Datasheet

1 Description
1.1 Applications
1.2 Features
Description www.ti.com
The TPS51116 is designed to be a complete power supply solution for dual data rate (DDR) memory
modules covering DDR (2.5 V/1.25 V), and DDR2 (1.8 V/0.9 V) and DDR3 (1.5 V/ 0.75 V) specifications.
By combining a high-efficiency synchronous buck switching regulator and a high-current fixed ratio
sink/source LDO regulator, the TPS51116 provides high-efficiency generation of the DDR memory cell’s
core and I/O voltages as well as providing an accurate, high-speed termination voltage. While the
TPS51116 is designed to use the VDDQ output to power the termination voltage LDO, another power
source can be used, allowing for more control and efficient operation of the termination voltage if lower
voltages are available in the system. Powerful, efficient and flexible, the TPS51116 is a single device that
can meet all DDR memory power needs.
• Dual Data Rate (DDR) High-Speed RAM Supply
• High Performance AGP Video Cards
• Notebook, Desktop and Sever Motherboards
• High Performance Computer
• High Memory Content Consumer Electronics
• Up to 85% efficiency on the V
DDQ
switching regulator output
• Dual switching regulator / LDO output for both DDR core and termination voltages
• 3-A sink/source termination voltage LDO regulator
• 10-mA termination reference voltage for DDR input reference
• User selectable DDR, DDR2, DDR3 or externally referenced supply voltages
• User selectable switching regulator or external supply source for LDO termination regulator
• Switches available for testing S3 and S5 sleep states
Using the TPS51116EVM2 SLUU202A – SEPTEMBER 2004 – Revised November 2008
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