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Step-down converters simply feature expansion
( 01 May 2008 )
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• The 3-channel AAT2784 and AAT2785 allow designers to add one 1.5A synchronous step-down converter and two 300 mA synchronous step-down converters or one 1.5A synchronous step-down converter and two 600 mA synchronous step-down converters, respectively, without radically altering their existing core system design or adding numerous discrete devices.
• Designed for portable applications, the AAT2784 and AAT2785 operate off an input voltage range of 2.7 to 5.5V. Outputs are adjustable from 0.6V to VIN. Both devices employ a unique low noise architecture that reduces output ripple by 25 percent and spectral noise by up to 50 percent.
• With efficiency levels exceeding 95 percent, the new devices help reduce power consumption and extend battery life. Quiescent current is a low 50µA/channel. Transient response time is typically <20 µs.
• Each of the three regulators has an independent enable pin. A high 1.8 MHz switching frequency helps minimize the size of external components and reduce PCB footprint.
• Qualified across the -40 C to +85 C temperature range. Both ICs are available in a Pb-free, 16-pin TDFN34 package. The AAT2784 sells for USD1.70 and the AAT2785 sells for USD1.84, both in 1,000 quantities.
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