LP2995M/NOPB National Semiconductor, LP2995M/NOPB Datasheet - Page 6
![IC REGULATOR DDR TERM 8-SOIC](/photos/7/55/75567/lp2995m_nopb_sml.jpg)
LP2995M/NOPB
Manufacturer Part Number
LP2995M/NOPB
Description
IC REGULATOR DDR TERM 8-SOIC
Manufacturer
National Semiconductor
Datasheet
1.LP2995MRNOPB.pdf
(14 pages)
Specifications of LP2995M/NOPB
Applications
Converter, DDR
Voltage - Input
2.5 ~ 5.5 V
Number Of Outputs
1
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Primary Input Voltage
2.5V
No. Of Outputs
1
No. Of Pins
8
Output Current
1.5A
Operating Temperature Range
0°C To +125°C
Msl
MSL 1 - Unlimited
Filter Terminals
SMD
Rohs Compliant
Yes
Current Rating
1.5A
For Use With
LP2995M-EVAL - BOARD EVALUATION LP2995M
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Other names
*LP2995M
LP2995M
LP2995M
www.national.com
Block Diagram
Description
The LP2995 is a linear bus termination regulator designed to
meet the JEDEC requirements of SSTL-2 and SSTL-3. The
LP2995 is capable of sinking and sourcing current at the out-
put V
reference voltage that also tracks VDDQ / 2 is generated on
the V
SDRAM and Northbridge Chipset. V
V
range while preventing shoot through on the output stage.
Series Stub Termination Logic (SSTL) was created to im-
prove signal integrity of the data transmission across the
memory bus. This termination scheme is essential to prevent
data error from signal reflections while transmitting at high
frequencies encountered with DDR RAM. The most common
form of termination is Class II single parallel termination. This
involves using one Rs series resistor from the chipset to the
memory and one Rt termination resistor. This implementation
can be seen below in
REF
TT
REF
voltage with a tight tolerance over the entire current
, regulating the voltage to equal VDDQ / 2. A buffered
pin for providing a global reference to the DDR-
Figure
1.
TT
is designed to track the
6
Typical values for R
be changed to scale the current requirements from the
LP2995. For determination of the current requirements of
DDR-SDRAM termination please refer to the accompanying
application notes.
S
and R
FIGURE 1.
T
are 25 Ohms although these can
20039308
20039301