MAX8538
Dual-Synchronous Buck Controllers for Point-of-Load, Tracking, and DDR Memory Power Supplies
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Overview
Features and Benefits
- 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
Product Details
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 reference can supply up to 15mA output.
The MAX8537/MAX8538/MAX8539 use constant-frequency voltage-mode architecture with operating frequencies of 200kHz to 1.4MHz. An internal high- bandwidth (25MHz) operational amplifier is used as an error amplifier to regulate the output voltage. This allows fast transient response, reducing the number of output capacitors. An all-N-FET design optimizes efficiency and cost. The MAX8537/MAX8538/MAX8539 have a 1% accurate reference. The second synchronous buck controller in the MAX8537/MAX8539 and the VTTR amplifier generate 1/2 VDDQ voltage for VTT and VTTR, and track the VDDQ within ±1%.
This family of controllers uses a high-side current-sense architecture for current limiting. ILIM pins allow the setting of an adjustable, lossless current limit for different combinations of load current and RDSON. Alternately, more accurate overcurrent limit is achieved by using a sense resistor in series with the high-side FET. Overvoltage protection is achieved by latching off the high-side MOSFET and latching on the low-side MOSFET when the output voltage exceeds 17% of its set output. Independent enable, power-good, and soft-start features enhance flexibility.
Applications
- Broadband Routers
- DDR Memory Power Supplies
- Networking Systems
- Notebooks and Desknotes
- Power Combiner in Advanced VGA Cards
- Power DSP Core Supplies
- RAMBUS Memory Power Supplies
- Servers and Storage Systems
- xDSL Modems and Routers
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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