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Power IC targets GSM mobile apps

Posted: 23 Jun 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Advanced Analogic? AnalogicTech? AAT2505? SystemPower? step-down converter?

Advanced Analogic Technologies Inc. (AnalogicTech) has unveiled the AAT2505, the latest addition to the company's growing SystemPower family of power management IC products. Combining a fast transient 600mA step-down converter with a fast transient 300mA low dropout (LDO) linear regulator, the company said the new device offers a compact solution designed for GSM mobile phone applications.

"The power supply supporting a GSM handset baseband chipset must wake up to full load within microseconds," said Bill Weiss, product line director for AnalogicTech. "By integrating a fast transient 600mA step-down converter and a 300mA LDO, the AAT2505 forms a complete high-performance power supply solution for GSM handset baseband core and I/O. In addition, the AAT2505 consumes 50 percent less PCB area than discrete solutions, and avoids the arduous PCB layout overhead associated with 'mega' power management units."

Low RDS(ON) integrated power switches on the new step-down converter extend battery life and handset talk time by supporting efficiency levels up to 98 percent. With a wide output voltage range of 0.6V to VIN, the 600mA converter also maintains a low 27A no load quiescent current. Its 1.4MHz switching frequency helps minimize the size and cost of external components. Turn-on time is 150s (typical).

The LDO delivers up to 300mA of current and features an independent input pin. Optimized to support the fast line/load transient requirements of a GSM chipset, the LDO features low quiescent current and a power-OK (POK) output to signal when the output voltage is in regulation.

The AAT2505 also adds internal soft-start, over-temperature, and current limit protection.

Specified over the -400C to 850C temperature range, the AAT2505 is immediately available in a Pb-free, 12-pin TDFN33 package. The device sells for $1.14 each in 1,000-piece quantities.

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