AnalogicTech, AAT2505

Step-down converter has fast transient response to meet strict GSM specs

News Release from: Advanced Analogic Technologies Inc., Europe
27/06/2006

The power supply supporting a GSM handset baseband chipset must wake up to full load within microseconds. By integrating a fast transient 600mA step-down converter and a 300mA LDO, AnalogicTech's AAT2505 forms a complete high-performance power supply solution for GSM handset baseband core and I/O.

Additionally, the AAT2505 consumes 50% less PCB area than discrete solutions, and avoids the arduous PCB layout overhead associated with ‘mega’ power management units. The latest addition to the AnalogicTech’s growing SystemPower? family of power management IC products, the AAT2505 offers a highly compact solution that is optimised for popular GSM mobile phone applications.

Low RDS(ON) integrated power switches on the AAT2505 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 27µA no load quiescent current. Its 1.4MHz switching frequency helps minimise the size and cost of external components. Turn-on time is 150µs (typical).
The LDO delivers up to 300mA of current and features an independent input pin. Optimised 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 -40 to +85 degrees C temperature range, the AAT2505 is immediately available in a Pb-free, 12-pin TDFN33 package.