Step-down converter enables smallest solution size

7 February 2007 Power Electronics / Power Management

Developed with space-constrained portable applications in mind, AnalogicTech's AAT1149 high performance, fast transient, 400 mA step-down converter allows the use of 1 mm high inductors in the industry's latest 0603 footprint, enabling small total solution sizes.

Developers of mobile handsets and modules for new smartphone applications, such as digital media broadcast (DMB) and digital video broadcast (DVB), strive to drive down system thickness and footprint. By enabling the use of small, low profile inductors, and coming in a small, 2,0 x 2,1 mm SC70JW package, the AAT1149 delivers the power these applications need while setting new standards in solution size and power efficiency.

The AAT1149 delivers 400 mA of load current from an input range of 2,7 V to 5,5 V. Output voltage is programmable via external feedback resistors from 1,0 V to VIN. The step-down converter achieves up to a high 98% efficiency. No-load quiescent current is only 45 μA. The 3 MHz switching frequency allows the use of extremely small external components and keeps switching losses low.

The device is current limit and over-temperature protected. An integrated 70 μs soft start feature limits current surge. It is specified for use over -40 to 85°C.

For more information contact Hi-Q Electronics, +27 (0)11 894 8083.

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