Power Electronics / Power Management


Synchronous DC-DC converters

19 August 2009 Power Electronics / Power Management

The new MAX15038 and MAX15039 from Maxim are small, synchronous DC-DC converters that deliver up to 4 A and 6 A of output current, respectively. Operating from a 500 kHz to 2 MHz switching frequency, these devices enable the implementation of compact, all-ceramic-capacitor designs. User-selectable, fixed-frequency PWM and pulse-skipping modes ensure high efficiency during light loads, while integrated low-resistance MOSFETs maximise conversion efficiency at heavy loads. In all, the ICs deliver over 94% conversion efficiency (at 1 MHz), making them suitable for a variety of point-of-load applications, such as those found in telecom, networking, storage and server equipment.

The devices integrate a high-bandwidth (28 MHz) voltage-error amplifier, which can be combined with a voltage-mode control architecture to enable the implementation of type III compensation. This topology maximises bandwidth, improves transient response, and minimises output capacitance, thus allowing an all-ceramic-capacitor design.

The converters operate from a 2,9 to 5,5 V supply and provide ±1% output-voltage accuracy over line, load and temperature variations. Other features include two 3-state inputs to select one of nine preset outputs, an external reference input for tracking applications, programmable soft-start, and the ability to sink and source current at the output for memory applications. Additionally, the output voltage can be adjusted to any value with two external resistors.

For more information contact Larry Gordon, CST Electronics, +27 (0)11 608 0070, sales@cstelectronics.co.za, www.cstelectronics.co.za



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