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Step-down controller rolls for notebook memories

Posted: 18 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:PWM? step-down controller? DDR3 memory? notebook?

MAX17000 Quick-PWM

Maxim Integrated Products has launched the MAX17000 Quick-PWM step-down controller for DDR, DDR2 and DDR3 memory in notebook computers.

The single-chip solution saves valuable board space by integrating a step-down controller, source/sink linear regulator and reference buffer, thus enabling it to generate all required VDDQ, VTT, and VTTR rails. The MAX17000 is designed for stepping-down high voltages in notebook computers.

The controller supplies the VDDQ rail, providing a 1 percent accurate output voltage over the line-and-load operating range. The 2A source/sink regulator generates the memory-termination VTT rail. Featuring a 5mV deadband, the VTT regulator reduces output capacitance requirements and sources or sinks, making it suitable for the fast-changing short loads in memory-termination applications. The VTTR reference buffer sources and sinks 3mA, providing the reference voltage for the memory controller and devices on the memory bus.

In addition, the MAX17000 utilizes Maxim's proprietary, Quick-PWM architecture to support wide I/O voltage ratios and provide excellent transient response, while maintaining a relatively constant switching frequency. This architecture avoids the poor load-transient timing problems of fixed-frequency, current-mode pulse-width modulators (PWM), as well as the widely varying switching frequencies in conventional constant-on-time and constant-off-time PWM schemes.

This controller offers three different operating modes: a power-efficient skip mode, a low-noise forced-PWM mode, and a standby mode that supports memory when the notebook computer is in standby operation. The MAX17000 also features overvoltage, undervoltage, and thermal protection.

The MAX17000 is available in a small, 4mm x 4mm, 24-pin TQFN package, and is fully specified over the -40C to 85C extended-industrial temperature range. Prices start at $2.75 (1000-up, FOB USA). An evaluation kit is available to reduce design time.

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