Archive : 29 November 2007 год

AnalogicTech has introduced the AAT2504, an adjustable 3-channel regulator that combines a step-down converter with two low dropout linear regulators (LDOs). By offering a switching regulator and two LDOs on a single IC, the AAT2504 sub-PMU allows designers to add functionality to established platforms, such as Bluetooth capability to a Personal Navigation Device (PND) or HD radio capability to an MP3 player, and still take advantage of the cost, footprint and power savings of an integrated approach. The step-down converter delivers up to 800mA of output current and supports an input range of 2.7V to 5.5V. A 2MHz switching frequency helps minimise the size of external components. Efficiency exceeds 95%.

 By tying the MODE/SYNC pin high, designers can enable an optional PWM-only operation that maintains constant frequency and low output ripple across all load conditions. Also the converter can be synchronized to an external clock via the MODE/SYNC pin. The two LDOs on the AAT2504 operate across an input range of 1.8V to 5.5V, making them ideal for post-regulating from the step-down converter. Each LDO has an independent input and delivers up to 300mA. Through an external feedback pin, designers can program each LDO’s output voltage from 0.6V to 3.6V. A Power OK (POK) function provides an open drain output signal when LDOA is within regulation. The AAT2504 features a low 80microA typical no-load quiescent current when all three regulators are on. The device also features under-voltage lockout and over-temperature protection. Qualified across the -40 C to +85 C temperature range, the AAT2504 is available in a Pb-free, 20-pin, QFN34 package.

Seiko Epson announced a module enabling non-contact power transmission. The product is made up of a power transmission module (primary module: S4E16402) and a power receiving module (secondary module: SE16403). Using these two elements as a set enables transmission of up to 0.5 W (5 V/100 mA). The thin, flat coil used for power transmission results in a compact design, with the secondary module having an overall thickness of just 2.3 mm. Electromagnetic shielding fitted to the back of the transmission surface in each module reduces interference with other electronic components contained within the same device. The module enables customers to incorporate advanced safety measures for noncontact power transmission into their designs, with built-in safety features including metal detection, secondary detection and automatic cut-off in the event of excess current or abnormal temperature. The 0.5 W output unit outlined above is the first in an array of module products of varying output levels that Epson plans to produce using its newly-developed non-contact power transmission technology, enabling the company to continue meeting diverse customer needs.