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RT9089AGQW DDR Termination Regulator Evaluation Board

EVB_RT9089AGQW

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The RT9089A is a sink/source tracking termination regulator. It is specifically designed for low-cost and lowexternal component count systems. The RT9089A possesses a high speed operating amplifier that provides fast load transient response and only requires a minimum 10μF ceramic output capacitor. The RT9089A supports remote sensing functions and all features required to power the DDRI/DDRII/DDRIII and Low Power DDRIII/DDRIV VTT bus termination according to the JEDEC specification. The RT9089A is available in the thermal efficient package, WDFN-10L 2x2.

Purpose

The RT9089A is a sink/source tracking termination regulator. This document explains the function and use of the RT9089A evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to suit individual requirements.


Introduction

General Product Information

The RT9089A is a sink/source tracking termination regulator. It is specifically designed for low-cost and lowexternal component count systems. The RT9089A possesses a high speed operating amplifier that provides fast load transient response and only requires a minimum 10μF ceramic output capacitor. The RT9089A supports remote sensing functions and all features required to power the DDRI/DDRII/DDRIII and Low Power DDRIII/DDRIV VTT bus termination according to the JEDEC specification. The RT9089A is available in the thermal efficient package, WDFN-10L 2x2.


Product Feature

  • VIN Input Voltage Range : 1.1V to 3.5V
  • VCNTL Input Voltage Range : 2.9V to 5.5V
  • Support Ceramic Capacitors
  • 10mA Source/Sink Reference Output
  • Meet DDRI, DDRII JEDEC Spec
  • Support DDRIII, Low Power DDRIII/DDRIV VTT Applications
  • Soft-Start Function
  • UVLO and OCP Protection
  • Thermal Shutdown

 


Applications

  • Notebook/Desktop/Server
  • Telecom/Datacom, GSM Base Station, LCD-TV/PDPTV, Copier/Printer, Set-Top Box

 


Key Performance Summary Table

Key Features

Evaluation Board Number : PCB043_V1

VIN Input Voltage Range

1.1V to 3.5V

VCNTL Input Voltage Range

2.9V to 5.5V

Max Output Current

2A

Default Output Voltage

Set by VDDQSNS pin voltage level (VOUT = VDDQSNS / 2)

Default Marking & Package Type

RT9089AGQW, WDFN-10L 2x2



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to evb_service@richtek.com



Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test point/

Pin name

Signal

Comment (expected waveforms or voltage levels on test points)

VIN

Input voltage

Power input of the regulator.

VOUT

Output voltage

Power output of the regulator.

VDDQSNS

Reference input

Reference input.

GND

Ground

Analog ground. Connect to negative terminal of the output capacitor. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.

PGND

Power ground

Power ground of the regulator.

SENSE

Voltage sense input

Voltage sense input for the regulator. Connect to positive terminal of the output capacitor or the load.

REFOUT

Reference output

Reference output. Connect to GND through a 0.1µF ceramic capacitor.

S3

S3 signal input

S3 signal input.

S5

S5 signal input

S5 signal input.

VCNTL

Power good output test point

Control voltage input. Connect this pin to the 3.3V or 5V power supply. A ceramic decoupling capacitor with a value 4.7µF is required.



Power-up & Measurement Procedure

1. Short J1, J8, the (1, 2) pin of J2 and the (1, 2) pin of J7 by jumper respectively.

2. Provide input voltage (2.9V < VCNTL < 5.5V) to VCNTL pin.

3. Connect input power (1.1V < VIN < 3.5V) and input ground to Vin and GND pins respectively.

4. Connect positive end and negative end of load to VOUT and GND of output pins respectively.

5. The output voltage (VOUT) can be set by the voltage level of VDDQSNS, since VDDQSNS is short with VIN :

VOUT = (VDDQSNS / 2) = (VIN / 2)



Specification

Parameter

Symbol

Min

Typ.

Max

Units

Control Input Voltage

VCNTL

2.9

5.5

V

Supply Input Voltage

VIN

1.1

3.5

V

VOUT Source Current Limit

ILIM_VOUT_SR

2

A

VOUT Sink Current Limit

ILIM_VOUT_SK

2

A



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

U1

1

RT9089AGQW

DDR Termination Regulator

WDFN-10L 2x2

RICHTEK

C12

1

C2012X5R0J475KT00HW

4.7µF/6.3V/X5R

C-0805

TDK

C13

1

0805B104K500

0.1µF/50V/X7R

C-0805

WALSIN

C2, C3

2

C2012X5R1C106KT

10µF/16V/X5R

C-0805

TDK

C6

1

C2012X5R1C106KT

10µF/16V/X5R

C-0805

TDK

C1, C4, C5, C7, C8, C9, C10, C11, C14, C15, C16, C17, C18, C19, R2, R5

16

NC

R1, R4

2

R-0603



PCB Layout

Technical Document Image Preview

Top View (1st layer)

Technical Document Image Preview

PCB Layout—Inner Side (2nd Layer)

Technical Document Image Preview

PCB Layout—Inner Side (3rd Layer)

Technical Document Image Preview

Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2015/10/27
Bill of Materials 2015/10/27
Gerber File 2015/10/27
Schematic 2015/10/27
RT9089A

DDR Termination Regulator

RT9089A

The RT9089A is a sink/source tracking termination regulator. It is specifically designed for low-cost and low-external component count systems. The RT9089A possesses a high speed operating amplifier that provides fast load transient response and only requires a minimum 10μF ceramic output capacitor. The RT9089A supports remote sensing functions and all features required to power the DDRI/DDRII/DDRIII/DDRIV/LPDDRII/LPDDRIII VTT bus termination according to the JEDEC specification.

The RT9089A is available in the thermal efficient package, WDFN-10L 2x2.

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EVB_RT9089AGQW Not available Buy from Distributor
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