MAXIM MAX1917EEE

The MAX1917 provides a complete power-management solution for DDR memory. It contains a synchronous buck controller and an amplifier to generate 1/2VDDR voltage for VTT and VTTR. The VTT and VTTR voltages are maintained within 1% of 1/2VDDR. The controller operates in synchronous rectification mode to ensure balanced current sourcing and sinking capability of up to 25A. With a shutdown current of less than 5μA, the MAX1917 is the best choice for low-power notebook applications, as well as servers and desktop computers. An all N-FET design optimizes efficiency. The MAX1917 can also be used for generating VDDR and as a general-purpose step-down controller with variable switching frequency as high as 1MHz with few additional components. The MAX1917 uses Maxim’s proprietary Quick-PWM architecture for fast transient response up to 96% efficiency, and the smallest external components. Output current monitoring is achieved without sense resistors by monitoring the bottom FET’s drain-to-source voltage. The current-limit threshold is programmable through an external resistor. The MAX1917 comes in a space-saving 16-pin QSOP package.

• 25A Sourcing and Sinking Current
• Automatically Sets VTT to 1/2VDDR
• VTT and VTTR Within 1% of 1/2VDDR
• Smallest Output Capacitors
• 4.5V to 14V (or 28V with Resistor-Divider) Input Voltage Range
• 1.5V to 3.6V Input DDR Range
• 200kHz/300kHz/400kHz/550kHz Preset Switching Frequencies
• Variable Switching Frequency of Up to 1MHz
• Overcurrent Protection Without Current-Sense Resistor
• Internal Soft-Start
• VTTR Reference Sources and Sinks Up to 25mA
• Quick-PWM Control for Fastest Loop Response
• Up to 96% Efficiency
• 16-Pin QSOP Package

• DDR Memory Power
• Notebook Computers Supply
• Desktop Computers
• Processor or DSP Core Storage Supply
• Networking Systems
• AGTL Bus Termination Supply