CXEP3474是一种线性调节器，设计用于满足DDRI/II/III/IIIL/IV-SDRAM系统中的JEDEC SSTL（系列存根终端逻辑）规范。它提供精确和快速的响应，在负载瞬变中跟踪参考电压的源/汇能力高达1.8A。端接电压可以由两个外部电阻产生，也可以通过在期望电压下强制VREF引脚进行编程。此外，CXEP3474在低至0.7毫安的低功耗下工作，通过将VREF设置为低于0.15伏，它具有关机功能，然后关闭VTT并通过内部MOSFET放电。该功能在STR模式下获得50μA的低静态电流。
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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[ CXEP3474 ]
目录
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产品概述 返回TOP
The CXEP3474 is a linear regulator designed to meet the JEDEC SSTL (Series Stub Termination Logic) specifications in DDRI/II/III/IIIL/IV –SDRAM systems. It provides accurate and fast response with up to 1.8A source/sink ability in load transient to track reference voltage. The terminated voltage can be generated by two external resistors or programmed by forcing VREF pin at a desired voltage. Also the CXEP3474 operate in low power consumption as low as 0.7mA and it has a shutdown function by setting VREF lower than 0.15V then the VTT is turned off and discharged via an internal MOSFET. This function obtains low quiescent current as 50μA for STR mode.
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 I/II/III/IIIL/IV Memory Termination
„ SSTL_3, SSTL_2, SSTL_18, SSTL_15
„ Notebook/Desktop/Server
„ Telecom/Datacom, GSM Base Station, LCD-TV/PDP-TV, Copier/Printer, Set-Top Box
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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) |
|
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