參數(shù)資料
型號(hào)： CM3121-02SB
廠商： California Micro Devices Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Dual Linear Voltage Regulator for DDR-I and DDR-II Memory
中文描述： 雙線性穩(wěn)壓器，用于DDR I和DDR - II內(nèi)存
文件頁(yè)數(shù)： 9/11頁(yè)
文件大小： 219K
代理商： CM3121-02SB
2004 California Micro Devices Corp. All rights reserved.
11/12/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.calmicro.com
9
CM3121
PRELIMINARY
Application Information
Other Applications
The CM3121 can be used without any external resis-
tors if a V
DDQ
voltage of 2.5V is required by connecting
the SENSE_V
DDQ
pin to GND.
Also in applications where a reference voltage (V
REF
)
is required, a PCB trace directly from the V
TT
pin can
be used. The V
TT
output pin has an error relative to
V
DDQ
/2 of up to +/-25mV, which is well within most
DDR system specs of +/-50mV. This is because the
V
TT
output internally tracks the V
DDQ
output very
closely due to the matched on-chip resistors R that tap
down from the V
DDQ
rail, and the low offset voltage of
the V
TT
regulator. It is recommended that the V
REF
trace be connected directly to the V
TT
pin, to eliminate
noise and ripple on the V
TT
line caused by current
switching
.
Figure 4. Typical Application for the CM3121
V
REF
=1.25V
V
REF
R
R
FAULT
V
TT
=1.25V
V
DDQ
REGULATOR
V
TT
REGULATOR
EN_DDR
V
CC
GND
C
DDQ
DDR
MEMORY
CPU
CORE
+ I/O
C
CC
C
TT
Enable DDR
Memory #
2.8V to 3.6V
SENSE V
TT
V
TT
V
DDQ
SENSE
V
DDQ
CURRENT LIMIT
OVERTEMP
LOW INPUT
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CM3121-02SH 制造商:CALMIRCO 制造商全稱:California Micro Devices Corp 功能描述:Dual Linear Voltage Regulator for DDR-I and DDR-II Memory
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