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DC/DC converter claims 'very low' quiescent current

Posted: 17 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? consumer electronics? low quiescent current?


Many applications, even in non-battery powered systems, spend the majority of their life in a standby mode consuming only milliamps or microamps of current from their power supply. The AAT1162 DC/DC converter from Advanced Analogic Technologies Inc. (AnalogicTech) offers extremely low quiescent current that significantly lowers the system's total standby mode current consumption, thus improving total power efficiency and enabling designers to more easily achieve green certifications.

AAT1162 is the first in a family of synchronous step-down DC/DC converters designed to operate from a 12V input and deliver up to 1.5A to 5V or lower outputs. Consuming an extremely low 115?A quiescent current, the converter reduces power usage for a wide range of 12V industrial applications as well as higher powered portable systems operating from dual-cell Li-ion/polymer batteries.

The 12V step-down converter operates across an input range of 4V to 13.2V and delivers up to 1.5A of current. Output voltage is fixed or adjustable from 0.6V to Vin. Efficiency levels range up to 96 percent. A combined PWM/light load mode helps maximize efficiency over the entire load range. Operating at a high 800kHz switching frequency, AAT1162 uses relatively small external components, hence minimizing total solution size.

Soft start control limits input surge current and eliminates output voltage overshoot at startup. The device also features current limit and overtemperature protection.

AAT1162 is manufactured in AnalogicTech's ModularBCD process technology. Unlike aging linear-IC legacy fabs or generic digital CMOS foundries, the ModularBCD process represents the first of a new generation of analog, power and mixed-signal IC technologies especially created for high-tech wafer fabrication and optimized for manufacture in ex-DRAM fabs.

The new process makes single-chip, mixed-signal and system ICs both more technically and economically feasible by monolithically integrating fully-isolated CMOS at 3V, 5V and 12V with high-speed complementary bipolar transistors and robust 30V DMOS power devices without resorting to highly complex and expensive techniques such as epitaxy or high-temperature diffusion. As a result, devices manufactured in ModularBCD offer higher efficiency, smaller size and higher levels of integration than devices fabricated in traditional processes. Moreover, they can better manage power and extend battery life in various mobile consumer electronics products such as cellphones, portable media players, tablet and laptop computers and digital cameras.

AAT1162 is qualified across the -40C to 85C temperature range and comes in a Pb-free, 16-pin, 3mm x 4mm TDFN package.

- Henri Arnold
EE Times Europe

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