MAXREFDES1258

Description

The MAXREFDES1258 is a 1200W, 12V, 4-phase DC-DC buck converter that delivers up to 100A load current. The design is optimized for data-center applications with an input voltage range of 35V to 60V. It is also suitable for industrial, automotive and communication applications. The MAXREFDES1258 employs a MAX15157B fixed-frequency, current-mode PWM controller that drives power MOSFETs in the buck configuration, allowing the device to operate as a step-down regulator. The control loop uses a valley current-mode architecture to optimize performance with low-duty cycles and provides the shortest on-time possible. The output voltage is set externally through a resistor divider network using the 2V default internal reference. The load current is balanced equally between the two interleaved phases using a state-of-the-art differential current-sense and balancing network.

Features & Benefits

• Wide 35V to 60V input voltage range
• Highly regulated output voltage with ±1% ripple
• State-of-the-art current balancing for dual-phase operation
• Interleaved 180° out-of-phase operation
• Current monitor outputs of individual phases
• Robust fault protection
• Cycle-by-cycle and average overcurrent protection
• Multiple levels of overvoltage protection