LP2995LQEVAL National Semiconductor, LP2995LQEVAL Datasheet
LP2995LQEVAL
Manufacturer Part Number
LP2995LQEVAL
Description
BOARD EVALUATION LP2995LQ
Manufacturer
National Semiconductor
Specifications of LP2995LQEVAL
Channels Per Ic
1 - Single
Current - Output
1.5A
Voltage - Input
2.2 ~ 5.5V
Regulator Type
Positive Fixed
Operating Temperature
0°C ~ 125°C
Board Type
Fully Populated
Utilized Ic / Part
LP2995
Lead Free Status / RoHS Status
Not applicable / Not applicable
Voltage - Output
-
© 2002 National Semiconductor Corporation
LP2995 Evaluation Board
Introduction
The LP2995 evaluation board is designed to provide the
design engineer with a fully functional prototype system in
which to evaluate the LP2995 in both a static environment
and with a complete memory system. There are two versions
of the board, while identical in functionality they differ in the
package implemented, either an SO-8 or LLP-16 LP2995 is
Application
The LP2995 evaluation board can be used immediately in
either a static test environment to check functionality or in a
memory termination scheme on a motherboard. In either
implementation the following steps should be taken to en-
sure correct operation.
1. Connect leads from the evaluation board. The board
2. V
3. Two GND pads have been provided for ease of use.
Name
layout has been designed to allow banana jack sockets
to be directly soldered.
pad connects both the AV
LP2995.
Either is sufficient for grounding of the board.
U1
C1
C2
C3
C4
C5
IN
should be connected to a 2.5V power supply. This
330µF
330µF
Value
0.1µF
68µF
LP2995 DDR Linear Regulator
1206 Ceramic Capacitor X7R 25V
6.3V Electrolytic Radial FC Series
6.3V Electrolytic Radial FC Series
Not Connected
6.3V Electrolytic Radial FC series
IN
and PV
AN200491
Description
IN
TABLE 1. Bill Of Materials
pins of the
FIGURE 1. Schematic
National Semiconductor
Application Note 1241
Chance Dunlap
August 2002
used. This application note contains information regarding
the evaluation board. For more information regarding the
LP2995 please refer to the datasheet.
Schematic
The following schematic was used to create the layout.
4. The V
5. The V
6. The remaining two pads are for the force and sense
erence voltage. Both V
voltage, nominally a 2.5V will be applied.
LP2995 after being bypassed by a ceramic capacitor.
This can be connected either to a multimeter for confir-
mation or directly to the memory controller and DIMMS.
leads of the V
directly to the termination plane or a multimeter if inter-
ested in verification. The output will be regulated where
the V
connection to a motherboard without suffering from large
resistance drops.
National
Semiconductor
Vishay Vitrammon
Panasonic
Panasonic
Panasonic
SENSE
DDQ
REFOUT
Manufacturer
input provides the internal divide by two ref-
leads connect to the V
pad is the output for the V
TT
output. These should be connected
REF
and V
LP2995M or LP2995LQ
VJ1206Y104KXXAT
EEU-FC0J331S
EEU-FC0J331S
EEU-FC0J680
20049101
TT
Model Number
TT
will track this internal
leads permitting the
www.national.com
REF
from the
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LP2995LQEVAL Summary of contents
Page 1
... AV and PV IN LP2995. 3. Two GND pads have been provided for ease of use. Either is sufficient for grounding of the board. © 2002 National Semiconductor Corporation National Semiconductor Application Note 1241 Chance Dunlap August 2002 used. This application note contains information regarding the evaluation board ...
Page 2
Performance The following series of scope plots shows the performance of the LP2995 evaluation board when it is subjected to various load tests. On each of the six scope plots there are two traces. The upper trace is the V ...
Page 3
Board Layout LLP Top Side LLP Bottom Side 3 20049103 20049102 www.national.com ...
Page 4
Board Layout (Continued) www.national.com SO-8 Top Side SO-8 Bottom Side 4 20049104 20049105 ...
Page 5
... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...