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Switching regulators deliver high efficiency, low noise for mobile devices

Sunnyvale, Calif. — Advanced Analogic Technologies Inc. (AnalogicTech) has introduced the first in a family of switching regulators designed for low-noise operation. The company claims the AAT2120 and AAT2158 synchronous step-down converters are the industry's first low-noise switching regulators for mobile devices. Based on a new architecture, the converters are said to deliver significantly lower spectral noise and output ripple than competing switching regulators.

Targeting noise-sensitive systems such as mobile phones, media players and Bluetooth accessories that require higher efficiency regulators to maximize battery life, the AAT2120 supplies up to 500 mA output current, while the AAT2158 delivers up to 1.5 A output for applications requiring higher levels of power. Both devices operate from an input range of 2.7 to 5.5 V and support output voltages as low as 0.6 V.

At lower currents, the AAT2120 and AAT2158 switching regulators are said to produce half the ringing amplitude of competing switching regulators. This characteristic translates directly into lower noise being injected into the system. In system tests, spurious energy injected by the switching regulators was reduced by 3 dB, and at higher currents, the two converters produce approximately 25% less output ripple, said AnalogicTech. By reducing injected noise and output ripple, these two devices can improve the dynamic range performance of RF systems when compared to RF systems powered by traditional switching regulators, added the company.

The AAT2120 and AAT2158 devices also offer all the traditional power efficiency advantages of traditional switching regulators. Power efficiency for the AAT2120 and AAT2158 reach up to 96% and 95%, respectively. In addition, by operating at high switching frequencies, both devices minimize the size of external components.

Both step-down converters offer internal soft-start, over-temperature and current limit protection. The converters also extend system run time by adding 100% duty cycle low-dropout operation. The devices are qualified across the -40°C to 85°C temperature range.

Pricing: The AAT2120 (PB-free, 8-pin, 2 x 2-mm STDFN) is priced at $0.85 in quantities of 1,000. The AAT2158 (Pb-free, 16-pin, 3 x 3-mm QFN) is priced at $1.55 in quantities of 1,000.
Product information: AAT2120

Advanced Analogic Technologies Inc. , 1-4-8-737-4600, www.analogictech.com

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