General Description

The RT9199 is a simple, cost-effective and high-speed linear regulator designed to generate termination voltage in double data rate (DDR) memory system to comply with the devices requirements. The regulator is capable of actively sinking or sourcing up to 2A peak while regulating an output voltage to within 20mV. The output termination voltage can be tightly regulated to track 1/2VDDQ by two external voltage divider resistors or the desired output voltage can be pro-grammed by externally forcing the REFEN pin voltage.

Features

Ideal for DDR-II VTT Applications

Sink and Source 2A Peak Current

Integrated Power MOSFETs

Generate Termination Voltage for DDR Memory Interfaces

High Accuracy Output Voltage at Full-Load

Output Adjustment by Two External Resistors

Low External Component Count

Shutdown for Suspend to RAM (STR) Functionality with High-Impedance Output

Current Limiting Protection

On-Chip Thermal Protection

RoHS Compliant and 100 Lead (Pb)-Free

Applications

Desktop PCs, Notebooks, and Workstations

Graphics Card Memory Termination

Set Top Boxes, Digital TVs, Printers

Embedded Systems

Active Termination Buses

DDR/II Memory Systems