General Description

The RT9173D 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 JEDEC SSTL_2 and SSTL_18 or other specific interfaces such as HSTL, SCSI-2 and SCSI-3 etc. devices requirements. The regulator is capable of actively sinking or sourcing continuous 2A or up to 3A transient peak current while regulating an output voltage to within 40mV. The output termination voltage cab 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.

特性 Features

Ideal for DDR-I, DDR-II and DDR-III VTT Applications

Sink and Source Current

2A Continuous Current

Peak 3A for DDRI and DDRII

Peak 2.5A for DDRIII

Integrated Power MOSFETs

Generates Termination Voltage for SSTL_2, SSTL _18, HSTL, SCSI-2 and SCSI-3 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

Available in SOP-8 (Exposed Pad) Packages

VIN and VCNTL No Power Sequence Issue

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-I, DDR-II and DDR-III Memory Systems