CXEP3475 CXEP3475B线性调节器高速运算放大器对负载瞬变有很好的响应通过两个外部电阻产生参考电压提供准确的VTT电压带电阻器的可调输出电压内置软启动

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

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

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

   技术规格书（产品PDF) 返回TOP 

---

     需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！

 

产品封装图 返回TOP

---

电路原理图 返回TOP

---

相关芯片选择指南 返回TOP                              更多同类产品.......

---

DDR Terminator
Part   NO.	VDDQ (V)min	VDDQ (V)max	VCNTL (V)	Isource (A)	Isink (A)	IVREF (mA)	Isupply (μA)	Note	Package
CXEP3473	1.2	3.6	3.3~5.5	3	3	10	750	DDR3/3L,LPDDR2/3	TDFN2X2-10
CXEP3474	1.2	3.6	3~5.5	1.8	1.8	--	700	DDR1/2/3/3L	SOP8(FD)/MSOP-8(FD)
CXEP3475	1.2	3.6	3.3~5.5	3	3	--	750	DDR1/2/3/3L	SOP8(FD)
CXEP3475B	1.2	3.6	3~5.5	2	2	--	1300	DDR1/2/3	SOT23-5/SOP8/ MSOP8(FD)
CXEP3476/7	1.6	5.5	1.6~5.5	1.5	1.5	0.03	280	DDR1/2	SOP8(FD)
CXEP3478/B	1.2	3.6	3~5.5	4~3	4~3	10	800	DDR1/2/3/3L	MSOP10(FD)/MSOP8(FD)
CXEP3479	1.2	3.6	3~5.5	4~3	4~3	10	900	DDR1/2/3/3L	MSOP8/SOP8(FD)
CXEP3480	1.2	3.6	3~5.5	4	4	10	900	DDR1/2/3	SOP8(FD)