PMUs Combine Three Step-down DC/DC Converters in a Single Monolithic IC
Advanced Analogic Technologies Inc. announced today two mini-Power Management Units (PMUs) that combine three step-down DC/DC converters in a single monolithic IC. Targeted at portable devices, 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. The devices operate off an input voltage range of 2.7V 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, according to the company. With efficiency levels exceeding 95 percent, the devices help reduce power consumption and extend battery life. Quiescent current is a low 50 µA/channel. Transient response time is typically < 20 µs. Each of the three regulators has an independent enable pin. A 1.8 MHz switching frequency helps minimize the size of external components and reduce PCB footprint. An integrated internal soft start function limits current surge at the input and eliminates output voltage overshoot. Both devices also feature over-temperature and current-limit protection. The AAT2784 and AAT2785 are 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 $1.70 and the AAT2785 sells for $1.84, both in 1,000 quantities.
Advanced Analogic Technologies Inc.
408 737 4600, www.analogictech.com