The MAX1887/MAX1897 step-down slave controllers areintended for low-voltage, high-current, multiphase DC-to-DC applications. The MAX1887/MAX1897 slave con-trollers can be combined with any of Maxim'sQuick-PWM™ step-down controllers to form a multiphaseDC-to-DC converter. Existing Quick-PWM controllers,such as the MAX1718, function as the master controller,providing accurate output voltage regulation, fast tran-sient response, and fault protection features.Synchronized to the master's low-side gate driver, theMAX1887/MAX1897 include the Quick-PWM constant on-time controller, gate drivers for a synchronous rectifier,active current balancing, and precision current-limit cir-cuitry. The MAX1887/MAX1897 provide the same high effi-ciency, ultra-low duty factor capability, and excellenttransient response as other Quick-PWM controllers. TheMAX1887/MAX1897 differentially sense the inductorcurrents of both the master and the slave across cur-rent-sense resistors. These differential inputs and theadjustable current-limit threshold derived from an exter-nal reference allow the slave controller to accuratelybalance the inductor currents and provide precise cur-rent-limit protection. The MAX1887/MAX1897's dual-purpose current-limit input also allows the slavecontroller to automatically enter a low-power standbymode when the master controller shuts down. The MAX1887 triggers on the rising edge of the mas-ter's low-side gate driver, which staggers the on-timesof both master and slave, providing out-of-phase oper-ation that can reduce the input ripple current and con-sequently the number of input capacitors. TheMAX1897 features a selectable trigger polarity, allowing
out-of-phase or simultaneous in-phase operation.
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