General Description

The RT9045 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 1.8A while regulating an output voltage to within 20mV. The output termination voltage can be tightly regulated to track VDDQ/ 2 by two external voltage divider resistors or the desired output voltage can be programmed by externally forcing the REFEN pin voltage.

Features

Ideal for DDR VTT Applications

Sink and Source Current :

DDRII 1.8A Sink/Source @ VIN = 1.8V

DDRIII 1.5A Sink/Source @ VIN = 1.5V

LPDDRIII 1.2A Sink/Source @ VIN = 1.35V

`DDRIV 1.2A Sink/Source @ VIN = 1.2V

Integrated Power MOSFETs

Generate Termination Voltage for DDR Memory Interfaces

Stable with Output Ceramic Capacitor

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

Applications

Desktop PCs, Notebooks, and Workstations

Graphics Card Memory Termination

Set Top Boxes, Digital TVs, Printers

Embedded Systems

Active Termination Buses

DDR Memory Systems