loading
Richtek

RT9088GQW DDR Termination Regulator Evaluation Board

EVB_RT9088GQW

Share

The RT9088 is a sink/source tracking termination regulator. It is specifically designed for low-cost and low-external component count systems. The RT9088 possesses a high speed operating amplifier that provides fast load transient response and only requires a minimum 30μF ceramic output capacitor. The RT9088 supports remote sensing functions and all features required to power the DDRIII and Low Power DDRIII/DDRIV VTT bus termination according to the JEDEC specification. In addition, the RT9088 provides an open-drain PGOOD signal to monitor the output regulation and an EN signal that can be used to discharge VTT during S3 (suspend to RAM) for DDR applications. The RT9088 is available in the thermal efficient package, WDFN-10L 3x3.

Purpose

The RT9088 is a sink/source tracking termination regulator. This document explains the function and use of the RT9088 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 RT9088 is a sink/source tracking termination regulator. It is specifically designed for low-cost and low-external component count systems. The RT9088 possesses a high speed operating amplifier that provides fast load transient response and only requires a minimum 30μF ceramic output capacitor. The RT9088 supports remote sensing functions and all features required to power the DDRIII and Low Power DDRIII/DDRIV VTT bus termination according to the JEDEC specification. In addition, the RT9088 provides an open-drain PGOOD signal to monitor the output regulation and an EN signal that can be used to discharge VTT during S3 (suspend to RAM) for DDR applications. The RT9088 is available in the thermal efficient package, WDFN-10L 3x3.


Product Feature

  • VIN Input Voltage Range : 1.1V to 3.5V
  • VCNTL Input Voltage Range : 2.9V to 5.5V
  • Support Ceramic Capacitors
  • Power Good Indicator
  • 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 : PCB027_V1

VIN Input Voltage Range

1.1V to 3.5V

VCNTL Input Voltage Range

2.9V to 5.5V

Max Output Current

3A

Default Output Voltage

Set by REFIN pin voltage level (VOUT = VREFIN)

Default Marking & Package Type

RT9088GQW, WDFN-10L 3x3



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.

EN

Enable test point

Enable Control Input. EN = High (higher than 1.7V) for ON operation, while EN = Low (lower than 0.3V) for OFF operation.

GND

Ground

Ground.

VCNTL

Control voltage input

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.

REFIN

Reference input

Reference input.

REFOUT

Reference output

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

PGOOD

Power good output test point

Power good open-drain output. Connect a pull-up resistor between this pin and VCNTL pin.



Power-up & Measurement Procedure

1. Short J1 and the (1, 2) pin of J2 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 of (VOUT) can be set by R1 and R2 :

6. If J1 is not shorted by Jumper, the output voltage can be set by the input voltage of REFIN pin :

VOUT = VREFIN



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

3.5

5.5

A

VOUT Sink Current Limit

ILIM_VOUT_SK

3.5

5.5

A

REFIN Voltage Range

VREFIN

0.5

1.8

V



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

RT9088GQW

DDR Termination Regulator

WDFN-10L 3x3

RICHTEK

C2, C3, C6, C7, C8

5

GRM219R61A106KE44D

10µF/X5R/16V

C-0805

MURATA

C13

1

C1608X7R1H104K080AA

0.1µF/50V/X7R

C-0603

TDK

C12

1

C2012X5R0J475KT00HW

4.7µF/X5R/6.3V

C-0805

TDK

C1

1

0603B102K500

1nF/50V/X7R

C-0603

WALSIN

C4, C5, C9, C10, C11, C14, C15, C16, C17, C18, C19

11

NC

R1, R2

2

10k

R-0603

R3

1

100k

R-0603

R4

1

0



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
RT9088

DDR存储器总线终端调节器

RT9088

RT9088 是具有电流吐纳能力的电压追踪型总线终端电压调节器,特别针对需要成本低、元件数量少的系统而设计。它使用了高速运算放大器,具有快速瞬态响应能力,仅需 30µF 以上的陶瓷输出电容即可稳定工作。它支持电压遥测功能,可满足 JEDEC 规范所定义的 DDRIII 和低功耗 DDRIII/DDRIV 内存 VTT 总线的终端供电要求。它还具有开漏的 PGOOD 信号可供进行输出调节状态的监控,其 EN 信号端子可供实现 DDR 应用中 S3(对 RAM 挂起)状态期间对 VTT 的放电。
RT9088 以WDFN-10L 3x3封装形式供货,该封装具有很好的热性能。

Part NumberFree SampleBuy From Authorized Distributor
EVB_RT9088GQW Not available Buy from Distributor
TOP