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RT9045

Cost-Effective, 1.8A Sink/Source Bus Termination Regulator

Richtek Technology 

RT9045

Cost-Effective, 1.8A Sink/Source Bus Termination Regulator

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.

The RT9045 also incorporates a high-speed differential

amplifier to provide ultra-fast response in line/load transient.

Other features include extremely low initial offset voltage,

excellent load regulation, current limiting in bi-directions

and on-chip thermal shutdown protection.

Ordering Information

RT9045

Package Type

SP : SOP-8 (Exposed Pad-Option 2)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

Note :

Richtek products are :

RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.

Marking Information

RT9045GSP

RT9045

GSPYMDNN

RT9045GSP : Product Number

YMDNN : Date Code

Features

z Ideal for DDR VTT Applications

z 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

z Integrated Power MOSFETs

z Generate Termination Voltage for DDR Memory

Interfaces

z Stable with Output Ceramic Capacitor

z High Accuracy Output Voltage at Full-Load

z Output Adjustment by Two External Resistors

z Low External Component Count

z Shutdown for Suspend to RAM (STR) Functionality

with High Impedance Output

z Current Limiting Protection

z On-Chip Thermal Protection

z RoHS Compliant

Applications

z Desktop PCs, Notebooks, and Workstations

z Graphics Card Memory Termination

z Set Top Boxes, Digital TVs, Printers

z Embedded Systems

z Active Termination Buses

z DDR Memory Systems

Pin Configurations

(TOP VIEW)

VIN

GND

REFEN

VOUT

8

2

7

GND

3

96

4

5

NC

NC

VCNTL

NC

SOP-8 (Exposed Pad)

RT9045ZSP

RT9045

ZSPYMDNN

RT9045ZSP : Product Number

YMDNN : Date Code

DS9045-04 August 2011

www.richtek.com

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