AnalogicTech has introduced a new family of high-voltage, high-current, non-synchronous step-down converters capable of providing high-efficiency power conversion from 24 V supplies. These new devices offer cost savings for wireless LAN, DSL and cable modem, and set-top box designs by integrating a buck converter with a low-noise low dropout regulator (LDO).
By supporting input voltages up to 24 V and combining a highly efficient nonsynchronous buck converter with an LDO optimised for noise-sensitive applications, this new family of products offers designers of LAN equipment operating off a low-cost 12 V adapter an opportunity to boost efficiency while reducing product footprint.
Operating from an input voltage between 6 V and 24 V, the AAT1189 is targeted at consumer electronics equipment operating from a low cost AC-DC adapter. It delivers up to 2,5 A output current and its 490 kHz switching frequency allows designers to use small filtering components and keep total solution size small. The use of voltage mode control helps optimise performance across the entire load range.
The AAT2687 and AAT2689 combine a high-voltage step-down converter with an LDO regulator. The buck converters on both devices operate off a 6 V to 24 V input and deliver a VOUT of 1,5 V to 5,5 V. The buck converter on the AAT2689 delivers up to 2,5 A, while the one on the AAT2687 supplies up to 4,5 A. The integrated LDO is capable of delivering 600 mA and offers low output noise, low quiescent current and excellent transient response. Separate enable pins allow the designer to independently control the buck converter and the LDO. Shutdown current is less than 15 μA.
All three devices in the product family feature internal soft start, over-temperature protection and adjustable over-current protection. They are qualified across the -40°C to +85°C temperature range. The AAT1189 and AAT2689 are available in a lead-free, 16-pin, 3 x 4 mm TDFN package, while the AAT2687 comes in a lead-free, 24-pin, 4 x 5 mm TQFN package.
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