The ISL9440, ISL9440A and ISL9441 are quad-output synchronous buck controllers that integrate 3 PWM controllers and 1 low drop-out linear regulator controller, which are full featured and designed to provide multi-rail power for use in products such as cable and satellite set-top boxes, VoIP gateways, cable modems, and other home connectivity products as well as a variety of industrial and general purpose applications. Each output is adjustable down to 0.8V. The PWMs are synchronized at 180° out of phase thus reducing the RMS input current and ripple voltage. Application Note 1550 ISL9440EVAL2Z: Triple PWM Step-Down Synchronous Buck Controller and One LDO ISL9440EVAL2Z Evaluation TABLE 1. FEATURES OF ISL944xx FAMILY Board SWITCHING SOFT-STARTING PART EARLY FREQUENCY TIME The ISL9440EVAL2Z evaluation board features the NUMBER WARNING (kHz) (ms) ISL9440. The ISL9440 is a quad-output controller that integrates three PWM synchronous buck controllers and I……