
	Richtek Technology Electronic Components Datasheet

RT9005B Datasheet

(RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator

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Preliminary

RT9005A/B

DDR VDDQ and Termination Voltage Regulator

General Description

The RT9005A/B is a dual-output linear regulator for DDR-

SDRAM VDDQ supply and termination voltage VTT supply.

The Regulator is capable of actively sinking or sourcing

up to 2A. The output termination voltage can be tightly

regulated to track 1/2 VDDQ by two external voltage divider

resistors.

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Ordering Information

RT9005

Package Type

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

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)

VOUT1 Output Voltage

A : 2.5V

B : 1.8V

Note :

Richtek Pb-free and Green 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.

`100% matte tin (Sn) plating.

Features

z Ideal for DDR-I and DDR-II VDDQ, VTT Applications

z Integrated Power MOSFETs

z Generates Termination Voltage for SSTL_2,

SSTL _18, HSTL, SCSI-2 and SCSI-3 Interfaces

z High Accuracy Output Voltage at Full-Load

z VOUT2 Sink and Source 2A Continuous Current

z VOUT2 Adjustment by Two External Resistors

z Shutdown for Suspend to RAM (STR) Functionality

with High-Impedance Output

z Current Limiting Protection

z On-Chip Thermal Protection

z Available in SOP-8 (Exposed Pad) Packages

z RoHS Compliant and 100% Lead (Pb)-Free

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-I and DDR-II Memory Systems

Pin Configurations

(TOP VIEW)

VIN1

VIN2

VCNTL

GND

VOUT1

GND

VOUT2

VREFEN

SOP-8 (Exposed Pad)

DS9005A/B-01 September 2007

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	Richtek Technology Electronic Components Datasheet

RT9005B Datasheet

(RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator

No Preview Available !

RT9005A/B

Preliminary

Typical Application Circuit

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VIN1

VOUT1

2N7002

CIN1

2.2uF CBP

10nF

VIN1

1 BP

VIN2

VCNTL 4

8 VOUT1

COUT1

2.2uF

RT9005A/B

VOUT2 6

5 VREFEN

CSS

1uF

GND

Exposed Pad(9)

VIN2

4C7IN02uF

VCTNL = 3.3V

CVCNTL

47uF RTT

COUT2

470uF

GND

Note : If there is any application need to use 10μF ceramic capacitor in front of RTT, please shut one 1000μF (Aluminum

eletrolytic capacitor).

Functional Pin Description

Pin No.

Pin Name

Pin Function

1 BP

Exposed Pad (9) GND

2 VIN1

Noise Reduction. Connecting a 10nF capacitor to GND to reduce output noise.

Common Ground (T he exposed pad must be soldered to a large PCB and

connected to GND for maximum power dissipation). The GND pad are a should be

as large as possible and using many vias to conduct the heat into the buried GND

plate of PCB layer.

Linear Regulator Power Input Voltage.

Input voltage which supplies current to the output pin. Connect this pin to a

well-decoupled supply voltage. To prevent the input rail from dropping during large

VIN2

load transient, a large, low ESR capacitor is recommended to use. The capacitor

should be placed as close as possible to the VIN2 pin.

VCNTL supplies the internal control circuitr y and provides the drive voltage. The

driving capability of output current is proportioned to the VCNTL. Connect this pin

VCNTL

to 3.3V bias supply to handle large output current with at least 10uF capacitor from

this pin to GND.

Reference voltage input and active low VOUT2 shutdown control pin. Two resistors

5 VREFEN dividing down the VIN voltage on the pin to create the regulated output voltage.

Pulling the pin to ground turns off the device by an open-drain, such as 2N7002,

signal N-MOSFET.

Regulator Output. VOUT2 is regulated to REFEN voltage that is used to terminate

the bus resistors. It is capable of sinking and sourcing current while regulating the

6 VOUT2 output rail. To maintain adequate large signal transient response, typical value of

1000μF AL electrolytic capacitor with 10μF ceramic capacitors are recommended to

reduce the effects of current transients on VOUT.

8 VOUT1 Regulator 2.5V/1.8/1.5V Output.

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DS9005A/B-01 September 2007

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RT9005B Datasheet

(RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator

RT9005B Datasheet

(RT9005A / RT9005B) DDR VDDQ and Termination Voltage Regulator

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