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High-efficiency step-down controller suits 12V adapters

Posted: 14 Nov 2008 ?? ?Print Version ?Bookmark and Share

Keywords:step-down controller? 12V adapter? power conversion?


Advanced Analogic Technologies Inc. has developed AAT1185, a single output, step-down controller capable of providing high efficiency power conversion for lower cost 12V adapters.

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 Fabricated in AnalogicTech's Modular BCD process, the new controller maximizes design versatility by offering both high and low-side pins to drive a wide variety of external n-channel 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.

Moreover, by supporting both fully synchronous and non-synchronous operation, the new device allows designers to develop solutions for such disparate applications as WLANs, DSL and cable modems, notebook computers and STBs with a broad range of performance and power efficiency levels.

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 To ensure device integrity, the AAT1185 features internal soft start, programmable over-current and over-temperature protection circuits.

"Given the diversity of 12V adapter applications today, designers need a high degree of flexibility to optimize the solution for their particular system," said CJ Zhang, product line VP at AnalogicTech. "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 Schokkty diode on the load side switch or building high efficiency synchronous solutions using any of a wide array of power MOSFETs."

Qualified across the -40C to +85C temperature range, the AAT1185 is available in a low cost, Pb-free, 14-pin TSOPJW package for 79 cents in 1,000 quantities.

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