Power Electronics

Dual-phase, PWM Controller Powers AMD Processors

From Maxim Integrated Products, the MAX8760 is a dual-phase, Quick-PWM, step-down controller for AMD 9G and AMD Hammer CPU core supplies. Dual 180 degree out-of-phase operation reduces input-ripple current requirements and output voltage ripple, thereby reducing the requirements for output and input capacitors and saving cost. Active voltage positioning with adjustable gain and offset reduces power dissipation and bulk output-capacitance requirements.

The MAX8760 is intended for two different, notebook CPU core applications: stepping down the battery directly or stepping down the 5-V system supply to create the core voltage. The single-stage conversion method allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, 2-stage conversion (stepping down the 5-V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size.

The MAX8760 features soft-start, power-up sequencing, soft-shutdown, and independent four-level logic inputs for setting the suspend voltage. The switching regulator also includes output undervoltage protection, selectable overvoltage protection, thermal protection, and voltage regulator power-OK output. When any of these protection features detect a fault, the controller shuts down.

The MAX8760 is available in a low-profile, 6-mm × 6-mm, 40-pin thin QFN package. Prices start at $6.63 in quantities of 1000.

For more information, visit www.maxim-ic.com.

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