MAX8775 Datasheet | Maxim Integrated

Description Features o Dual-Output, Fixed-Frequency, Current-Mode Control o binable Output for Higher Currents o Dynamic Output Voltages with Automatic Fault Blanking and Transition Control o True Out-of-Phase Operation o True Differential Current Sense for Accurate Current Limit and Current Balance o 4V to 26V Input Range o 100k Hz to 600k Hz Switching Frequency o 0.5V to 2.5V Adjustable Outputs o Internal Integrator for High Output Accuracy o Stable with Low-ESR Output Capacitors o Independent Selectable PWM and Skip-Mode Operation o Independent Power-Good Outputs o Soft-Start and Soft-Stop o 2.5V Precision Reference o < 1µA Typical Shutdown Current The MAX8775 is a dual, step-down, interleaved, fixedfrequency, 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 bined mode, the MAX8775 functions as a twophase, high-current, single-output GPU core regulator, powering the high-performance GPU engines used in gaming machines and media center notebooks. The REFIN voltage setting allows for multiple dynamic output voltages required by the different GPU operating and sleep states. Automatic fault blanking, forced-PWM operation, and transition control are achieved by detecting the voltage change at REFIN. Fixed-frequency operation with 180° out-of-phase interleaving minimizes input ripple current from the lowest input voltages up to the 26V maximum input. Current-mode control allows the use of low-ESR output capacitors. Internal integrators maintain high output accuracy over the full line-and-load range, in both forced-PWM mode and pulse-skipping mode. True...