimize performance across the entire output voltage and load range. A high 490kHz switching frequency helps designers keep external component size small and efficiency high by supporting the use of a wide range of L/C filtering components. External compensation allows the designer to optimize transient response. Shutdown current is < 30microA.
To ensure device integrity, the AAT1185 features internal soft start, programmable over-current and over-temperature protection circuits.

Qualified across the -40 to +85 degrees C temperature range, the AAT1185 is available in a low cost, Pb-free, 14-pin TSOPJW package.