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DC/DC converters target cellphones

Posted: 27 Jan 2006 ?? ?Print Version ?Bookmark and Share

Keywords:AAT1146? AAT2512? DC/DC converters? AnalogicTech? Advanced Analogic Technologies?

Advanced Analogic Technologies Inc. (AnalogicTech), a developer of power management semiconductors for mobile consumer electronic devices, introduced two new DC/DC converters for portable systems powered by single-cell Li-ion/polymer batteries. Designed for fast transient response, the AAT1146 and AAT2512 step-down converters are suited for GSM cellphone applications.

"The power supply supporting a GSM phone baseband chipset must almost instantaneously ramp from a few milliamps to full load, so extremely fast transient response is critical," said David Brown, senior manager of applications engineering for AnalogicTech. "The devices allow design engineers to easily meet these requirements, while keeping the converter output in regulation."

The AAT1146 step-down converter supports an input voltage range of 2.7V to 5.5V and output levels as low as 0.6V. The device delivers up to 400mA of load current and maintains a no-load quiescent current of 27A.

The AAT2512 is a dual-channel synchronous buck converter operating over the same 2.7V to 5.5V input range. Each regulator features independent input and enable pins. Each channel delivers 400mA of load current, and the device supports quiescent current levels of 2727A for light load conditions.

Both converters are available in fixed or programmable versions with efficiency as high as 98 percent. The devices use a 1.4MHz typical switching frequency to minimize the size of external components and keep switching losses low. They feature internal soft-start to eliminate output voltage overshoot, and integrated over-temperature and current limit protection. The two devices also add 100 percent duty cycle low-dropout operation.

The AAT1146 and AAT2512 are rated across the -40C to 85C temperature range. The AAT1146 is available in a Pb-free, compact 2-by-2.1mm SC70JW-8 package and is priced at 87 cents. The AAT2512 is offered in a Pb-free, TDFN33-12 package and is available for $1.64. Both pricing are for 1,000-unit orders.

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