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Step-down converters simplify system designs

Posted: 31 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:step-down converters? portable electronics devices?

Advanced Analogic Technologies Inc. has introduced the AAT1112 and AAT1145, 1.5A and 1.2A constant frequency current mode step-down converters. Available in 3mm x 3mm TDFN housing, the current-mode converters require no external compensation components and offer designers highly compact and easy-to-implement solutions.

Many portable electronics devices contain circuitry that must be powered from a 3.3V rail. Unlike comparable voltage-mode step-down converters, the current-mode AAT1112 and AAT1145 enable a Li-ion battery input to a 3.3V output at full rated current. These devices also minimize the size of the entire solution without forcing the system designer to iteratively determine the correct external compensation components.

AnalogicTech's AAT1112 supplies up to 1.5A output current from a 2.4-5.5V input while the AAT1145 supplies up to 1.2A output current from a 2.5-5.5V input. Output voltage can be regulated from 0.6V to VIN. The devices also help extend battery life by running at 100 percent duty cycle for low dropout operation and by offering up to 95 percent power efficiency.

Slope-compensated current mode PWM control enables the use of inductor values as low 1?H; while the high 1.5MHz and 1.4MHz switching frequency enables the use of small external components, resulting in a small total solution.

The AAT1112 and AAT1145 devices offer integrated soft start and short-circuit and thermal fault protection. They also feature a low shutdown current of Rated over the -40C to 85C temperature range, the AAT1112 step-down converter comes in both a Pb-free, 3mm x 3mm, 12-lead TDFN package and Pb-free, 2.75mm x 3mm, 12-lead TSOPJW package. The AAT1145 step-down converter comes in a, 3mm x 3mm, 10-lead TDFN package.

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