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參數(shù)資料
| 型號： | SC2596 |
| 廠商： | Semtech Corporation |
| 英文描述： | Low Voltage Integrated DDR Termination Regulator |
| 中文描述： | 低電壓集成DDR終端穩(wěn)壓器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 300K |
| 代理商： | SC2596 |
9
2007 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
Application Information
SC2596
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 designers.
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.
The PVCC pin provides the rail voltage from where the
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
regulation.
VSENSE
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
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 current.
It is recommanded the VSENSE pin should be connected
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
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.
Figure 1: Standard SSTL-2 application.
C
10nF
EN
1.25V
VDDQ
Cout
220uF
1.25V
Cin1
1uF
SC2596
GND
1
EN
2
VSENSE
3
VREF
4
VDDQ
5
AVCC
6
PVCC
7
VTT
8
Cin2
100uF
VTT
Cref
100nF
2.5V
VREF
0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC2596EVB | Low Voltage Integrated DDR Termination Regulator |
| SC2596SETRT | Low Voltage Integrated DDR Termination Regulator |
| SC2602L | Synchronous Voltage Mode Controller for Distributed Power Supply |
| SC2602LEVB | Synchronous Voltage Mode Controller for Distributed Power Supply |
| SC2602LSTRT | Synchronous Voltage Mode Controller for Distributed Power Supply |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC2596_09 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Voltage Integrated DDR Termination Regulator |
| SC2596EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Low Voltage Integrated DDR Termination Regulator |
| SC2596SETRT | 功能描述:IC INTEGRTD DDR TERM REG 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:2,000 系列:- 應用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
| SC2596STRT | 功能描述:IC INTEGRTD DDRII TERM REG 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| SC25A | 制造商:GXELECTRONICS 制造商全稱:Gaomi Xinghe Electronics Co., Ltd. 功能描述:High current capability |
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