The integrated device are said to significantly reduce the number of external components typically required to support all the power management for DDR systems, such as Micron's DDR and DDR II systems, in applications such as notebook and desktop computers, graphics cards and game machines.

TI's new TPS51116 integrates a synchronous current mode DC/DC controller to power Vddq, a 3A LDO regulator to power Vtt and a buffered reference, Vref. Fully compliant to DDR and DDR II JEDEC specifications, a complete DDR power solution can be achieved by including the power train for the switcher, and adding as few as seven external resistors and capacitors - compared to today's systems that use 18 or more separate power management components.

The TPS51116 has excellent light load efficiency, achieving greater than 85% Vddq efficiency at 10mA. The high performance LDO can sink/source 3A peak currents while only needing a 2x10-micro-F ceramic output capacitor.

The switcher inside the TPS51116 employs a control technique called D-CAP mode to supply 100ns of load-step transient response and reduce the number of external output capacitors. D-CAP mode also eliminates the need for external loop compensation; however, if more control is required, loop compensation for the TPS51116 can be changed to support any output capacitor type, including ceramic. The integrated LDO requires 2x10-micro-F ceramic output capacitors, and can significantly reduce power dissipated in the system by reducing its input voltage. Capable of supporting many design types, Vddq voltage level can be adjusted or fixed at 2.5V for DDR and at 1.8V for DDR II.

The device comes in a 20-lead PowerPAD HTSSOP package. Suggested resale pricing is US$1.20 each in quantities of 1,000. The TPS51100 low-cost DDR power IC is available today at US$0.80 each in quantities of 1,000 units.

By: DocMemory
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