AnalogicTech has introduced a family of high voltage, high current, non-synchronous step-down converters capable of providing power conversion from 24V supplies. These 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 24V and combining a highly efficient non-synchronous buck converter with an LDO optimized for noise-sensitive applications, this family offers designers of LAN equipment operating off a low-cost 12V adapter an opportunity to boost efficiency while reducing product footprint.

Operating from an input voltage between 6.0V and 24V, the AAT1189 step-down converter is targeted at consumer electronics equipment operating from a low cost AC/DC adapter. It delivers up to 2.5A output current. A 490kHz switching frequency allows designers to use smaller filtering components and keep total solution size small. The AAT2687 and AAT2689 combine a high voltage step-down converter with a low input voltage low dropout (LDO) regulator. The buck converters on both devices operate off a 6V to 24V input and deliver a VOUT of 1.5V to 5.5V. The buck converter on the AAT2689 delivers up to 2.5A. On the AAT2687 the buck converter supplies up to 4.5A. The AAT2687 and AAT2689 devices feature an LDO capable of delivering 600mA. Shutdown current is <15 microA.

All three devices in the product family feature internal soft start, over-temperature protection and adjustable over-current protection. The entire product family is qualified across the -40 C to +85degrees C temperature range. The AAT1189 is available in a Pb-free, 16-pin, 3x4-mm TDFN package. The AAT2689 is also available in a Pb-free, 16-pin 3x4-mm TDFN package. The AAT2687 comes in a Pb-free, 24-pin, 4 x 5-mm TQFN package.