LP2996M National Semiconductor, LP2996M Datasheet

IC, REG DDR TERMINATION, SMD, SO-8

LP2996M

Manufacturer Part Number
LP2996M
Description
IC, REG DDR TERMINATION, SMD, SO-8
Manufacturer
National Semiconductor
Datasheet

Specifications of LP2996M

Primary Input Voltage
2.5V
Output Voltage
1.35V
No. Of Pins
8
Output Current
1.5A
Voltage Regulator Case Style
SOIC
Operating Temperature Range
0°C To +125°C
Svhc
No SVHC (15-Dec-2010)
Output Voltage Fixed
1.35V
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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© 2011 National Semiconductor Corporation
DDR Termination Regulator
General Description
The LP2996 linear regulator is designed to meet the JEDEC
SSTL-2 specifications for termination of DDR-SDRAM. The
device contains a high-speed operational amplifier to provide
excellent response to load transients. The output stage pre-
vents shoot through while delivering 1.5A continuous current
and transient peaks up to 3A in the application as required for
DDR-SDRAM termination. The LP2996 also incorporates a
V
output as a reference for the chipset and DIMMs.
An additional feature found on the LP2996 is an active low
shutdown (SD) pin that provides Suspend To RAM (STR)
functionality. When SD is pulled low the V
state providing a high impedance output, but, V
active. A power savings advantage can be obtained in this
mode through lower quiescent current.
Typical Application Circuit
SENSE
pin to provide superior load regulation and a V
200575
TT
REF
output will tri-
will remain
REF
LP2996
Features
Applications
Source and sink current
Low output voltage offset
No external resistors required
Linear topology
Suspend to Ram (STR) functionality
Low external component count
Thermal Shutdown
Available in SO-8, PSOP-8 or LLP-16 packages
DDR-I and DDR-II Termination Voltage
SSTL-2 and SSTL-3 Termination
HSTL Termination
20057518
March 28, 2011
www.national.com

Related parts for LP2996M

LP2996M Summary of contents

Page 1

... Suspend To RAM (STR) functionality. When SD is pulled low the V state providing a high impedance output, but, V active. A power savings advantage can be obtained in this mode through lower quiescent current. Typical Application Circuit © 2011 National Semiconductor Corporation LP2996 Features ■ Source and sink current ■ ...

Page 2

... EP Ordering Information Order Number Package Type LP2996M LP2996MX LP2996MR PSOP-8 LP2996MRX PSOP-8 LP2996LQ LP2996LQX www.national.com 20057502 20057504 Name GND Ground SD Shutdown VSENSE Feedback pin for regulating V VREF Buffered internal reference voltage of V VDDQ Input for internal reference equal to V AVIN ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. AVIN to GND PVIN to GND VDDQ (Note 2) Storage Temp. Range Junction Temperature SO-8 Thermal Resistance (θ PSOP-8 Thermal Resistance (θ LLP-16 Thermal Resistance (θ ...

Page 4

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating range indicates conditions for which the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test ...

Page 5

Typical Performance Characteristics and REF DDQ 20057520 20057522 20057524 20057521 REF REF 20057523 OUT 20057525 ...

Page 6

DDQ Temperature IN Maximum Sourcing Current 2.5V, PV DDQ www.national.com 20057526 20057528 IN = 2.5V) IN 20057532 Temperature IN 20057527 Maximum Sourcing Current ...

Page 7

Maximum Sinking Current 2.5V) DDQ Maximum Sinking Current 1.8V) DDQ Block Diagram Maximum Sourcing Current DDQ 20057534 Maximum Sourcing Current DDQ 20057536 7 IN ...

Page 8

Description The LP2996 is a linear bus termination regulator designed to meet the JEDEC requirements of SSTL-2. The output, V capable of sinking and sourcing current while regulating the output voltage equal to VDDQ / 2. The output stage has ...

Page 9

Despite the fact that the LP2996 is designed to handle large transient output currents it is not capable of handling these for long durations, under all conditions. The reason ...

Page 10

Via wall thickness JA for this calculation is 0.036 mm for 1oz. Copper. FIGURE 3. LLP-16 θ Vias (4 Layer JEDEC Board)) JA Additional improvements in lowering the θ ...

Page 11

Typical Application Circuits Several different application circuits have been shown in ure 5 through Figure 14 to illustrate some of the options that are possible in configuring the LP2996. Graphs of the indi- vidual circuit performance can be found in ...

Page 12

FIGURE 7. SSTL-2 Implementation with higher voltage rails DDR-II APPLICATIONS With the separate VDDQ pin and an internal resistor divider it is possible to use the LP2996 in applications utilizing DDR- II memory. Figure 6 and Figure 7 show several ...

Page 13

LEVEL SHIFTING If standards other than SSTL-2 are required, such as SSTL-3, it may be necessary to use a different scaling factor than 0.5 times V for regulating the output voltage. Several options DDQ are available to scale the output ...

Page 14

QDR APPLICATIONS Quad data rate (QDR) applications utilize multiple channels for improved memory performance. However, this increase in bus lines has the effect of increasing the current levels re- quired for termination. The recommended approach in termi- nating multiple channels ...

Page 15

PCB Layout Considerations 1. The input capacitor for the power rail should be placed as close as possible to the PVIN pin should be connected to the V SENSE at the point where regulation is required. For motherboard ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 8-Lead Small Outline Package (M8) NS Package Number M08A 16 ...

Page 17

LLP Package (LD) NS Package Number LQA16A 8-Lead PSOP Package (PSOP-8) NS Package Number MRA08A 17 www.national.com ...

Page 18

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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