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| 型号： | SC2596SETRT |
| 厂商： | Semtech |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC INTEGRTD DDR TERM REG 8-SOIC |
| 标准包装： | 1 |
| 应用： | 转换器，DDR |
| 输入电压： | 2.3 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.9V，1.25V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC-EP |
| 包装： | 标准包装 |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC2596SEDKR |
SC2596
POWER MANAGEMENT
Application Information
Overview
Double Data Rate (DDR) SDRAM was defined by JEDEC
1997. Its clock speed is the same as previous SDRAM
but data transfer speed is twice than previous SDRAM.
By now, the requirement voltage range is changed from
3.3V to 2.5V or 1.8V; the power dissipation is smaller
than SDRAM. For above reasons, it is very popular and
widely used in M/B, N/B, Video-cards, CD ROM drives,
Disk drives.
Regarding the DDR power management solution, there
are two topologies can be selected for system design-
ers. One is switching mode regulator that has bigger sink/
source current capability, but the cost is higher and needs
more board space. Another solution is linear mode regu-
lator, which costs less, and needs less board space. For
two DIMM motherboards, system designers usually
choose the linear mode regulator for DDR power man-
agement solution.
Thermal shutdown
The SC2596 has built-in thermal detected circuit to pre-
vent this device from over temperature and damage.
The SC2596 goes into shunt down mode when tem-
perature is higher than 165 O C. The protection condition
will release when the temperature of device drop down
by 10 O C.
AVCC and PVCC
AVCC and PVCC are the input supply pins for the SC2596.
AVCC is supply voltage for all the internal control circuitry.
The AVCC voltage has to be greater than its UVLO thresh-
old voltage (2.1V typical) to allow the SC2596 to be nor-
mal operation.
cause a large trace inductance and trace resistance.
Consider the load transient condition, a fast load cur-
rent going through VTT strip plane will create a voltage
spike on VTT plane and a DC voltage drop for load cur-
rent. It is recommanded the VSENSE pin should be con-
nected center of VTT plane to improve regulation and
transient response.
A longer trace of VSENSE may pick up noise and cause
the error of load regulation. Hence designer should avoid
a longer trace between VSENSE to VTT plane. A 100nF
ceramic capacitor close to VSENSE pin is required.
VREF
VREF pin is an output pin to provid internal reference
voltage. System designer can use the voltage for
Northbridge chipset and memory. It is necessary to add
a ceramic capacitor (100nF) from VREF pin to ground
with shortest trace.
Typical Application Circuits & Waveforms
Four different application circuits are shown below in Fig-
ure 1, Figure 2, Figure 3 and Figure 4. Each circuit is
designed for a specific condition. See Note a. and b.
below for recommended power up sequencing.
Application_1: Standard SSTL-2 Application
The AVCC pin, PVCC pin and the V DDQ pin can be tied
together for SSTL-2 application (Figure 1). It only needs
a 2.5V power rail for normal operation. System designer
can save the PCB space and reduce the cost.
VDDQ/EN=2.5V
The PVCC pin provides the rail voltage from where the
1
GND
SC2596
VTT
8
VTT/1.25V
VTT pin draws load current. There is a limitation between
AVCC and PVCC. The PVCC voltage must be less or equal
to AVCC voltage to ensure the correct VTT output voltage
2
3
EN
VSENSE
PVCC
AVCC
7
6
regulation.
VREF/1.25V
4
VREF
VDDQ
5
VSENSE
Csense
100nF
CREF
100nF
CIN1
CIN2
1uF
COUT
100uF
220uF
VSENSE pin is a feedback pin from VTT plane. VTT plane
is always a narrow and long strip plane in most
montherboard applications. This long strip plane will
0
Figure 1: Standard SSTL-2 application.
? 2009 Semtech Corp.
9
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC2596STRT | 功能描述:IC INTEGRTD DDRII TERM REG 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| SC25A | 制造商:GXELECTRONICS 制造商全称:Gaomi Xinghe Electronics Co., Ltd. 功能描述:High current capability |
| SC25B | 制造商:GXELECTRONICS 制造商全称:Gaomi Xinghe Electronics Co., Ltd. 功能描述:High current capability |
| SC25D | 制造商:GXELECTRONICS 制造商全称:Gaomi Xinghe Electronics Co., Ltd. 功能描述:High current capability |
| SC25-FM-M25 | 制造商:HellermannTyton 功能描述:SC25-FM-M25-NPB-ML-1 |
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