Use of External MOSFETs Supports Both Synchronous and Non-Synchronous Designs
"Given the diversity of 12V adapter applications today, designers need a high degree of flexibility to optimize the solution for their particular system," says CJ Zhang, product line vice president 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 Schottky diode on the load side switch or building high efficiency synchronous solutions using any of a wide array of power MOSFETs."
Up to 10A Output
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 490 kHz 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 < 30 uA.
To ensure device integrity, the AAT1185 features internal soft start, programmable over-current and over-temperature protection circuits.
Price and Availability
Qualified across the -40 degrees C to +85 degrees C temperature range, the AAT1185 is available in a low cost, Pb-free, 14-pin TSOPJW package. The IC sells for $0.79. in 1K quantities.
Advanced Analogic Technologies, Inc. (AnalogicTech) is a supplier of Total Power Management(TM) semiconductor solutions for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, wireless LAN, and personal media players. The company focuses its design and marketing efforts on the application-specific power management needs of consumer, communications, and computing applications in these rapidly evolving devices. AnalogicTech also develops and licenses device, process, package, and application-related technology. AnalogicTech is headquartered in Santa Clara, California and Macau, S.A.R., with offices in China (Beijing, Shanghai and Shenzhen), Hong Kong, Taiwan, Japan, South Korea, Sweden, France and United Kingdom, as well as a worldwide network of sales representatives and distributors. The company is listed on the NASDAQ exchange under the ticker symbol AATI. For more information, please visit the AnalogicTech website: http://www.analogictech.com. (AnalogicTech - G)
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