CXEP3475 CXEP3475B是一种线性调节器，设计用于满足用于DDR I/II/III/IIIL-SDRAM端接的JEDEC SSTL-18、SSTL-2和SSTL-3（系列存根端接逻辑）规范。它包含一个高速运算放大器，对负载瞬变有很好的响应。该装置可在DDR I/II/III/iil SDRAM终端等应用中提供3A连续电流。CXEP3475 CXEP3475B可以通过两个外部电阻产生参考电压，轻松提供准确的VTT电压。静态电流低达750μA@VCNTL=3.3V，满足低功耗应用。CXEP3475 CXEP3475B还具有关闭功能，通过将VREF设置为小于0.2V，从而提供暂挂到RAM（STR）功能。当处于关机模式时，VTT输出（在VOUT引脚上）将为三态，提供高阻抗。在这种模式下，通过将静态电流降低到50μA@VCNTL=3.3V，可以获得节电优势。
支持DDR I（1.25 VTT）、DDR II（0.9 VTT）、DDR III（0.75 VTT）、DDR IIIL（0.675VTT）和DDR IV（0.6 VTT）要求
VCNTL电源电压：3V至5.5V
终端电源电压：1.2V至3.6V
输出陶瓷电容器稳定
·过电流保护
热关机保护
STR（S3）模式的关闭功能
带电阻器的可调输出电压
内置软启动
功率MOS集成
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[ CXEP3475 ]"
目录
7.相关产品
产品概述 返回TOP
The CXEP3475 CXEP3475B is a linear regulator designed to meet the JEDEC SSTL-18, SSTL-2 and SSTL-3 (Series Stub Termination Logic) specifications for termination of DDR I/II/III/IIIL -SDRAM. It contains a high-speed operational amplifier that provides excellent response to the load transients. This device can deliver 3A continuous current in the application such as required for DDR I/II/III /IIIL SDRAM termination. The CXEP3475 CXEP3475B can easily provide the accurate VTT voltage with two external resistors generating reference voltage. The quiescent current is as low as 750μA @ VCNTL = 3.3V. So the power consumption can meet the low power consumption applications. The CXEP3475 CXEP3475B also has a shutdown function by setting VREF smaller than 0.2V, that provides Suspend to RAM (STR) functionality. When in the shutdown mode, the VTT output (on VOUT pin) will be tri-state providing a high impendence. A power saving advantage can be obtained in this mode through lowering the quiescent current to 50μA @ VCNTL = 3.3V.
产品特点 返回TOP
„ Support DDR I (1.25 VTT), DDR II (0.9 VTT), DDR III (0.75 VTT), DDR IIIL (0.675VTT) and DDR IV (0.6 VTT) Requirements
„ VCNTL Supply Voltage: 3V to 5.5V
„ Termination Supply Voltage : 1.2V to 3.6V
„ Stable with Output Ceramic Capacitor
„ Over Current Protection
„ Thermal Shutdown Protection
„ Shutdown Function for STR (S3) Mode
„ Adjustable Output Voltage with Resistors
„ Built-In Soft-Start
„ Power MOS integrated
„ SOP-8 (FD) and MSOP-8 (FD) Package
„ RoHS Compliant
应用范围 返回TOP
„ DDR-SDRAM Termination Voltage
„ DDR I / DDR II / DDR III / DDR IIIL Termination Voltage
„ SSTL-18
„ SSTL-2
„ SSTL-3
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DDR Terminator |
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|
Part NO. |
VDDQ (V)min |
VDDQ (V)max |
VCNTL (V) |
Isource (A) |
Isink (A) |
IVREF (mA) |
Isupply (μA) |
Note |
Package |
|
1.2 |
3.6 |
3.3~5.5 |
3 |
3 |
10 |
750 |
DDR3/3L,LPDDR2/3 |
TDFN2X2-10 |
|
|
1.2 |
3.6 |
3~5.5 |
1.8 |
1.8 |
-- |
700 |
DDR1/2/3/3L |
SOP8(FD)/MSOP-8(FD) |
|
|
1.2 |
3.6 |
3.3~5.5 |
3 |
3 |
-- |
750 |
DDR1/2/3/3L |
SOP8(FD) |
|
|
1.2 |
3.6 |
3~5.5 |
2 |
2 |
-- |
1300 |
DDR1/2/3 |
SOT23-5/SOP8/ MSOP8(FD) |
|
|
1.6 |
5.5 |
1.6~5.5 |
1.5 |
1.5 |
0.03 |
280 |
DDR1/2 |
SOP8(FD) |
|
|
1.2 |
3.6 |
3~5.5 |
4~3 |
4~3 |
10 |
800 |
DDR1/2/3/3L |
MSOP10(FD)/MSOP8(FD) |
|
|
1.2 |
3.6 |
3~5.5 |
4~3 |
4~3 |
10 |
900 |
DDR1/2/3/3L |
MSOP8/SOP8(FD) |
|
|
1.2 |
3.6 |
3~5.5 |
4 |
4 |
10 |
900 |
DDR1/2/3 |
SOP8(FD) |
|
