The MAX17003A/MAX17004A are dual step-down, switch-mode, power-supply (SMPS) controllers with synchronous rectification, intended for main 5V/3.3V power generation in battery-powered systems. Fixedfrequency operation with optimal interleaving minimizes input ripple current from the lowest input voltages up to the 26V maximum input. Optimal 40/60 interleaving allows the input voltage to go down to 8.3V before dutycycle overlap occurs, compared to 180 out-of-phase regulators where the duty-cycle overlap occurs when the input drops below 10V.