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Multiphase synchronous buck converter

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article image Meets rigorous power specifications.

FAIRCHILD Semiconductor, represented by Arrow Electronics , has announced a VRM/VRD10-compliant power solution for high-performance microprocessors.

The FAN53168, a multi-phase dc-to-dc PWM controller, and the FAN53418, a synchronous MOSFET driver, work together to form a highly accurate, efficient multiphase synchronous buck converter.

This converter meets rigorous VRM/VRD10 power specifications-including tight "loadline" requirements-while reducing system costs and part count.

In a move that dramatically increases the reliability of the supply chain, the FAN53168 and FAN53418 are offered as 100% pin-compatible second sources to the ADP3168 and ADP3418, respectively.

The chipset is currently available in volume production.

To meet the tight VRM/VRD10 loadline, the FAN53168 uses temperature-compensated inductor current sensing--providing tight accuracy at the lowest system cost.

Most competing products use MOSFET RDS(on), or sense resistors to measure current and set the loadline, a solution that is less accurate and more costly.

The FAN53168's architecture combines a highly stable, high-speed control loop with active voltage positioning (droop) to meet CPU load transient requirements while minimising the number of output capacitors and their associated costs.

Additionally, the FAN53168/ FAN53418 chipset allows the regulator to scale to 2, 3, or 4 phases and can provide over 120A output to accommodate future VRM10.x CPUs.

For additional safety and reliability, the controller features "on-the-fly" voltage identification (VID) support, undervoltage, overvoltage crowbar, and short-circuit protection, along with a Power Good output flag.

The FAN53168 is available in a 28-lead TSSOP package and the FAN53418 is available in an 8-lead SOIC package. Both devices are rated for operation from 0ºC to +85ºC.

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