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Step-down regulator packs internal boost switch

Posted: 24 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:step-down regulator? switch? MOSFET?

From Maxim Integrated Products comes the MAX17083 low-voltage, step-down regulator with an internal boost switch.

Designed for space-constrained applications, the device integrates dual n-channel MOSFET power switches in a small, 16mm2 TQFN package. Easily supporting a continuous load current up to 5A, the internal 25m?, low-side power MOSFETs ensure high efficiency while reducing component count. For further space and cost savings, the MAX17803 eliminates the need for external Schottky diodes, as well as an external boost diode. The regulator is suitable for ultramobile PCs, netbooks, portable gaming devices, and other low-power, compact applications.

The MAX17803 uses a current-mode, fixed-frequency control scheme to provide an easy-to-implement architecture that does not sacrifice transient response. This architecture also provides peak-current-limit protection and operates in pulse-skipping mode to maintain high efficiency under light-load conditions.

In addition, the step-down regulator produces an adjustable 0.75V to 2.7V output voltage from the system's 3.3V or 5V input supply. It is available in a space-saving, 4mm x 4mm, 24-pin TQFN package, and is fully specified over the -40C to +85C extended temperature range. Prices start at $2.75 (1,000-up, FOB USA). An evaluation kit with recommended external components is available to reduce design time.





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