LP2996MR National Semiconductor, LP2996MR Datasheet - Page 12

• Manufacturer Part Number: LP2996MR
• Description: IC, REG DDR TERMINATION, SMD, PSOP8
• Manufacturer: National Semiconductor

Specifications of LP2996MR

• Primary Input Voltage: 2.5V
• Output Voltage: 1.35V
• No. Of Pins: 8
• Output Current: 1.5A
• Voltage Regulator Case Style: PSOP
• Operating Temperature Range: 0°C To +125°C
• Svhc: No SVHC (15-Dec-2010)
• Output Voltage Fixed: 1.35V
• Rohs Compliant: Yes
• No. Of Outputs: 1
• Filter Terminals: SMD
• Mounting Type: Surface Mount
• Input Voltage Primary Max: 5V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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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.
tions of recommended circuits with output curves displayed
in the Typical Performance Characteristics.
If it is not desirable to use the 1.8V rail it is possible to connect
the output stage to a 3.3V rail. Care should be taken to not
exceed the maximum junction temperature as the thermal
dissipation increases with lower V
Figure 6
and
Figure 7
FIGURE 7. SSTL-2 Implementation with higher voltage rails
TT
show several implementa-
FIGURE 9. DDR-II Termination with higher voltage rails
output voltages. For this
FIGURE 8. Recommended DDR-II Termination
Figure 6
shows
12
the recommended circuit configuration for DDR-II applica-
tions. The output stage is connected to the 1.8V rail and the
AVIN pin can be connected to either a 3.3V or 5V rail. For new
designs, the LP2997 or LP2998 is recommended for DDR-II
applications.
reason it is not recommended to power PVIN off a rail higher
than the nominal 3.3V. The advantage of this configuration is
that it has the ability to source and sink a higher maximum
continuous current.
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