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Power ICs with step-down converters rev up efficiency

Posted: 01 Aug 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power management IC? step-down converter?

Advanced Analogic Technologies Inc. (AnalogicTech) has launched two new power management ICs for portable applications. Combining two step-down converters with a low Vin low dropout regulator (LDO), the AAT2782 and AAT2783 devices can be used to power both traditional power management functions and noise-sensitive circuits without compromising power efficiency.

The devices extend battery life and reduce board footprint by powering both standard 3.3V circuits and lower voltage-noise sensitive circuits while maintaining high power efficiency, according to AnalogicTech. The step-down converters on both devices offer high efficiency rates. Using the LDO to postregulate the output of the second step-down converter for low-noise operation, both devices achieve efficiency levels up to 80 percent.

The ICs operate off from 2.7V to 5.5V input range and provide three independently regulated DC outputs: two step-down converters and one low input voltage LDO. The two step-down converters on the AAT2782 deliver 1200mA and 600mA, respectively. On the AAT2783, the two step-down converters supply 1000mA and 400mA. On each IC, both converters use current mode control to ensure fast transient response and stable operation across the entire operating range. A 1.3MHz switching frequency supports the use of small external filters.

The low-input voltage LDO on both devices is optimized for low-noise operation. Designed to operate off a 1.7V input, the LDO delivers up to 400mA with a -80dB power supply rejection ratio and 65? ?Vrms output noise with an optional bypass capacitor. The LDO's output voltage is factory set at 1.2V.

Total quiescent current is 170?A for the AAT2782 and 135?A for the AAT2783. Both devices feature 200 ?s internal soft start and overtemperature protection. The devices are qualified across the -40C to +85C temperature range. They are available in a Pb-free, 16-pin, thin dual-in-line flat package.

-Gina Roos

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