General Description

The MAX8775 is a dual, step-down, interleaved, fixed frequency, switch-mode power-supply (SMPS) controller with synchronous rectification. It is intended for GPU cores and I/O power generation in battery-powered systems. Flexible configuration allows the MAX8775 to operate as two independent single-phase regulators, or as one high-current two-phase regulator.

Configured in separate mode, the MAX8775 provides power to two dynamic voltage rails, one for the GPU core and the other for the I/O power rail. Configured in combined mode, the MAX8775 functions as a two phase, high-current, single-output GPU core regulator, powering the high-performance GPU engines used in gaming machines and media center notebooks.

Features

♦ Dual-Output, Fixed-Frequency, Current-Mode Control

♦ Combinable Output for Higher Currents

♦ Dynamic Output Voltages with Automatic Fault Blanking and Transition Control

♦ True Out-of-Phase Operation

♦ True Differential Current Sense for Accurate Current Limit and Current Balance

♦ 4V to 26V Input Range

♦ 100kHz to 600kHz Switching Frequency

♦ 0.5V to 2.5V Adjustable Outputs

♦ Internal Integrator for High Output Accuracy

♦ Stable with Low-ESR Output Capacitors

♦ Independent Selectable PWM and Skip-Mode Operation

♦ Independent Power-Good Outputs

♦ Soft-Start and Soft-Stop

♦ 2.5V Precision Reference

♦ < 1µA Typical Shutdown Current

Applications

  2 to 4 Li+ Cells Battery-Powered Devices

  Media Center and Gaming Notebooks

  GPU and I/O Power Supplies

  Tracking Output Power Supplies