General Description
The MAX8537/MAX8539 controllers provide a complete power-management solution for both double-data-rate (DDR) and combiner supplies. The MAX8537 and MAX8539 are configured for out-of-phase and in-phase DDR power-supply operations, respectively, and generate three outputs: the main memory voltage (VDDQ), the tracking sinking/sourcing termination voltage (VTT), and the termination reference voltage (VTTR). The MAX8538 is configured as a dual out-of-phase controller for point-of-load supplies. Each buck controller can source or sink up to 25A of current, while the termination refer ence can supply up to 15mA output.

Features
♦ MAX8537/MAX8539: Complete DDR Supplies
♦ MAX8538: Dual Nontracking Controller
♦ Out-of-Phase (MAX8537/MAX8538) or In-Phase (MAX8539) Operation
♦ 4.5V to 23V Wide Input Range (Operate Down to 1.8V Input with External 5V Supply)
♦ Tracking Supply Maintains VTT = VTTR = 1/2 VDDQ
♦ Adjustable Output from 0.8V to 3.6V with 1% Accuracy
♦ VTTR Reference Sources and Sinks Up to 15mA
♦ 200kHz to 1.4MHz Adjustable Switching Frequency
♦ All-Ceramic Design Achievable
♦ >90% Efficiency
♦ Independent POK_ and EN_
♦ Adjustable Soft-Start and Soft-Stop for Each Output
♦ Lossless Adjustable-Hiccup Current Limit
♦ Output Overvoltage Protection
♦ 28-Pin QSOP Package

Applications
   DDR Memory Power Supplies
   Notebooks and Desknotes
   Servers and Storage Systems
   Broadband Routers
   XDSL Modems and Routers
   Power DSP Core Supplies
   Power Combiner in Advanced VGA Cards
   Networking Systems
   RAMBUS Memory Power Supplies