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Maxim PWM controller delivers 60A output

Posted: 02 Aug 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max5037? dual phase controller? pwm controller? dc/dc controller?

Targeted for integration into high-output current and compact power supplies, the MAX5037 dual-phase dc/dc controller from Maxim Integrated Products dissipates 2W and delivers up to 60A of output current. It also features a set of integrated 4A MOSFET drivers and an internal voltage regulator to allow operation from a 5V, 12V, or 24V power bus.

The chips features an average current-mode control scheme that allows designers to achieve current-limit as well current-sharing accuracy of 15 percent. The company claims that this allows the use of small inductors and fewer external MOSFETs, thus reducing power-supply size and cost.

In addition, a 1800 out-of-phase operation reduces input capacitance requirements, further reducing power-supply size and cost.

The 15 percent accurate internal oscillator frequency is pin-selectable at 250kHz or 500kHz per phase, which results in 500kHz or 1MHz effective switching frequency at the output. The IC also has an on-board 5-bit DAC compliant with Intel's VRM 9.0 specifications, offering VID programmable outputs with 10.8 percent accuracy over the rated operating temperature range.

The MAX5037 also offers an active adaptive voltage-positioning circuit to provide improved load-transient response and maximize efficiency (up to 93 percent) by reducing power loss in the high-current PCB traces.

Safety features include overvoltage protection, which latches off the top MOSFET and latches on the bottom MOSFET in case of an output overvoltage condition. Thermal shutdown and a phase failure detector are also included to warn the microprocessor of impending power-supply failure in the event that one of the phases fails.

Other features include external frequency synchronization, phase-shifted clock output, true differential remote output-voltage sensing, and power-good output.

The MAX5037 operates in the -400C to 850C temperature range and is available in a 44-pin MQFP or 44-pin QFN package. A 52A VRM 9.0 module evaluation kit is available. Prices start at $2.66 in 1,000 unit quantities.

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